Document 850nB0ooZar4OLdKaj2qyppek

FROM GEORGE H. FARRAH ENVIRONMENTAL HEALTH LABORATORY ALCOA TECHNICAL CENTER TO INDUSTRIAL HYGIENIS April 17, 1972 PLAINTIFF'S EXHIBIT AL-1744 RE: INDUSTRIAL HYGIENE NEWSLETTER - ASBESTOS DUST EXPOSURES Mr. R. P. Carter's Newsletter dated December 23, 1971, concerning the 06HA emergency standard for asbestos has led to many requests for advice in determining compliance with the new Federal standards. This letter attempts to point out the more likely areas of exposure to asbestos dust, general reduction of worker exposures and includes sampling and analytical methods to determine if you are in compliance with any promulgated OSHA standard referring to asbestos. The principal asbestos-containing materials of concern (apart from building insulation and pipe covering) are Molten Metal Marinite (Johns-Manville), asbestos shorts and insulating block used in smelting cells and furnaces of all types. Marinite constitutes a problem from the point of delivery of sheet stock, through storage and handling, all machining operations, removal of used material, to disposal of wastes. Asbestos shorts, as currently used, may present dust problems during transfer and mixing of the dry material in preparation of mortar, and in removal of old linings. According to Mr. H.M. Short, practically all the insulating (back-up) block used in smelting cells and in all types of furnaces contains 8% asbestos. This means that the operations of removing old lining from furnaces and cells, and even the relining, can create asbestos dust exposures. Asbestos is also used in other forms, such as paper and rope, and in a variety of applications - but principally as high temperature gasket. Wherever asbestos is routinely used, and in whatever form, we must take a careful look at exposures, not only of those handling the material, but of other workers in the vicinity. As mentioned in the December 23 Newsletter, this concern applies as well to the demolition of asbestos-covered structures, pipes, etc. In starting an asbestos dust control program, the first step should be the listing of all forms and applications of asbestos-containing materials. This information should be readily available from the Process Materials List which all plants should have prepared and which they should maintain as current information. Next, all operations involving asbestos should be critically inspected. In many cases, it will not be necessary to collect samples and count fibers to recognize that concentrations are too high. If inspection of the operation shows a visible dust cloud, or if there is a layer of asbestos dust on surrounding surfaces, control measures must be instituted at once. Many of these measures are specified in the Federal Register of Tuesday, December 7, 1971; there are also some useful suggestions in the copies of Insulation Hygiene Progress Reports which were attached to the December 23, 1971, letter. Most shops in which Marinite is processed have exhaust ducts attached to lathes, table and bandsaws, routing machines, etc. Power hand tools are similarly equipped and connected to the exhaust system. Some of these do a fairly good job of capturing dust, others are of little value. To be effective, enclosures must be virtually complete, with ARD 006992 Industrial Hygienists April 17, 1972 Page 2 high capacity exhaust systems. Furthermore, exhaust systems must be connected to collection systems which meet the performance standards set forth in the Federal Register, December 7, 1971, page 23208, Section 1910.93a and pages 23242-23243, Sections 61.23 and 61.24. There should be no visible emissions from discharge of the collection system. This discharge should be to the outside and directed away from any windows that may be opened, to avoid any pos sibility of dust being blown back into the workroom. Where the collector discharge is directed against the side of a building and 1 has resulted in a readily visible brown deposit, collection efficiency may well be questioned. Assistance with your control problems can be obtained from the Pittsburgh Environmental Engineering Division. The handling of dry asbestos shorts may be avoided by purchase of this material in plastic bags equipped with hose connections which permit wetting of the contents before the bag is opened. Wet-digging of old trough and furnace linings, where this is permissible, will reduce the generation of dust. If wet removal and replacement of lining is done in the open, provision should be made for adequate clean-up, includina flushing away of fines, so that dust will not blow about as the work area dries. In all cases, clean-up must be done by means of vacuum cleaners and not by dry sweeping. Asbestos wastes should be collected and disposed of in sealed bags as required by the existing standard. In removing old furnace and cell linings, wetting the exposed surfaces to minimize dust should be employed wherever practical. Again, the Pittsburgh Environmental Engineering Division should be consulted on the practicality of exhaust from the working area, especially during lining removal. After installation of all appropriate control measures, even though there is no visible dust, an air sampling program will be necessary to determine whether respiratory protection may be discontinued. If levels of dust are above the standard permitted, the actual levels will establish the type of respiratory protection required. The emergency standard for asbestos dust published in the Federal Register of December 7, 1971, established the approved method for counting the fibers in a sample. When this level was proposed as a permanent standard in the Federal Register of January 12, 1972, (Attachment #1) some of the details of sampling were also spelled out, along with requirements for warning signs, environmental sampling, and medical examinations. Early in February, NI06H published a criteria document on asbestos dust recommending a still lower fiber count as the standard. The detailed method for sampling, counting and calculating the fiber concentrations which was contained in this document is given in Attachment #2. Attachment #3 is a copy of Q3HA Sampling Data Sheet #2 which contains additional helpful information. Regardless of the concentration which is established as the final standard, these sampling and analytical procedures will apply. ARD 006993 Industrial Hygienists April 17, 1972 Page 3 Sampling to determine worker exposures will be the responsibility of each plant and suitable equipment must be purchased, if it is not already available. The decision to evaluate samples in-house or to send them to a commercial laboratory will depend upon availability of personnel and equipment, and the volume of work anticipated. While our Environmental Health Laboratory will be equipped to make these evaluations for the Technical Center, the anticipated demand would be too great if we were to offer our services, company-wide. Collection of samples is most conveniently done with pre-loaded filters and a small, battery powered pump of about 2 liters per minute capacity, such as the following: Pre-loaded Filters Millipore Field Monitors, Cat. No. MAWP 037 AO Price per carton of 50 (available from Millipore Corp., Bedford, Mass. 01730) $30.00 Battery Powered Pump 1. MSA Portable Pump Assembly, Model G, Cat. No. 456058 (Requires MSA Battery Charger Assembly, Model G Pump, Cat. No. 456059) $160.00 $ 40.00 Mine Safety Appliances Co. 201 North Braddock Avenue Pittsburgh, Pa. 15208 or i 2. NEI Micronair Personal Air Sampler, Cat. No. 3900-10, complete with Nicad battery and charger $195.00 National Environmental Instruments, Inc. 1865 Post Road Warwick, R.I. 02888 Counting the fibers collected on the filters requires the use of a microscope equipped for phase contrast illumination, and a good quality microscope lamp, preferably one capable of providing Ktthler illumina tion. To adape a given microscope for this work, the manufacturer should be consulted because the optical parts of different manufacturers may not be interchangeable. A Bausch and Lomb CTA-10 conventional microscope would require these accessories: special condenser, telescope, filters, phase annulus, and objective totaling $344.00. A suitable microscope lamp may cost about $100.00. If a microscope is to be purchased especially for this work, consideration should be given to the American Optical N51MP Series 50 Phase Teaching Microscope with 4X scanning objective, 10X phase and 45X phase objectives, and built-in ARD 006994 Industrial Hygienists April 17, 1972 Page 4 illuminator. It appears to be a satisfactory instrument and sells for $448.00, without carrying case. Examination of Molten Metal Marinite dust by phase contrast and b' bright field illumination showed little difference since the fibers are stained brown - probably by iron oxide - due to heat treatment ?fliich Marinite receives to convert it to the Molten Metal type. This was confirmed by discussion with the Product Manager for Marinite, Johns-Manvilie Corporation, who stated that the only type of asbestos used in Molten Metal Marinite is the brownish amosite. At this time, it appears that exposures to Molten Metal Marinite fibers can be evaluated by bright field counting with a conventional microscope. Therefore, this can be used to get preliminary data on Marinite dust concentrations, until equipment for the standard method required by CSKA is obtained. This is not the case for other forms of asbestos, which will require phase contrast microscopy at the outset. Sending samples to commercial laboratories for counting may be advantageous in some cases, but may also present difficulties in locating laboratories qualified to perform this service. Walter C. McCrone Associates, Inc., Chicago, 111., is probably the best known organization in the field of consultative microscopy and is preparing to offer this service at a charge of $25.00 to $30.00 per sample. Mr. Robert P. Carter has supplied a corrected list for the respirators approved by the Bureau of Mines to replace that attached to his December 23, 1971, letter re "Emergency Standard for Exposure to Asbestos Dust." A copy of this corrected list is Attachment #4. If after reviewing this letter and all attached materials you have questions or special problems concerning methods of sampling and counting, please contact me. GEORGE H. FARRAH GHFrmh Attachments cc, no att: Chairmen, Environmental Health Steering Committees V. W. Rieke, Pgh. - 2 L. V. Cralley/T. B. Bonney, Pgh. - 7 W, B. Garyotis, Pgh. - 2 R. H. Watson, Pgh. - 7 R. B. Kempton, Rea Magnet ARD 006995 DISTRIBUTION Arkansas Badin Chillicothe Cleveland Cressona Corona Davenport Lafayette Lancaster Lebanon Logans Ferry Marsha 11 Massena Mobile Pt. Comfort Richmond Rockdale Tennessee Tifton Vancouver Vernon Warrick Wenatchee INDUSTRIAI HYGIENIST:-, J.L. 'andenberg Earle Morgan J. bchachtele i_. # L * Grubb E.J. Schafer R.H. Allen K.W. Wi11iams L.S. Chambers H.E. Hillstrom R. .Andrew W.D. Helmick J.W. Warnock w.s. Barr Albert Steele C.F. Scott R.E. Beachem A.G. Clayton J.C. Veryho UL. Haisch H.L. Chandler R.L. Parsons J. A. Thornpson EHSC CHAIRMEN J.W. Wells K.C. Hinkle J.J. Thimons L.J. O'Connell N. O. Kraft R.H. Allen d.l. Schaffer J.B. Dolan R.S. H owe11 R. Andrew J. Hicks L.E. Norris R.W. Knapp R.V. Newsome C.L. Green R.H. Cunneen G.W. Hutton H.W. Brooks H.E. Chandler P.F. Woodward J. R,. Jones R.J. Knox J.A. Thompson ARD 006996 Attachment #1 466 PROPOSED RULE MAKING regulated by this order than from other (2) Inventories at the beginning and order plants during the month. end of the month of the following DEPARTMENT OF LABOR Proposal No. 9. Amend 9 1036 42(b) (2) products: to read "Other source milk In bulk fluid (I) Fluid milk products; and Occupational Safety and Health form exclusive of that specified in (II) Products listed in 9 1036.41(b) (1), AdmiwUtration 9 1036.41(c) (6)". except those received in packaged form Proposal No. 10. Amend I 1036.43 In from another plant, showing separately [29 CFR Part 1910] terplant movements. such Inventories in bulk form and in STANDARD FOR EXPOSURE TO Add in 9 1036.43(c) (3) (1). (ID. and (111), the words "`of bottling grade milk" after the phrase "constitute regular sources of supply". Proposed by Borden, Inc.: Proposal No. 11. Add to ( 1036.45 a pro vision to read as follows: Subtract from the remaining pounds of skim milk in Class n, the pounds of skim milk in other source milk (except that received in the form of a fluid milk product) that Is added to, or used to pro duce, any product specified in 9 1036.41 (b). Proposed by Town and Country Dairy, Garvins Dairy. Sweet Home Dairy, and Halms Modem Dairy: Proposal No. 12. Amend order No. 36 to provide that the following counties in the State of Ohio: Belmont, Jefferson, Harrison, Monroe, and part of Guernsey now in the marketing area; plus the West Virginia counties of Hancock, Brooke, Ohio, and Marshall be Included in Zone 1 as defined by the proposal of Milk, Inc. (Proposal No. 1); or alterna tively that the above dairies are to be put in the present Cleveland-Erie District rather than the Pittsburgh District. Proposed by the Dairy Division, Con sumer and Marketing Service: Proposal No. 13. Revise 9 1036.11(a) packaged form; Proposal No. IS. Revise 9 1036.41(c) (6) (vli) to read as follows: 1036.41 Classes of utilisation. (c) * * * (6) * * * (vil) Less 1.5 percent of the quantity of bulk fluid milk products and bulk cream transferred to other plants which does not exceed such quantity to which per centages are applied in subdivisions (1), (11), (lv>, (v) and (vl) of this subpara graph; Proposal No. 17. Make whatever changes are necessary in the order to eliminate the possibility of a handler be ing charged under the order at the Class I price for milk that already has been classified and priced as Class I milk un der a Federal order. Proposal No. IS. Reposition, for clari fication of the order, the provisions which establish that the Class I price for other source milk when adjusted for location of the shipping plant, shall not be less than the Class HI price. Proposal No. 19. Make whatever ASBESTOS DUST Notice of Proposed Rule Making Section 6(c) of the Williams-Steiger Occupational Safety and Health Act of 1970 (84 Stat. 1596 ; 29 UJS.C. 655) pro vides that upon the publication of an emergency temporary standard in the Federal Register the Secretary of Labor shall commence a rule making proceed ing In accordance with section 6(b) of the Act, and that the emergency standard as published shall also serve as a proposed rule for the proceeding. An emergency temporary standard concern ing exposure to asbestos dust was pub lished in the Federal Register on De cember 7, 1971 (36 F-R. 23207). Accord ingly, pursuant to section 6 (b) and (c) of the Wflllams-Steiger Occupational Safety and Health Act of 1970 (84 Stat. 1593, 1596; 29 U.S.C. 655), 29 CFR 1910.4, and Secretary of Labor's Order No. 12-71 (36 F.R. 8754). it is hereby proposed to amend 29 CFR Part 1910 as set forth below. The proposals Include the emergency temporary standard and additional proposed rules on subsidiary issues. Interested persons are Invited to sub mit, both orally and in writing, data, (1) to read as follows: 1036.11 Pool plant. (a) A distributing plant that has: changes are necessary In the order to provide for a uniform "equivalent price" section to read as follows: 1036.54 Equivalent price. views, and arguments concerning these proposals. Written data, views, and arguments may be mailed to the Office of Safety and Health Standards. Room 305, 400 First (1) Route disposition except filled If for any reason a price or pricing Street NW, Washington. DC 20210, with milk, during the month of not less than component required for this part for in 30 days after the publication of this 50 percent (40 percent for each month of computing class prices or for other pur notice in the Federal Register. The data, April through August) of the total re ceipts of fluid milk products, except filled milk, that are approved by a duly poses is not available In the manner de scribed in this part, the market admin istrator shall use a price or pricing com ponent determined by the Secretary to views, and arguments will be available for public inspection and copying at the Office of Safety and Health Standards, except as to matters the disclosure of constituted health authority for fluid be equivalent to the price or pricing com which is prohibited by law. consumption and that are physically re ponent that is required. Oral data, views, and arguments will ceived at such plant or diverted as pro ducer milk pursuant to } 1036.16 to a supply plant qualified under paragraph (b) or (c) of this section or a nonpool plant; and Proposal No. 14. Review the provisions of 9 1036.11(c) to determine whether Proposal No. 20. Make such changes as may be necessary to make the entire marketing agreement and the order con form with any amendments thereto that may result from this hearing. Copies of this notice of hearing and the order may be procured from the Market Administrator, 7503 Brookpark Road. Cleveland, OH 44129 or from the Hear be received by Hearing Examiner Arthur Goldberg, at a hearing beginning at 10 a.m. on March 14, 1972, in Conference Room B, Departmental Auditorium, 14th Street and Constitution Avenue NW,, Washington, DC. Persons desiring to ap pear at the hearing must file with the Office of Safety and Health Standards a notice of intention to appear, no later than March 3, 1972. The notice must they should apply only to plants primar ing Clerk, Room 112-A, Administration state the name and address of the per ily engaged In the transfer of milk to Building, UB. Department of Agricul son to appear the capacity in which he distributing plants qualified under para graph (a) of this section. ture, Washington, D.C. 20250 or may be there Inspected. will appear, and the approximate amount of time required for his presentation. The notice must also include, or be ac Proposal No. IS. Revise 9 1036.30(a) (2) Signed at Washington, D C., on Janu companied by. a statement of the posi to read as follows: ary 7, 1972. tion to be taken with regard to the pro 1036.30 Report of receipt* and lion. (> John C. Blum, Deputy Administrator. Regulatory Programs. rra Doe. 73-468 Piled 1-11-73:8:49 mj posed rules. The oral proceedings shall be reported verbatim, and transcripts shall be avail able for inspection to any interested per son on such conditions as the presiding HWAl 880)STU, VOL 37, NO. 7--WIDNCSDAT, JANUA8Y 13, 1972 ARD 006997 PROPOSED RULE MAKING 467 hearing examiner may prescribe. The hearing examiner shall regulate the course of the oral proceedings, dispose of procedural requests, objections, and similar matters, regulate the conduct of those present at the hearing by appro priate means, and shall exclude to the extent practicable irrelevant, immaterial, and unduly repetitious data or argu ments. The hearing examiner shall have discretion to keep the record of the hear ing open for a reasonable, stated time to receive written recommendations, and additional data, views, and arguments from any person who has participated in the oral proceeding Upon completion of the oral proceedings, the transcript thereof, together with written submis sions on the proposed rules, exhibits filed during the hearing, and any posthearing data, views, arguments, and recommen dations shall be certified by the hearing examiner to the Assistant Secretary of Labor for Occupational Safety and Health for his decision The Assistant Secretary may adopt the proposals with or without changes, or determine not to issue a rule. Under the authority of section 6(b) (1) and section 7(b) of the Act, the Assist ant Secretary of Labor for Occupational Safety and Health will request the recommendations of an advisory com mittee with regard to the proposed rules. The committee will be provided with copies of these proposals, together with all pertinent factual information which is, or may become, available to the As sistant Secretary, including any infor mation submitted by the National Insti tute for Occupational Safety and Health. The advisory committee will be asked to submit to the Assistant Secre tary written recommendations regarding these proposed rules within 45 days after the publication of this notice. The recommendations will be available for public inspection and copying. No other advisory committee will be consulted with regard to these proposed rules. Part 1910 of Title 29 of the Code of Federal Regulations is proposed to be amended as follows: 1910.93 [Amended] 1. Table G-3 in 5 1910.93 (36 F.R. 15104, August 13, 1971) is proposed to be amended by deleting the following: A*beetoe--12 fibers per milliliter greater than 6 microns in length or 2 Mppcf. 20 Twg /M1 TremoUte * 5 Mppcf. If so amended, Table G-3 would read as follows: Table Q-3--Mjnerai Dusts Substance Mppcf Mg/M* Silica: Crystalline: Quartz (respirable'............... 260 1 lOrng/M* * %8lOj+6 %8K>r4-2 Quartz (total dust)...................................... 30mg'rM| Crlstoballte: Use ^ the value calculated from the count or mass formulae for quarts. TridymJte: Use H the value calculated from the for* mulae for quartz. ,%8IO,+2 Subetaace Mppcf Mg/M Amorphous. Including natural diatomaccous earth............. BUlcdhe (less than 1% crys- laline silica): Mica.......................................... Soapstone....................... . Talc .. Portland cement Graphite (natural' Coal dust (respirable fraction less than fl% 8l()i For more than 6^ 810*. Inert or Nuisance Dual. Respirable fraction... Total dust___ 20 SOmg/M* %S10| 20 20 20 60 16 2.4nig/M* or 10m g/M* %SiOj+2 16 6rag/M* 60 16mg/M* Note Conversion factora- mppcfX36.3= million particles per cubic meter = particles per c c. f Millions of particles per cubic foot of air, based on Lmpinper samples counted by Ught-fteld technics. > The percentage of crystalline silica la the formula ts the amount determined from air-borne samples, eicept tn those instances In which other methods havebeen shown to be applicable. i As determined by the membrane filter method at 430 X phase contrast magnification. Both concentration and percent quartz fOT the application of this limit are to be determined from the fraction passing a size-selector with the following characteristics: Aerodynamic diameter (unit density sphere) Percent passing selector 2 00 2.6 76 3.5 60 6.0 26 10 0 The measurements under tbis note refer to the use of an A EC Instrument. If the respirable fraction of coal dust is determined with a MRE the figure corresponding to that of 2.4 Mg/M* in the table for coal dust is 4.6 Mg/Mi 2. A new S 1910.93a is proposed to be added to Part 1910, reading as follows: 1910.93a Asbestos duL (a) 8-hour time-weighted average. The 8-hour time-weighted average air borne concentration of asbestos dust to which employees are exposed shall not exceed 5 fibers longer than 5 microns per milliliter, as determined by the mem brane filter method at 400-450 x (mag nification) (4 millimeter objective) phase contrast illumination. Concentra tions above 5 fibers per milliliter, but not to exceed 10 fibers per milliliter, may be permitted up to a total of 15 minutes in an hour, but for not more than 5 hours In an 8-hour day. (b) Methods of compliance--(1) Engineering methods. Engineering methods, such as, but not limited to, en closure, vacuum sweeping, and local ex haust ventilation, shall be used to meet the exposure limits prescribed in para graph (a) of this section. Where such engineering methods are not feasible, or do not reduce the concentrations below the limits prescribed in paragraph (a) of this section, respiratory protective de vices shall be provided and used in ac cordance with subparagraph (2) of this paragraph. (2) Other methods, (i) When the limits of exposure to asbestos dust pre scribed in paragraph (a) of this section are exceeded, and engineering controls required by subparagraph (1) of this paragraph are not feasible or do not re duce the concentration of asbestos dust below the limits prescribed in paragraph (a) of this section, the employer shall require the use of respiratory protective devices. The selection of respiratory pro tective devices shall be limited jo those specified in paragraph (c) of this section. (ii> The employer shall require that each employee test his respiratory pro tective device before each use in order to insure a proper fit according to the manufacturer's instructions. The em ployer shall further provide for effective training or supervision of employees in the testing of respiratory protective de vices for fit before their use. (c) Allowable respirators. (1) When the 8-hour time-weighted average con centration of asbestos dust is projected to exceed 5 fibers longer than 5 microns per milliliter, but not to exceed 25 such fibers, and when a concentration over a period of 15 minutes exceeds 10 fibers longer than 5 microns per milliliter, but does not exceed 50 such fibers, a re usable or single use filter type respira tor, operating with negative pressure during the inhalation phase of breath ing, approyed by the U.S. Bureau of Mines under the provisions of 30 CFR Part 14 (Bureau of Mines Schedule 21B>, shall be used. <2' When the 8-hour time-weighted average concentration of asbestos dust is projected to exceed 25 fibers longer than 5 microns per milliliter but not to exceed 250 such fibers, and when a con centration over a period of 15 minutes exceeds 50 fibers longer than 5 microns per milliliter but does not exceed 500 such fibers, a powered filter positive pressure respirator approved by the U.S. Bureau of Mines under the provisions of 30 CFR Part 14 'Bureau of Mines Sched ule 2IB) shall be used. '3) When the 8-hour time-weighted average concentration of asbestos dust is projected to exceed 250 fibers longer than 5 microns per milliliter a type "C" positive pressure supplied-air respirator approved by the U.S. Bureau of Mines under the provisions of 30 CFR Part 12 (Bureau of Mines Schedule 19B) shall be used. (4) The employer shall establish a respirator program in accordance with the requirements of American National Standard Practice for Respiratory Pro tection Z88.2--1969. (5) The respirators provided each em ployee shall be properly inspected, cleaned, repaired, and stored. (d) Particular operations and prod ucts. (1) When an employer has employ ees who are exposed to asbestos dust re sulting from the operations or the use of tools described in the remaining subparagraphs of this paragraph <d), the employer shall comply with the require ments of this paragraph. The require ments of this paragraph shall apply at all times, and, in addition, the require ments of paragraph (b) of this section may also apply, according to the terms thereof. (2) AH hand- or power-operated tools which produce asbestos dust such as. but not limited to, saws, scorers, abrasive FEDERAL REGISTER, VOL. 37, NO. 7--WEDNESDAY, JANUARY 12, 1972 ARD 006998 468 PROPOSED RULE MAKING wheels, and drills, shall be provided with local exhaust ventilation ana dust col lectors in accordance with the American National Standard Fundamentals Gov erning the Design and Operation of Ical Exhaust Systems; ANSI Z9 2--1971. (3) Employees exposed to the spray ing of asbestos, to the demolition of pipes, structures, or equipment covered or Insulated with asbestos, or to the demolition of insulating strippings, shall be provided with respiratory protective devices in accordance with paragraph (c) (3) of this section (4) Asbestos cement, mortar, coatings, grout, and plaster shall be mixed in closed bags or other closed containers. (5) Asbestos waste and scrap shall be collected and disposed of in sealed bags or other closed containers (6) Accumulation of asbestos dust shall be removed, as soon as practicable, and only by vacuum cleaners. (e1 * 3Warning signs--<1> Posting. Warning signs shall be provided and displayed at each location where asbestos dust hazards are present. Signs shall be P06ted at least 50 feet in each direction from the location where the hazard is present, and at intervals of not more than 100 feet along each edge of the area where the hazard is present. (2) Sign specifications. The warning signs shall conform to the requirements for 20" x 14" vertical format signs speci fied in S 1910.145(d) (2>. and to this par agraph. The signs shall display the fol lowing legend in the white panel, with letter sizes and styles of a visibility at least equal to that specified in the nota tion in the following column to the right; Legend: Asbestos ............ Dust Hazard------ Follow these............. . Safety and Health Rules. 1. Avoid breathing dust. 3. Wear your respirator. 3. Do not remain in area unless youT work requires it. Asbestos dust may cause asbestosls, a severe lung disease, and Ls implicated In the development of certain cancers. Con trol of exposure to asbestoe dust helps protect against these hazards. Notation 1" Sans Serif Gothic or Block. 44 ' Sans Serif Gothic or Block ',4 Gothic 34 Sans Seril Gothic or Block 4'' Gothic `4 Gothic l4 '' Goth ic 14 polm Gothic. (3) Spacing. Spacing between lines shall be at least equal to the height of the upper of any two lines, except that the spacing between "Following these" and "Safety and Health Rules" shall be at least (f) Monitoring--<1) Personal. Em ployees engaged in the particular opera tions or using the particular tools speci fied in paragraph (d) of this section, or exposed to concentrations of asbestos dust in exoeES of the limits specified in paragraph tc)(3> of this section shall be monitored in accordance with this paragraph. (i) Method. Dust sample' shall be col lected from within the normal breathing zone of the employees in their normal working posture Employees wearing res piratory protective devices shall have the sample taken from a point located on the exterior of the respirator facepiece. tiii Procedure The sampling proce dure shall be such as to permit the de terminations required hy paragraph <ai of this section (iiii Sampling nuration The sampling duration shall be for a period of not less than 15 consecutive minutes civ Sa<ph'i,- frequency Sampling periods shall be oi such number and pattern as to represent accurately the exposure of the employees over their working period Environmental. En-oronmental monitoring shall be conducted in all areas in which employees are exposed to concentrations of asbestoe dust in excess of the limits specified in paragraph (a) of this section <i) Method Asbestos dust samples shall be collected from areas which are representative of the concentration of airborne asbestos dust which may reach the breathing zone of exposed employees. (iii Procedure Sampling procedure shall be such as to permit the determina tions required by paragraph 'a' of this section. iiii' Sampling duration. Sampling du ration shall be for a period of not leas than 15 consecutive minutes. rivi Sampling frequency. Sampling periods shall be of such number and pattern as to represent accurately the exposure of the employees over their working period igi Medical examinations The em ployer shall provide, or make available at his cost, appropriate medical exami nations on a periodic basis to any em ployee who is exposed to asbestos dust in excess of the limits specified in para graph i a) of this section. fhi Records. 1 > Every employer shall maintain records of the personal and environmental monitoring, and of the medical examinations, required by para graphs (f) and <g> of this section. Such records shall be maintained for at least 20 years. (2> The records of monitoring shall be made available for inspection and copying to the Secretary of Labor and to his designated representatives. '3' The records of medical examina tions shall be made available only to the Secretary of Labor, to the Secretary of Health. Education and Welfare, to desig nated representatives of either of them, and, at the request of the employee or former employee examined, to his physician. 3. A new J 1910 19 is proposed to be added to Subpart B, reading as follows: 1910.19 Ashe-los dust. Section 1910,93a shah apply to the ex posure of every employee to asbestos dust in every employment and place of em ployment covered by S 1910.12, 1910.13, 1810.14. 1910 15. or 1910 16 of this Sub part B. In lieu of any different standard on exposure to asbestos dust which would otherwo.se be applicable by virtue of any of those .sections (Sec. 8. 84 Stat 1693 . 29 U S C 656 39 CFR 1910.4; Secretary of Labor's Order No 12-71 38F.R. 8784) Signed at Washington D C'., this 6th day of January 1972. G C Guenther. Asw tant Secretary of Labor ! FR Dor 72 402 Filed I 11 72 8 46 am | DEPARTMENT OF HEALTH, EDUCATION, AND WELFARE Food and Drug Administration t 21 CFR Part 19 1 CERTAIN CHEESES Proposed Identity Standards Regarding Labeling Requirements Notice is given that a petition has been filed by the National Cheese Institute. Inc.. 110 North Franklin Street, Chicago. HI. 60606. proposing that identity stand ards for certain specified cheeses be amended to require that il) the full name of the food appear on the principal display panel of the label m type of uni form size, stylp and color 2' wherever any word or statement emphasizing the name of any ingredient appears on the label (other than in circumstances de scribed below so conspicuously as to Le easily seen under customary conditions of purchase, the full name of the food immediateh and conspicuously precedes or follows such word or statement in type of at least the same size as the type of such word or statement and <3> op tional ingredients be listed conspicuously, either on the principal display panel of the label or on a single appropriate in formation panei in accordance with specifications that are consistent with similar specifications for many other food products Accordingly ,t is proposed that Pari 19 be amendea 1 In 5 19 750 f i by revising subpara graph 161 and adding subparagraphs <1 and 181. as follows 19.750 Pasteurized process cheese: identity; label statement of optional ingredients. * * if, ' ' * >6' The fill, name of the food shall appear on the principal display panel of the label in type of uniform size, style, and color (71 Wherever any word or statement emphasizing the name of any ingredient appeai-s on the label 'other than as speci fied in subpaiagraph 8 of this para graph) so conspicuously as to be easily seen under customary conditions of pur chase, the full name of the food shall FEDERAL REGISTER, VOL. 37, NO. 7--WEDNESDAY, JANUARY 12, 1972 ARD 006999 MEASUREMENT OF ASBEST06 FIBERS Attachment #2 The sample should be collected on a 37-millimetcr Millipore type AA* filter mounted in an open-face filter holder. The holder should be fastened to the worker's lapel and air drawn through the filter by means of a battery-powered personal sampler pump similar to those approved by NIOSH under the provisions of 30 CFR 74. The filters are contained in plastic filter holders and are supported on pads which also aid in controlling the distribution of air through the filter. To yield a more uniform sample deposit, the filter-holder face-caps should be removed. Sampling flow rates from 1.0 liter per minute (1pm) up to the maximum flow rate of the personal sampler, pump (usually not over 2.5 1pm) and sampling time from 15 minutes to eight hours are acceptable provided the following restraints are considered: (a) In order to obtain an accurate estimate of the number of fibers the statistical error resulting from the random distribution of the fibers must be kept to an acceptably low level. Since fiber counts follow a Poisson distribu tion, a count of 100 fibers in a sample would have a standard deviation of lUU or 10 fibers or + 10Z. Thus the 95% confidence limits would be approximately 2 standard deviations or + 20%. Since the 37 mm filter has an effectlve collecting area of 855 mm2 and the projected field 2 area of the Porton reticle is 0.005 mm , each field rep resents 1/171000 of the sample. Based on this ratio the following number of fields must be counted to measure the various limits in various sampling times: Mention of commercial products does not constitute endorsement by the Public Health Service or U. S. Department of Health, Education and Welfare. VI1I-4 ARD 007000 Sampling Time Minutes___ 10 15 30 90 90 240 240 480 Flow Rate lpm 2 2 2 1 2 1 2 1 Number of Fields for 100 Fibers 0.2 fibers/ml 2.0 fibers/ml 10 fibers/ml 4350 2860 1430 1000 500 260 180 180 435 286 143 100 50 26 18 18 91 58 29 20 10 7 4 4 <b) Do not count a field containing over 20 fibers because In addition to the fibers being counted, there are also present a number of grains, which interfere with the accuracy of the count. Based on these restraints, i.e., number of fields to be counted and maximum number of fibers per field, acceptable sampling parameters for the various limits are underlined In the above table. The following conclusions may be drawn from this analysis: (1) The short-term limit should be for a period of at least 15 minutes and preferably 30 minutes. (2) The 2.0 fiber/cc limit may be evaluated over periods of from 90 to 480 minutes. As many fields as required to yield at least 100 fibers should be counted. In general the minimum number of fields should be 20 and the maximum 100. Mounting Sample The mounting medium used in this method is prepared by dissolving 0.05 g of membrane filter per ml of 1:1 solution of dimethyl phthalate VIII-5 ARD 007001 end diethyl oxalate. The index of refraction of the medium thus prepared Is KD * 1.47. To prepare a sample for microscopic examination, a drop of the mounting medium is placed on a freshly cleaned, standard (25 mm X 75 urn), microscopic slide. A wedge-shaped piece with arc length of about 1 cm is excised from the filter with a scalpel and forceps and placed dust-side-up on the drop of mounting solution. A No. 1-1/2 coverslip, carefully clcaied /' 'ri\ with lens tissue, is placed over the filter wedge. Slight pressure on the coverslip achieves contact between it and the mounting medium. The sample may be examined as soon as the mount is transparent. The optical homogeneity of the resulting mount is nearly perfect, with only a slight background granularity under phase contrast, which disappears within one day. The sample should be counted within two days after mounting. Evaluation The filter samples mounted in the manner previously described are evaluated in terms of the concentration of asbestos fibers greater than 5 urn in length. A microscope equipped with phase-contrast optics and a 4-mm "high-dry" achromatic objective is suitable for this deter mination. 10X eyepieces, one of which contains a Forton or other suitable reticle at the level-of the field-limiting diaphragm, should be used. The left half of the Porton reticle field serves to define tile counting area of the field. Twenty fields located at random on the sample are counted and total asbestos fibers longer than 5 um are recorded. Any particle having an aspect ratio of three or greater is considered a fiber. VXII-5" ARD 007002 The following formulae are used to 'determine the number of fibers/nl: (1) Filt er area (mm2) Field area (mm^) K (2) Average net count X K " fibers/ml Air volume sampled (ml) For example, assume the following: area of the filter used was . 855 mm^i counting area of one field under the Porton reticle was 0.005 mm2; average net count per field of 20 fields was 10 fibers; and sample was collected at 2 liters per minute for 90 minutes: Then: 855mm2 - 171,000 (K) 0.005 mm2 10 fibers x 171,000 - 9.5 fibers/ml 2,000 ml/min x 90 min Calibration of Personal Sampler The accuracy of an analysis can be no greater than the accuracy of the volume of air which is measured. Therefore, the accurate calibration of a sampling device is essential to the correct interpretation of an instru ment's Indication. The frequency of calibration is somewhat dependent on the use, care, and handling to which the pump is subjected. Pumps should be calibrated if they have been subjected to misuse or if they have just been repaired or received from a manufacturer. If hard usage is given the Instrument, more frequent calibration may be necessary. Ordinarily, pumps should be calibrated in the laboratory both before they are used in the field and after they have been used to collect a large number of field samples. The accuracy of calibration is dependent on the type of instrument used as a reference. The choice of calibra tion instrument will depend largely upon where the calibration is to be performed. For laboratory testing, a 1-liter burette or wet-test meter should be used. In the field, a rotameter is the most convenient VIII-7 ARD 007003 Instrument used. The actual set-up will be the same for all of these Instruments. The calibration instrument will be connected in sequence, to the filter unit which will be followed by the personal sampler pump. In this way, the calibration instrument will be at atmospheric pressure. Connections between units can be made using the same type of tubing used in the personal sampling unit. Each pump must be calibrated separately for each type of filter used,' if, for example, it has been decided to use a filter with a different pore size. The burette should be set up eo that the flow is toward the narrow end of the unit. Care must be exercised in the assembly procedure to insure adequate seals at the joints and that the length of connecting tubing be kept at a minimum. Calibration should be done under the same conditions of pressure, temperature and density as will be encountered. The rotameter should be used only in the field as a check if the diaphragm or piston pumps are not equipped with pulsation dampeners. The pulsating flow resulting from these type pumps causes the rotameter to give results which are not as accurate as that obtained with a burette or wet-test meter. Calibration can be accomplished with any of the other standard calibrating instruments, such as spirometer, Marriott's bottle, or drygas meter. The burette and wet-test meter were selected because of their accuracy,, availability, and ease of operation. Method based on a modification of the mejnbrane filter method described by Edwards & Lynch "The Measurement of exposure to Airborne Mineral Fibers" Presented at the American Ind. Hyg. Conference, Denver 1969* VTII-8 ARD 007004 Attachment #3 1 8330 OSHA SAMPLING DATA SHEETS FOR FIVE TOXIC SUBSTANCES RaEASED Back reference*: f 1071; 6647.93; 0647.93a. The Occupational Safety and Health Administration has released sampling data sheets for the five toxic sub stances on which its "Target Health Hazards" program will focus. The data sheets cover sampling equip ment and procedures for carbon mon oxide, asbestos, crystalline silica, lead and its inorganic compounds (except lead arsenate), and raw cotton dust. Criteria for violations of employee exposure to excessive concentrations of each substance are also described. The sampling data sheets are repro duced below. 8-hour time-weighted average*.- S fibers per milliliter greater than S microns in length. Excursion limit*: 10 fibers per milliliter, up to IS minutes in an hour for up to 5 hours per 8-hour day. Unprotected or improperly protected worker exposures Analytical Method: Fibers counted at 400-450 magnification, using phase contrast illumination, with sample mounted in high-viscosity solution of membrane filter material. Sampling Equipment: Fersonal sampling pump plus Millipore type AA filter (37mm, 0.8 , pore size). Face cap is removed and filter used open face during sampling. Sampling rate: 2 1/m. Sample Size: Minimum period of 15 minutes for evalua tion of excursion limit. Several samples of up to 4 hours for evaluation of 8-hour average. Samples with a visible deposit may be too heavy to count. Compare with a clean filter. Heavy concentrations of visible dust in the air (100 to 500 fibers/ml) may require short sampling periods of only 5 minutes, or less. Blanks: With each batch of samples submit two fil ters which are subjected to exactly the same handling as for the samples except that no air is drawn through them. Label these as blanks. Shipping: The cassettes in which the samples are col lected should be shipped in a suitable con tainer, designed to prevent damage in transit. Imminent Danger Situations: Generally not applicable. OSHA SAMPLING DATA SHEET #2 Substance: Asbestos. Standard: 29 CFR 1910.93a(a) of December 7, 1971 Serious Violation: 5.1 or more fibers per ml, greater than 5 in length, for an unprotected or improperly protected worker, for an 8-hour timeweighted average, except for certain proven excursions as noted in the emergency stand ard, which may raise the 8-hour timeweighted average to 5.8 fibers per ml. Nonserious Violation: Not applicable. De Minimis Violation: Not applicable. 1 8330 1972, Commerce Clearing House, Inc. ARD 007005 CORRECTED LIST Attachment #4 RESPIRATORS APPROVED BY THE U.S. BUREAU OF MINES UNDER SCHFDULE 2IB AO Safeline MSA R8100 with R100 filter R8156 with R156 filter R5056 and R6056 with R56 filters 5550 with 5950 filter 5556 with 5956 filter 5241 with 5971 filter 96000 with 96042 filter (This identical filter available as Cat. No. 96077 package of 5 filters and Cat. No. 96106 package of 50 filters) 10-86431 with Type S filter RESPIRATORS APPROVED BY THE U.S. BUREAU OF MINES UNDER SCHEDULE 19B Willson GA2H, GAHS, GAHW, TAJ Acme 4615-1, 4616-1, 4654 MSA ,rLead-Foe (helmet)," Pulmosan HA-99 and AL-180 AO R6099 Scott 6380DP Firewel U.S. Divers SurvivAir 9011-02 ARD 007006 ^3 FROM THOMAS B. BONNEY*^ W. N. DAWSON, M. D. R. H. WATSON PITTSBURGH OFFICE TO INDUSTRIAL HYGIENISTS PLANT PHYSICIANS SAFETY DERECTORS July 1, 1972 RE: OSHA STANDARD FOR EXPOSURE TO ASBESTOS DUST__________ Attached is a copy of the latest amendment to Sec. 1910.93 related to asbestos dust exposures. The asbestos standard becomes effective July 7* 1972. Until then, the temporary emergency standard remains in effect. As you look over the requirements of this amendment, you will be impressed that its overall effect, regardless of intent, must be to discourage the use of asbestos and materials containing it. We urge you to read closely the provisions of the permanent asbestos standard. To impress upon you its wide scope and the significant demands that will be made of plant personnel, highlights of the standard are given below. Permissible Exposures. Until July 1, 1976, an employee's eight-hour, timeweighted average exposure concentration to asbestos fibers longer than five microns must not exceed five fibers per cubic centimeter of air. In addition, the employee may not be exposed to a concentration in excess of 10 such fibers per cc, regardless of the brevity of exposure. After July 1, 1976, the permissible time-weighted average concentration is reduced to two fibers per cc. The ceiling concentration will remain the same. We point out that the equivalent concentration of two fibers per cc in terms of millions of particles per cubic foot is 0.06 mppcf. In rural areas, the normal concentration range of dust in ambient air is oT^-0.5 mppcf. Using this comparison it is easy to see that a restriction to two fibers per cc means, for all practical purposes, no dust at all. Engineering Controls. Engineering controls in conformance with ANSI Standards are required to keep dust exposures within permissible levels. All tools that produce dust will require local exhaust ventilation. Respirators are not a substitute and may be used only under limited circumstances. Work Practices. Wherever possible, the asbestos-containing material shall be worked wet. Furthermore, products with asbestos cannot be removed from the containers in which they are shipped without first being wetted or enclosed or ventilated in order to prevent the generation of airborne dust. Spray applica tion and the removal or demolition of asbestos materials will require the use of air-supplied respirators on those exposed. Personal Protective Equipment. Respirators are permissible control devices only in emergencies or during the time it takes to institute engineering controls. In some instances, and we would anticipate them to be infrequent, OSHA may allow the use of respiratory protection if they consider that other control methods are not technically feasible. The type respirator to be used for any given application will depend upon the associated concentration of asbestos dust. Where respirators are used, a respirator program must be instituted in conformance with ANSI Z88.2-1969. The elements of this ANSI ALCOA ARD 007007 July 1, 1972 Page 2 standard are included in the OSHA regulations, Part 1910t13U, page 10590-92 of the May 29, 1971, Federal Register. No employee will be required to wear a respirator if an examining physician determines the employee will be unable to function normally while wearing one. If necessary, such employees will be removed to another job without loss of pay. Special clothing must be provided by the employer if the employee is exposed to asbestos concentrations in excess of 10 fibers per cc. Where the employee is exposed to time-weighted, eight-hour concentrations in excess of five fibers per cc (two fibers per cc after July, 1976) or peak concentrations in excess of 10 fibers per cc, he must be provided with a change room and two lockers. The restrictions placed on the manner in which asbestos-containing clothing must be laundered are such that it might force the employer into the laundry business. Air Sampling and Analysis. All determinations of airborne asbestos will be made by the membrane filter method at I4.OO-I4.5OX magnification with phase contrast illumination. Within six months of the effective date, the employer must undertake both personal and general area sampling in those areas where asbestos fibers are released to the air. The pattern and frequency of sampling must be such that it is representative of exposures. However, the interval between samplings must be no longer than six months. The employees or their representative shall be given the opportunity to observe the air sampling and have access to the records generated from it. Any employee receiving an excessive exposure must be so notified and tola of the corrective action to be taken. Caution Signs and Labels. Signs of specified dimensions, type size and message must be posted in specified locations where asbestos fibers may be in excess of exposure limits. Specified caution labels must be placed on all raw materials, mixtures, scrap waste and debris and other products containing asbestos. Waste Disposal. Asbestos waste products which may produce airborne fibers under any foreseeable handling must be collected and disposed of in impermeable containers. Medical Examination. Preplacement, annual and termination medical examinations must be given to all employees exposed to airborne concentrations of asbestos fibers. The examinations must be comprehensive and include chest x-ray and pulmonary function tests. ARD 007008 July 1, 1972 Page 3 As you can see from the above, the asbestos standard is comprehensive. It will require a considerable amount of coordination between all management personnel and education of all employees. If any of us can be of help to you as you implement this standard, please let us know. T. B. Bonney W. N. Dawson R. H. Whtson TBB:WND:RHW:mh Attachment cc: F. E. Mueller, Pgh. - 23 C. L. Pittman, Pgh. - 27 0 P G.H. Farrah/J.M. Plunkett, ATC Information copies to: F. C. Irving, Jr., Pgh. - 29 R.S. Adams/R. Kohler, Alcas Cutlery Corp. F.D. Koran/E.A. Moats, Tifton Aluminum Co., Inc. A.P. LeClair, Jr./J.A. Elliott, H C Products Co. J.L. McKinley/R.B. Kempton/ M.L. Bookout, Rea Magnet Wire Co., Inc. R.F. Butler/D. Trudel, Permanent Mold Div,, Cleveland Works J.W. Anderson, ABP, Inc. A.C. 3ieldon/W.J, Koopman, AGPC, Allegheny Center J .W. Wamock, ACPC, Marshall Works J.S. Hamilton/J.J. Thimons, Wear-Ever Aluminum, Inc. R.C. Wilson, LeFiell Sport Products, Inc. D.D. Rhoads/W.A, Coward, Lincoln Manufacturing Co., Inc. J.C. Bates, Pittsburgh - 22 R.C. Dean, Frigidome Division ARD 007009 11318 RULES AND REGULATIONS |T-D. 73 153) PART 10--articles conditionally FREE, SUBJECT TO A REDUCED RATE, ETC. Free Withdrawal of Supplies and Equipment for Aircraft In accordance with section 309(d), Tariff Act of 1930, as amended (19 U.S.C. 1309(d1'. the Department of Commerce has found and under date of April 25, 1972. has advised the Treasury Depart ment that Poland allows privileges to aircraft registered in the United States and engaged in foreign trade substan tially reciprocal to those provided for in sections 309 and 317 of the Tariff Act of 1930. as amended (19 U.S.C. 1309, 1317). The same privileges are therefore hereby extended to aircraft registered in Poland and engaged in foreign trade effective as of the date of such notification. Accordingly, paragraph if > of 5 10.59. customs regulations, is amended by the insertion of Poland in appropriate al phabetical order and the number of this Treasury decision in the opposite col umn headed "Treasury Decisions)" in the list of nations in that paragraph. (Secs. 309. 317. 624, 46 Slat. 690. as amended, 696. as amended, 759, 19 U.S.C. 130), 1317, 1624) tsEALl Edwin F. Rains, Acting Commissioner of Customs. Approved: May 20,1972. Eugene T. Rossides, Assistant Secretary of the Treasury. |FR Doc 72-6678 Filed 6-6-72:8:50 am) Title 29--LABOR Chapter XVII--Occupational Safety and Health Administration, Depart ment of Labor PART 1910--OCCUPATIONAL SAFETY AND HEALTH STANDARDS Standard for Exposure to Asbestos Dust On December 7, 1971. an emergency temporary standard concerning exposure to asbestos fibers was published in the Federal Register <36 F.R. 232071. In ac cordance with section 6(0 (3 ' of the Williams-Steiger Occuptaional Safety and Health Act of 1970, a notice of proposed rulemaking regarding a permanent standard for exposure to asbestos fibers was publtsheri in the Federal Register on January 12. 1972 (37 F.R. 466' The no tice invited interested persons to submit both orally and in writing, data, views, and arguments concerning the proposal. On or about January 24. 1972, the Ad visory Committee oil Asbestos Dust was established and requested to make writ ten recommendations with ievard to the proposed standard on asbestos. On or about February 1, 1972, the Department of Health, Education, and Welfare trans mitted to the Secretary of Labor a cri teria document containing Recommenda tions for an Occupational Exposure Standard for Asbestos by the National Institute for Occupational Safety and Healtl) (NIOSH > Public notice was given of the receipt of the recommendations and their availability for inspection and copying. On or about February 25. 1972, the Advisory Committee on Asbestos Dust submitted its written recommendations to the Assistant Secretary of Labor for Occupational Safety and Health. Pursuant to the notice of rule making, a hearing was held on Mnrcli 14 through 17, 1972, for the purpose of receiving oral data, views, and arguments concerning the proposed standard. On or about March 31, 1972, the presiding hearing ex aminer certified to the Assistant Secre tary of Labor for Occupational Safety and Health the record of the proceeding. The record includes prehearing written comments, a transcript of the oral pres entations made at the hearing, and nu merous exhibits received during the course of the hearing or within the pe riod allowed after the close of the hearing. The proposed standard dealt with (1) permissible concentrations of asbestos fibers; (2) methods of compliance; (3' warning signs; (4) monitoring; (5) med ical examinations; and (6) recordkeep ing. Each of these major proposals elic ited comments, arguments, objections, and counterproposals. They all have been examined and considered. I. Acceptable concentrations of asbes tos dust. The proposed standard would limit occupational exposure to 8-hour time-weighted average (TWA) airborne concentrations of asbestos dust not ex ceeding five fibers longer than five micrometers per milliliter. Concentra tions above five fibers but not to exceed 10 fibers (ceiling concentration) would be permitted up to 15 minutes in an hour, but for not more than 5 hours in any one 8-hour day. NIOSH in effect has recommended that the five-fiber TWA and 10-flber peak concentrations be permitted only for 2 years; thereafter. TWA concentra tions should be not more than 2 fibers per cubic centimeter (cm.1) of air, and peak concentrations should not exceed 10 flbers/cm.5, with no time restriction. Numerous objections and counterpro posals have been made, with regard to both the limits of asbestos fiber concen trations and the time periods to comply with them. Some, for example, have rec ommended return to a 12-fiber standard of an earlier day; i.e., a level adopted under the Walsh-Heale.v Public Con tracts Act in 1969. Others have recom mended a two-fiber standard to become effective in 6 months, then a one-fiber standard for 2 years, and finally a zero- fiber standard after 3 years. These rec ommendations give a fair indication of the wide spread of the counterproposals. No one has disputed that exposure to asbestos of high enough intensity and long enough duration is causally related to asbestosls and cancers. The dispute is as to the determination of a specific level below which exposure is safe. Various studies attempting to establish quantita tive relations between specific levels of exposure to asbestos fibers and the ap pearance of adverse biological manifes tations, such as asbestosis. lung cancers, and mesothelioma, have given rise to controversy as to the validity of the measuring teclinlques used and the relia bility of the relations attempted to be established. Because of the long lapse of time between onset of exposure and biological manifestations, we have now evidence of the consequences of exposure, but we do noi have, in general, accurate measures of the levels of exposure oc curring 20 or 30 years ago. which have given rise to these consequences. There are also controversies concerning the relative toxicity of the various kinds of asbestos, and varying hazards In dif ferent workplaces. It is fair to say that the controversy has centered in the area between a two- fiber TWA concentration and five-fiber TWA concentration, with variations on the time needed for compliance. Many employers support a five-fiber TWA. Most medical opinion is divided between a two-fiber standard and a five-fiber standard. In view of the undisputed grave con sequences from exposure to asbestos fibers, it is essential that the exposure be regulated now, on the basis of the best evidence available now, even though it may not be as good as scientifically de sirable. An asbestos standard can be re evaluated in the light of the results of ongoing studies, and future studies, but cannot wait for them. Lives of employees are at stake. It is concluded that there should be one minimum standard of exposure to asbestos applicable to all workplaces ex posed to any kind, or mixture of kinds, of asbestos. Reasons of practical ad ministration preclude a variety of stand ards for different kinds of* asbestos aril of workplaces. Also, while the evidence tends to show that crocidolite. for in stance. is more harnmil than chrysolite, the evidence is not sufficient to establish separate standards for varieties of asbestos. Because there must be one stand.i 'd governing exposure to all varieties of asbestos, and in workplaces apparently more hazardous than others: because some present employees with regular ex posure to asbestos have probably al ready accumulated great doses of asbes tos fibers, due to higher levels of ex posure in the past: because it appears that levels of exposure which ma.i be safe with regard to asbestosis are not safe with regard to mesothelioma: be cause the statute requires the protection of every employee, even of one who may have regular exposure to asbestos during a working life which may reach, or even exceed, 40 years: and because of several other considerations which hate been urged and are reflected tn the record of the proceeding, the conflict in the medi cal evidence is resolved in favor of the health of employees. As of July 1, 1976, TWA concentrations of asbestos fibers longer than 5 micrometers will not be allowed to exceed two flbers/cc., with a ceiling value of 10 flbers/cc. The current TWA concentrations of five fibers, and FEDEIAl tEGISTER, VOL. 37, NO. 110--WEDNESDAY, JUNE 7, 1972 ARD 007010 11320 RULES AND REGULATIONS | 1910.93 Air contaminants. TiBLi O-*--Mnntiii Dosia ubstanes Mppef M|W eui: Crystalline: Quarts (respirable). 2601 lOmg'M'a %8lOr+6 %SIOr+2 Qimrtr tWiiul dost)...................................... 30mg/M CrlstobalUr*' CseHth# vtilut* raloulated from tha ooujU or mas formulae for quart!. Tndyniito: H the value calculat'd from U)t for mulae for qu&rta. Amorphous. Including natural dUUunioo-ous earth................... fe9lO+2 20 %BIOi SUteaU* deep than \% crys talline silica): Mica................................... Boapfinne............................... .. Talc........................................... Portland cement.................... Orephltc (natural).................... Coat dost (rcspimble fraction 10 lban 6% BlUi)................. For more than 5?I SlOj............ 20 jo JO AO 16 .... 2.4mg/M* or lOmg/M* Inert or Nuisance Dust: Respirable fraction___ Total dust.................... . C; SiOi+2 16 5mg/M* 60 J6mg/M* Note: Conversion factor*-- nppcfX36.3=million particles per cubic meter particles per c.c. 1 Millions of particles per cubic loot of air, based on Implnger samples counted by light-field technics. * Tbe percentage of crystalline silica in thA formula k tbe amount determined from air-borne samples, except In those instances in which other methods Dave been shown to be applicable. As determined by the membrane filter method at 480 X phase contrast magnification. Both concentration and percent quart! for the application of this limit are to be determined from the fraction passing a site-selector with the following characteristics. Aerodynamic diameter (unit density sphere) Percent passing selector 2 2. 6 2.6 6.0 10 90 76 M 26 '> The measurements under this note nf< - to rho use of an AKC Instrument. If the resplrnl '. fraction of coal dust is determined with a MR E the ficuri- corresponding to that of 2.4 Mg/M1 in the table for coal dustis 4.6 Mg/M*. 2. A new { 1910.93a Is added to Part 1910. reading as follows: 1910.93a Aibeitoi. (a) Definitions. For the purpose of this section. (1) "Asbestos" includes chrysotile, amoslte, crocidolite, tremollte, anthophyllite, and actinollte. (2) "Asbestos fibers" means asbestos fibers longer than 5 micrometers. (b) Permissible exposure to airborne concentrations of asbestos fibers--(1) Standard elective July 7. 1972. The 8-hour time-weighted average airborne concentrations of asbestos fibers to which any employee may be exposed shall not exceed five fibers, longer than 5 micrometers, per cubic centimeter of air, as determined by the method pre scribed in paragraph (e) of this section. (2) Standard effective July 1, 1976. The 8-hour time-weighted average air borne concentrations of asbestos fibers to which any employee may be exposed shall not exceed two fibers, longer than 5 micrometers, per cubic centimeter of air, as determined by the method pre scribed in paragraph <e) of this section. (3) Ceiling concentration. No em ployee shall be exposed at any time to airborne cencentrations of asbestos fibers in excess of 10 fibers, longer than 5 micrometers, per cubic centimeter of air, as determined by the method pre scribed in paragraph (e> of this section. (c) Methods of compliance--(1) En gineering methods. (H Engineering con trols. Engineering controls, such as, but not limited to, isolation, enclosure, ex haust ventilation, and dust collection, shall be used to meet the exposure limits prescribed In paragraph (b) of this section. <10 Local exhaust ventilation, (a) Local exhaust ventilation and dust col lection systems shall be designed, con structed, installed, and maintained in accordance with the American National Standard Fundamentals Governing the Design and Operation of Local Exhaust Systems, ANSI Z9.2-1971, which is in corporated by reference herein. <b) See 5 1910.6 concerning the avail ability of ANSI Z9.2-1971, and the maintenance of a historic file in connec tion therewit h. The address of the Amer ican National Standards Institute is given in 5 1910.100. (ill) Particular tools. All hand-op erated and power-operated tools which may produce or release asbestos fibers in excess of the exposure limits pre scribed in paragraph (b) of this section, such as, but not limited to, saws, scorers, abrasive wheels, and drills, shall be pro vided with local exhaust ventilation sys tems in accordance with subdivision (ii) of this subparagraph. (2) Work practices--(i) Wet methods. Insofar as practicable, asbestos shall be handled, mixed, applied, removed, cut. scored, or otherwise worked in a wet state sufficient to prevent the emission of airborne fibers in excess of the ex posure limits prescribed in paragraph (b) of this section, unless the usefulness of the product would be diminished thereby. Ui) Particular products and opera tions. No asbestos cement, mortar, coat ing, grout, plaster, or similar material containing asbestos shall be removed from bags, cartons, or other containers in which they are shipped, without being either wetted, or enclosed, or ventilated so as to prevent effectively the release of airborne asbestos fibers in excess of the limits prescribed in paragraph (b) of this section. (ill) Spraying, demolition, or removal. Employees engaged in the spraying of asbestos, the removal, or demolition of pipes, structures, or equipment covered or insulated with asbestos, and in the removal or demolition of asbestos in sulation or coverings shall be provided with respiratory equipment in accord ance with paragraph (d><2)(lii) of this section and with special clothing in ac cordance with paragraph (d) (3) of this section. (d) Personal protective equipment-- (1) Compliance with the exposure limits prescribed by paragraph <b> of this sec tion may not be achieved by the use of respirators or shift rotation of em ployees, except: (1) During the time period'necessary to install the engineering controls and to institute the work practices required by paragraph (c> of this section; (li) In work situations in which the methods prescribed In paragraph (c) of this section nre either technically not feasible or feasible to an extent insuffi cient to reduce the airborne concentra tions of asbestos fibers below the limits prescribed by paragraph (b) of this section: or (ill) In emergencies. <iv) Where both respirators and per sonnel rotation are allowed by subdivi sions (1), (ii). or (ill) of this subpara graph, and both are practicable, person nel rotation shall be preferred and used. (2) Where a respirator is permitted by subparagraph (1) of this paragraph, it shall be selected from among those ap proved by the Bureau of Mines, Depart ment of the Interior, or the National In stitute for Occupational Safety and Health, Department of Health, Educa tion, and Welfare, undr the provisions of 30 CFR Part 11 (37 F.R. 6244, Mar. 25, 19721, and shall be used in accordance with subdivisions (1>, (li), (ill), and (iv) of tills subparagraph. (i) Air purifying respirators. A reusa ble or single u*e air purifying respirator, or a respirator described in subdivision (ii) or (Ui) of this subparagraph, shall be used to reduce the concentrations of airborne asbestos fibers in the respirator below the exposure Unfits prescribed in paragraph (b' of this section, when the ceiling or the 8-hour time-weighted aver age airborne concentrations of asbestos fibers are reaconablv expected to exceed no more than 10 times those limits. (ii> Powered air purifying respirators. A full facepiece powered air purifying respirator, or a powered air purifying respirator, or a respirator described in subdivision <lii> of this subparagraph, shall be used to reduce the concentra tions of airborne asbestos fibers in the respirator below the exposure limits pre scribed in paragraph (bi of this section, when the ceiling or the 8-hour timeweighted average concentrations of asbestos fibers are reasonably expected to exceed 10 times, but not 100 times, those limits. (Ui) Type "C" supplied-air respirators, continuous flow or pressure-demand class. A type "C" continuous flow or pres sure-demand, supplied-air respirator shall be used to reduce the concentra tions of airborne asbestos fibers in the respirator below the exposure limits pre scribed in parerraph (b) of this section, when the ceiling or the 8-hour timeweighted average airborne concentra tions of asbestos fibers are reasonably expected to exceed 100 time* those limits. (iv) Establishment of a respirator pro gram. <q) The employer shall establish a respirator program in accordance with FIBftAl ISOUTH, VOL >7, NO. 11C--WHNiSOAY. JUNE 7, 197* ARD 007012 11322 RULES AND REGULATIONS Institute for Occupational Safety and tions. Records shall be retained by Instruction section lias been revised ac Health, and to authorised representa employers for at least 20 years. cordingly. Minor editorial changes have tives of either. (il) Access. The contents of the rec also been made. (2) Employee access. Every employee ords of the medical examinations 1. Section 9-1.101 Scope of subpart. Is and former employee shall have reason required by this paragraph shall be made revised to read as follows; able access to any record required to be maintained by subparagraph (D of this available, for inspection and copying, to the Assistant Secretary of Labor for 9--1.101 Scopf of ..ubpurt. paragraph, which indicates the em Occupational Safety and Health, the This subpart describes the Atomic ployee's own exposure to asbestos fibers. Director of NIOSH, to authorized physi Energy Commission Procurement Regu (3) Employee notification. Any em cians and medical consultants of cither lations and the AECPR Temporary Reg ployee found to have been exposed at any of them, and, upon the request of an em ulations. It also describes exclusions time to airborne concentrations of asbes ployee or former employee, to his physi from the AECPR as contained in the tos fibers in excess of the limits pre cian. Any physician who conducts a AEC Procurement Instructions. scribed in paragraph (b) of this section medical examination required by this 2. Section 9-1.102 Establishment of shall be notified in writing of the expo paragraph shall furnish to the employer AEC Procurement Regulations, is revised sure as soon as practicable but not later of the examined employee all the infor to read as fallmgs: than 5 days of the finding. The employee shall also be timely notified of the cor rective action being taken. (J) Medical examinations--Cl) Gen eral. The employer shall provide or make mation specifically required by this paragraph, and any other medical in formation related to occupational ex posure to asbestos fibers. 9-1.102 feAklishnu'nt of the AEC PrwngaH Regulations and the AECPU^bonrr Regulations. 9--1.102--"l Procurement Regula available at his cost, medical examina 3. A new 9 1910.19 is added to Subpart tions..,.. y tions relative to exposure to asbestos re B of Part 1910, reading as follows: (a) The ARC Procurement Regula quired by this paragraph. (2) Preplacemcnt. The employer shall provide or make available to each of his employees, within 30 calendar days fol lowing his first employment in an occupation exposed to Urbome con centrations of asbestos fibers, a compre hensive medical examination, which shall Include, as a minimum, a chest roent genogram (posterior-anterior 14 x 17 Inches), a history to elicit symptom atology of respiratory disease, and pulmonary function tests to include forced vital capacity (FVC) and forced expiratory volume at 1 second <FEVj.). (3) Annual examinations. On or be fore January 31, 1973, and at least an | 1910.19 Asbestos dii-l. Section 1910.93a shall apply to the ex posure of every employee to asbestos dust in every employment and place of employment covered by (1910.12, S 1910.13, { 1910.14,9 1910.15, or 9 1910.16, in lieu of any different standard on ex posure to asbestos dust which would otherwise be applicable by virtue of any of those sections. Effective date. Paragraph (b)(2) of 11910.93a shall become effective July 1, 1976. All other provisions of 19 1919.93a, 1910.93, and 1910.19 shall become effec tive July 7, 1972. The current emergency temporary standard remains in effect tions (AECPR) are hereby established. (b) These regulations Implement and supplement the Federal Procurement Regulations (FPR) and are a part of the Federal Procurement Regulations System. ___ (c) The effective date of FPR Issu ances throughout AEC will be the date indicated in the respective issuances un less otherwise provided in the AEC Pro curement Regulations. ___ (d) The effective date of AECPR is suances throughout AEC will be the date indicated In the respective Issuances. 9-1.102-2 AECPR Temporary Regu lation*. nually thereafter, every employer shall until July 7, 1972. (a) The AECPR Temporary Regula provide, or make available, comprehen sive medical examinations to each of his (Sacs. 6. 8. 84 SUt. 1883, 1688; 38 UA.C. 855. 857; 39 CFR 1810.4; Secretary of Labor's tions are hereby established. (b) These regulations implement and employees engaged in occupations ex Order No. 13-71, 88 F.R. 8764) supplement the Federal Procurement posed to airborne concentrations of as bestos fibers. Such annual examination shall include, as a minimum, a chest Signed at Washington, D.C., this 2d day of June 1972. Regulations Temporary Regulations. They also contain policies and proce dures initiated by the AEC which are roentgenogram (posterior-anterior 14 x G. C. Ouxnther, expected to be effective for a period of 17 Inches), a history to elicit symptom Assistant Secretary of Labor. 6 months or less. atology of respiratory disease, and pulmonary function tests to include [PR Doc.73-8674 FUad 0-6-73:8:48 am) (c) The effective date of the FPR Temporary Regulations issuances forced vital capacity (FVC) and forced throughout AEC will be the date indi expiratory volume at 1 second <FEV,). cated in the respective Issuances unless (4) Termination of employment. The Title 41--PUBLIC CONTRACTSemployer shall provide, or make avail otherwise provided in the AECPR Tem porary Regulations. able, within 30 calendar days before or AND PROPERTY MANAGEMENTafter the termination of employment of (d> The effective date of the AECPR Temporary Regulations issuances any employee engaged in an occupation exposed to airborne concentrations of asbestos fibers, a comprehensive medical Chapter 9--Atomic Energy Commission throughout AEC will be the date indi cated in the respective issuances. (e) The AECPR Temporary Regula examination which shall Include, as a minimum, a chest roentgenogram (pos PART 9-1--GENERAL tions are a part of the AEC Procurement Regulations and tire Federal Procure terior-anterior 14 x 17 inches), a history Subpart 9--1.1--Procuromont ment Regulations System. All references to elicit symptomatology of respiratory Regulations to the AEC Procurement Regulations or disease, and pulmonary function tests to Include forced vital capacity (FVC) Miscellaneous Amendments AECPR in i 5 9-1.103 through 9-1.109 of this subpart shall be deemed to include and forced expiratory volume at 1 second The changes made in AECPR Subpart the AECPR temporary regulations. (FEV,,,). (5) Recent examinations. No medical examination is required of any em ployee, if adequate records show that 9-1.1, Procurement Regulations, have been made in order to establish the AECPR Temporary Regulations, which are a part of the AEC Procurement Reg 3. Section 9-1.103 Authority, Is revised to read as follows: 9--1.103 Authority. the employee has been examined in ac ulations and the Federal Procurement The AEC Procurement Regulations are cordance with this paragraph within the Regulations System. The AECPR Tem prescribed bytfie General Manager. As past 1-year period. porary Regulations implement and sup sistant OenmUCanager for Administra (6) Medical records--(i) Mainte plement the FPR Temporary Regula tion, or the uttfletor. Division of Con nance. Employers of employees examined tions. They also contain policies and tracts of the AXC. pursuant to the au pursuant to this paragraph shall cause procedures initiated by the AEC which . thority of the Atomic Energy Act of 1954, to be maintained complete and accurate are to be effective for a period of 6 and the Federal Property and Adminis records of all such medical examina months or less. The AEC Procurement trative Services Act of 1949. F9CIAI MOICTH, VOL 37, NO. 110--WfONCUAY, JUNf 7, 1973 ARD 007014 FROM THOMAS B. BONNET PITTSBURGH OFFICE TO INDUSTRIAL HTGIENISTS SAFETY DIRECTORS July 20, 1972 RE: APPROVED ASBESTOS RESPIRATORY PROTECTION It has come to our attention that Mine Safety Appliances has in recent months upgraded their Dustfoe 66 respirator which is now approved under Schedule 21B. As such, its use is appropriate for protection against asbestos dusts in concen trations less than 51 fibers per cc. Also, the 3M #8710 single use respirator has been approved under the new schedule, 21C, and is likewise Moeptable for asbestos. Since these two respirators, which are smaller and relatively more comfortable than most of the other respirators on the previous lists sent you, we thought you would want to know of their suitability at an early date. A revised list of respiratory protective devices suitable for protection against asbestos dust is attached. The list is not complete. It Is merely intended to present a representative group and includes some of the more commonly used brands. If you normally use and prefer other types, we suggest that you contact your supplier to determine which of his respirators meet the require ments of the OSHA regulation for asbestos. Although the regulation promulgated on July 7 specifies that only respirators approved under 30 CFR 11 Bhall be used for protection against asbestos dust, there is only one respirator approved under this schedule as of this date. However, the Bureau of Mines has allowed a transition period from the present to March 30, 197k, during which respirators approved under previous schedules will be considered as approved. After this date, we will be required to use filter and air-line respirators approved under 30 CFR 11 (these will be classified as 21C and 19C respectively). Until that time, we consider filter respirators approved under Schedule 21B and continuous flow or pressuredemand, air-line respirators approved under Schedule 19B to be appropriate for protection against asbestos dust. 7^ f Thomas B. Bonney TBB:mh Attachment cc: R. H. Watson, Pittsburgh G.H. Farrah/J.M. Plunkett, ATC Info cc: F. C. Irving, Jr., Pgh. R.S. Adams/R. Kohler, Aloas Cutlery Corp. FJ). Koran/EJL. Moats, Tifton Aluminum Co. A.P. LeClair, Jr./J.A. Elliott, H.C. Products J.L. McKinley/R.B. Kerapton/M.L. Bookout, Rea Magnet R.F. Butler/D. Trudel, Cleveland Works J.W. Anderson, ABP, Inc. A.C. Sheldon/W.J. Kooptnan, ACPC J.W. Warnock, Marshall J.S. Hamilton/J.J. Thimons, Wear-Ever Alum., Inc. R.C. Wilson, LeFiell Sport Products, Inc. D.D. Rhoads/W.A. Coward, Lincoln Manufacturing J.C. Bates, Pgh. R.C. Dean, Frlgidome Div. ALCOA ARD 007015 REVISED 7/19/72 REPRESENTATIVE GROUP OF RESPIRATORS APPROVED BY THE U.S. BUREAU OF MINES UNDER SCHEDULE 2IB AO 3M MSA Willson R8100 with R100 filter R8156 with Rl$6 filter R5056 with R56 filter R6056 with R56 filter 8710* Dustfoe 66 Dustfoe 77 Custom COMFO with Type S filter 560 with R60 filter 1200 series with Rll filter Acne IEA Willson UNDER SCHEDULE 19B "CA" (Constant Flow) Zephyr Air Mask Constant Flow Air-Line Respirator, Facepiece type Leadfoe Air-Line Respirator (Helmet Type) Low Pressure Continuous Flow Air-Line Respirators High Pressure Continuous Flow Air-Line Respirators ^Approved under new Schedule 21C. ARD 007016 FROM ROBERT P. CARTER INDUSTRIAL HYGIENE! DIVISION PITTSBURGH OFFICE TO INDUSTRIAL HYGIENISTS August 21, 1972 RE: ASBESTOS-CONTAINING REFRACTORY AND INSULATING MATERIAT5 USED IN FURNACE AND CASTING EQUIPMENT CONSTRUCTION_________________ ________ ReFi R.P. Carter's letter dated 12/23/71 Re: Emergency Standard For Exposure to Asbestos Dust. G.H. Farrah's letter dated U/17/72 Re: Asbestos Dust Exposures. Because of the very stringent standard which has been established by OSHA for worker exposures to airborne asbestos fibers, we have received several inquiries for information as to which materials used in Alcoa operations contain asbestos so that the use of these materials can be surveyed for our conforming fully with the provisions of this standard. The list below includes, to the best of our knowledge, all asbestos-containing materials used in our furnace, smelting pot and casting equipment construction. We have not made any attempt to include here the asbestos-containing materials which are used for pipe lagging and other forms of insulation in general construction. Material Superex Insulation Marinite CFB Asbestos Asbestos Millboard or Paper (Note: May be supplied by Rubberoid or other supplier) Kaylo (Calcium silicate-asbestos combination) Transite Asbestos Tape Asbestos Content Q% 25-50* 100* 50* or more 10-15# 25-50* 80-99* For your further information, we are presently making a survey of refractory and insulating materials for free silica content which will be forwarded to you when obtained for your guidance in proper application of the OSHA standard for worker exposures to silica dusts. It will probably be six to eight weeks before this information has been obtained and compiled for transmitting to you. If we can be of any further assistance in this matter, please do not hesitate to contact Mr. G.H. Farrah on matters relating to the sampling and test methods and either Mr. T.B. Bonney or the writer on other matters related to this asbestos standard. Of course, Mr. V.W. Rieke and the Environmental Engineering Division will be actively involved in our engineering control efforts with respect to worker exposures to asbestos fibers and their assistance should be fully utilized in this area. Robert P. Carter RPCsmh ALCOA ARD 007017 Industrial hygienists August 21, 1972 Page 2 cc: V.W. Riekej Pittsburgh - 2 G.H. Farrah/J.M. Plunkett - ATC H.M. Short, Pittsburgh - 7 0 P M.J. Caprio, Pittsburgh - 19 Info copies to: F.C. Irving, Jr., Pittsburgh - 29 J.C. Bates, Pittsburgh - 22 R.S. Adams/R. Kohler, Alcas Cutlery Co. F.D. Koran/E.A. Moats, Tifton Aluminum Co., Inc. A.P. LeClair, Jr./J.A. Elliott, H C Products Co. J.L. McKinley/R.B. Kempton/M.L. Bookout, Rea Magnet Wire Co., Inc. R.F. Butler/D. Trudel, Permanent Mold Div,, Cleveland Works J.W. Anderson, ABP, Inc. A.C. Sheldon/W.J. Koopman, ACPC, Allegheny Center J.W. Warnock, ACPC, Marshall Works J.S. Hamilton/J.J. Thimons, Wear-Ever Aluminum, Inc. R.C. Wilson, LeFiell Sport Products, Inc. D.D. RhoadsAT.A. Coward, Lincoln Manufacturing Co., Inc. R.C. Dean, Frigidome Division ARD 007018 FROM PITTSBURGH PURCHASING INDUSTRIAL - 19 TO MEMORANDUM October l|., 1972 RE: NATIONAL PURCHASE AGREEMENT..P-615951 JOHNS-MANVILLE SUPEREX INSULATION BLOCK Johns-Manville has completed their development of an Asbestosfree high temperature insulation block. This is welcomed news in light of our concern on OSHA standards involving the handling of asbestos type materials. Beginning with October shipments, Johns-Manville will be filling all orders for Superex with either the present Superex material containing approximately 8% asbestos or the Asbestos-Free Superex. Until Johns-Manviliefs entire production capacity has been converted to the asbestos-free material, many orders may be mixed with both types of insulation block. During this conversion period, the Asbestos-Free Superex cartons will be stenciled with the suffix AF (Superex 2000 AF). When the transition is complete, the AF suffix will be dropped and all Johns-Manville Superex will be asbestos-free. Total conversion is expected on or before March 1, 1973. The new Asbestos-Free Superex has a maximum uae temperature of 2000F and is superior to the present Superex with respect to both compressive strength and thermal conductivity. The transverse strength (modulus of rupture) of the new board is slightly less than that of the asbestos board, but this difference should have little effect on our applications. A copy of the properties of the new board is attached. For the balance of our agreement period for Superex, the price of the new board will be the same as that for the present formulation of Superex. However, because of the higher cost ingredients in the new board, a price increase for Superex may be imminent when the present agreement expires on December 31 1972. For all future releases of Superex, do not specify "asbestosfree ". The new material will be fed into your orders on the basis of the supply on hand at the time of your release. 0ALCOA ARD 007019 Memorandum October 4, 1972 Page 2 We would appreciate your forwarding this information to your operating groups and, in particular, those concerned in policing OSHA standards. M. J. CAPRIO MJC/lmp Attachment Distribution: R. D. Griswold - Alcoa, Tennessee H. A. Barton - Badin J. K. Chambers - Bauxite W. E. King - Cleveland A. E. Gantt - Cressona H. P. Bpueschke - Davenport R. C. Miessler - Lafayette F. W. Hecker - Lancaster H. L. Gallop - Lebanon G. H. Duckworth - Massena J. V. Driscoll - Mobile R. N. Anderson - New Kensington (CMD) J. R. Zokaites - Point Comfort W. R. Eidson - Richmond G. R. Farneth - Rockdale D. J. Fisher - Vancouver C. A. Halliday - Vernon J. D. Eagan - Warrick C. J. Shank - Wenatchee 0. E. Proctor - Alcoa Technical Center T. B. Weber - Corona H. T. Culver - ACFC - Marshall G. F. Leymeister - Pittsburgh, 19 T. B. Bonney - Pittsburgh, 7 ARD 007020