Document 2yzrXraQj3JMpDn9nmQGj9M6

CHEMICALS AND PLASTICS To fNomo) Division lOCQtiQfi See Distribution List Cipy to operating division p. o. box 579, Niagara falls, new york 14302 Dei, November 25, 1968 Originating Dept. Research and Development Department Aniwtring letter dote Subject The Rheological Properties Contributed by R-G2M Asbestos in Vistron Poly ester-Base Resin J-379B The attached report, MThe Rheological Properties Contributed by R-G244 Asbestos in Vistron Polyester-Base Resin J-379B" by Ingalls and Kisiel presents a solution to the problem usually encountered in promoted thixotropic resin systems with any mineral thixotrope. The addition of small quantities of ethylene glycol overcomes the level ing effect on viscosity of the cobalt promoter. This information should be of value in any polyester system containing cobalt compounds. REB/'bsn Attach. DISTRIBUTION Messrs R. E. Byrne ^ W. L. Carrick S T. F, Frangos B. L. Ingalls M. S. Klsiel J. L. Myers (2) H. B Rhodes J. A. Riddle N. J, Setter W. S. Young THE -RHEOLOGICAL PROPERTIES CONTRIBUTED " BY R-C244ASBESTOS IN'VISTRON' POLYESTER-BASE' RESIN' J-379B for Vistron Corp-, Silmar Division Hawthorne, California bv B. L. Ingalls M: S: Kisiel Group Manager - W. L, Carrick Project No, 452-N14 November 25, 1968 UNION CARBIDE CORPORATION Chemicals and Plastics Research and Development Department Niagara Falls, New York 14302 A2055 OBJECTIVE Investigation by Vistron Corporation has shown evidence of poor viscosity stability with the use of R-G244 Asbestos in their polyesterbase resin J-379B, The purpose of this study was to determine optimum conditions for the utilization of R-G244 in this resin. RESULTS The poor performance of R-G244 in J-379B is attributed to the presence of cobalt naphthenate in the polyester which is detrimental to the surface bonding properties of R-G244, Results show that this may be overcome by the addition of a polar compound, such as ethy lene glycol, A combination of 0,75 phr R-G244 and 0,3 phr ethylene glycol was effective for promoting the desired stable viscosity and thixotropy specified by Vistron Corporation, DISCUSSION Two gallons of J-379B type resin were supplied by Vistron Corporation for this evaluation, R-G244 was incorporated by mixing in a laboratory Homo-Mixer at 5000 rpm for 3 minutes, Viscosity measure ments were obtained with a Brookfield Viscometer at 2 and 20 rpm and 25C, J-3793 resin contains cobalt naphthenate, an accelerator com monly used in polyester systems. Cobalt naphthenate has adverse effects on the performance of most thixotropes, including R-G244 Asbestos, The exact mechanism is not well understood; however, the general opinion is that cobalt naphthenate reacts or is adsorbed on the surface of the particulates reducing their tendency to bond, A small addition of a polar material, such as ethylene glycol, has been found effective for promoting viscosity and thixotropy. The thixotropic system specified by Vistron Corporation should have stable viscosities in the range of 1000 to 1600 cps at 2,5 rpm and 450 to 650 cps at 20 rpm. The rheological properties contributed by R-G244 in J-379B resin are illustrated in Table I, Nominal addi tions of ethylene glycol improved the viscosity and thixotropy of the R-G241} dispersion. Viscosity was found to remain relatively constant over a 5-week period; however, thixotropy decreased somewhat. It should be noted that viscosity at low shear was reasonably stable which is desirable for good antisag properties, A combination of 0,75 phr R-G244 and 0-3 phr ethylene glycol most closely approximates the rheological properties specified by Vistron Corporation. R. L- Ingalls/'bsn Attach. A 2055j I j. X 0) in in T3 c rH l rH M E o. ti O -3" o VO CM o o lo rH aE m o o e' i in en rH CM X a) CM in f-- T3 c C iH rH rH H aE uo ao o C-- CM oo on on r- CO Eal o o o uo oo CT\ rH ST CM rH rH X 0) ST t'- in T3 e c rH rH CM M aE uo oO VO VO on o in -=T VO CM E ao oo tn o o o CO CO VO CM rH in O Sh rH on JZ i ce a oo in in in u c- t-JZ c a .o o c aE u o o o in 4-3 CD oC 0 H in E CM on 40 CD U o rv Ch O to u cH o 0) X a H H s 4-3 1 co Cl) O oE --/ >> JZ 4-3 4-3 H H CO s O o T3 CO CD -rH X > H E a rH ST 0) ST H CM Cm O Xo 1 cc o u ca * T. p. Norris H*. B. Rhodes J. E. Walsh File`s . *IIS7SSES7TOS UNION CARBIDE CORPORATION METALS DIVISION P. 0. BOX 579 . NIAGARA FALLS, N.Y. 14302 TEL: 716-278-3376 January 12, 1978 Dr. Herb Davis Celanese Plastics Company 86 Morris Avenue Summit, NJ 07901 Dear Herb: The following is a brief recap of our telephone conversation yesterday regarding fthkefl fiber llaemngfthh rdl nistribhun ttiionnn of mouivr* "Cal<!idria5 "h asbestos products. The request for information on this subject originated with Joe Wynn of your purchasing department, who asked that it be submitted directly to you. We normally report the length of all our products as averaging five microns, with some fibers up to 20 microns probably being present. This is basically true for all of our products, as the same ore is used for our entire product line, and it is assumed that we do nothing in our processing which alters the length of the individual fibers. However, as I have never been sure where this data came from, I asked our metallography lab to take a quick look at three of our products. The work was not intended to be an "in depth research project," and I am sure that some bias may exist in their results. The products considered were: 1. "Calidria" R6-144 - A highly purified and well liberated fiber. (Presently being used at your Bishop, TX plant.) 2. "Calidria" RG-244 - Similar to RG-144 but which contains an amorphous silica coating. 3. COF-25 - Probably the purest and most liberated grade which we can produce commercially at this time. Each sample was dispersed in alcohol, utilizing a small amount of ultrasonic energy in order to break up some of the clumps and aspirated onto a carbon-coated copper grid. They were then examined under a transmission electron microscope at 20,000X and the length of 100 fibers selected at random measured. The results are presented in the attached table. Since our telecon yesterday, I obtained a prepublication copy of a paper describing similar work on "Calidria" RG-144 by Mount Sinai School of Medicine, the pertinent portion being enclosed. I have not made a comparison between the two sets of data, having chosen to let someone with a better under standing of statistics to do this. However, eyeballing the results, they seem to be in the same ballpark. Also, In regards to your question concerning the aspect ratio for defining an asbestos fiber, I am submitting the first page of a draft of the analytical method for determining asbestos fibers in air as specified by N10SH. As paragraph 1.3 points out, a particulate with a length to diameter ratio of 3 to 1 or greater is to be considered a fiber. Please let us know if we can provide additional information. Very truly yours. Manager-Eastern Region Sales & Technical Service GLDtdal Enclosures U0a ^ wm i File - Dust Counts THE DISCOVERT COMPANY UNION CARBIDE CORPORATION MINING & METALS DIVISION P.0. BOX 579 NIAGARA FALLS, N. Y. 14302 TEL: 716-278-3376 March 31, 1975 Mr. George Harlock President CHM Manufacturing Company 2860 West Third Court Hialeah, FL 33010 Dear George: A report of the dust samples I collected on February 20, 1975 is attached. Unfortunately, the two important breathing zone samples were so loaded with other dust that the counts are not reliable. We will have to get shorter samples next time. Regards, H. B. Rhodes Technology Manager HBR:cjb Attachment CC: J. E. Walsh OBJECTIVE Monitor airborne asbestos fiber during the use of "Calidria" asbestos RG-210 in the manufacture of tape joint compounds at the subject company. DESCRIPTION OF OPERATION The operation tested here was the manufacture of ready-mix tape joint compounds. The dry ingredients were added to a hopper with about a 3' X 6' spount opening equipped with a good exhaust hood. Two men lifted the bags off the pallets, placed them on the grid over the hopper, slit them, dumped the contents and stacked the bags. In the blending sequence, one man weighed out three five-gallon pails of SG-210 while the other stacked 35 bags of limestone in the hood. The clay bags were split and dumped, followed by mica, asbestos, and more limestone. The dumping of the three pails, plus one bag. of SG-210, took about one minute. Personal samples were taken on both operators during the dumping. When the bags were all dumped (10 minutes) Mr. Knop left the area and the sampler was removed. Mr. Manzoy remained for about 10 minutes to collect the bags and place them in a trash bin. He also used a wooden pole to clear the hopper as the material was removed via a,screw conveyer at the bottom. The asbestos bags were kept separate and placed in a covered fiber-pack drum. An environmental sample was taken in the passageway in front of the hood approximately 15' from the dumping. A second sample was taken 8' in front of the hood at the edge of* the raised dumping platform. This represents the concentration in the area between dumps. In normal production, about 10 batches are made per 8-hour shift. After the dry ingredients are dumped, they are moved by screw conveyer to the mud mixer on the floor below. A small amount of dust could be seen escaping from the seal at the mixer. One sample was taken (N-10) on the operator working in this area during the transfer step. SAMPLING EQUIPMENT AND TEST PROCEDURES Sampling and dust counting were carried out in accordance with OSHA Regulation 1910.93a, using the Bayer, Zummalde and Brown method for counting asbestos fibers by phase contrast microscopy (Bureau of Occupational Safety and Health, Feb. 1969). Battery-powered air pumps (M.S.A. type), calibrated to 2 liters per minute, were used to collect personal breathing zone and environmental samples on Mi Hi pore membrane filters of 0.8 micron porosity. Fiber counting was performed on a Vicker's phase contrast microscope at 400X utilizing a Porton reticle for sizing and field definition. Two results have been reported for each sample - they are: 1. Total Fiber - any material longer than 5 microns, having an aspect ratio greater than 3:1. This number would contain the asbestos fibers as well as other contaminants which meet the foregoing criteria. 2. Asbestos Fiber - any fiber longer than 5 microns, having an aspect ratio greater than 3:1 which, in the judgment of the operator, is chrysotile asbestos. Any fiber of questionable identity was counted as chrysotile asbestos. COMMENTS The OSHA regulations permit a maximum limit of 5 fibers greater than 5 microns in length per cubic centimeter of air sampled on an 8-hour, timeweighted average (TWA). The formula C-I .T,Ic+l-C,T0n +n C Tn describes the TWA where T C = fiber count in fibers/cc and T = time. The regulations also stipulate a ceiling concentration of 10 fibers/cc greater than 5 microns which is not to be exceeded at any time. TEST RESULTS The details of sample collection and resultant fiber counts are listed in the attached table. SUMMARY OF FIBER COUNTS o Air Sample Sample Time No. (Minutes) Description Total Fiber Count (Fibers/cc >5u) Asbestos Fiber Count (Fibers/cc >5u) N-27 60 Environmental - Prior to and during dump of 50 lbs. RG-210 (dump time approx. 10 minutes). Located 3' above floor and 15' from dump hood. 0.5 0.2 N-.10 15 Personal - (Israel Nelson) Man in 0.4 area during transfer of prepared dry mix containing SG-210 to mud mixer. 0.1 N-13 N-50 14 Personal - (Ken Knop) Dump operator 3.8* during dump of 50 lbs. SG-210. 22 Personal - (Luis Manzoy) Dump ** operator. During dump of 50 lbs. SG-210 and bag removal. 2.8* N-47 16 Environmental - Post control between 0.6 dumps. Located 5` above floor and approx. 8' in front of hood. 0.2 * Filter very heavily loaded - counts questionable. ** Filter loaded to extent counts prohibitive. Mr. George Harlock President CHM Manufacturing Company 2860 West Third Court Hialeah, FL 33010 Dear George: The report on the dust samples we collected at DCA is attached. The mixing samples give somewhat lower counts than we obtained in previous tests but Ed Kleber tells me that they were so heavily loaded that they probably should not even have been counted. Please urge Bob again to have the boys wear at least the simple respirator shown in the enclosed literature during the mixing. The spraying results were again low as expected. Thank you again for your help and cooperation. Best wishes for a happy Holiday Season. Regards, /^yvvy H. B. Rhodes Area Manager Marketing & Technology HBR:cjb Enclosures AIRBORNE ASBESTOS FIBER COUNTS for Development Corporation of America Florida November 22, 1974 Samples Collected By: Samples Analyzed By: Dr. H. B. Rhodes Union Carbide Corporation Mr. E. J. Kleber Union Carbide Corporation Union Carbide Corporation Mining and Metals Division Niagara Falls, New York DEVELOPMENT CORPORATION OF AMERICA Samp!e No N-ll N-6 K-l N-3 N-2 K-2 1-25 Sampling Time 9 Min. 12 Min. 9 Min. 19 Min 22 Min. 24 Min. 26 Min. Description Personal - Operator mixing ceiling spray. (Very heavily loaded filter). Personal - Operator's helper mixing ceiling spray and opening bags. (Very heavily loaded). Personal - Operator mixing 15 bags of CHM wall texture. (Most heavily loaded filter of all, not a reliable No.) Personal - Operator applying ceiling spray. Personal - Operator wiping ceiling spray. Personal - Operator spraying wall texture. Personal - Operator spraying "Glitter." Total Fibers/cc 7 5-m 10.6 Possible Chrysotil Fibers/c >5 -*i 1.8 1 13.4 2.4 1 28.6 0' 1.4 0.57 0.82 0.34 0.47 0.16 0.07 0 12S ROBERTS ROAD WALTHAM. MASSACHUSETTS 021SA USA (617) 694-3650 T*l 92*341 S \L i J January 12, 1972 i L- Vi-72 ' Lir.;'- Mining-Metal Division Union Carbide Corporation 270 Park Avenue New York, New York 10017 ATTENTION: MEDICAL DIRECTOR RECEIVED JAN 24 U . UCC-CAUDRiA NIAOAR ~ Alls. N.r. Dear Sir: We intend to utilize Carbide's Calidria Asbestos RG-244 and RR-144 in some of our heavy paste products. As we have the responsibility for the protection of the health and safety of our workmen, we need a set of safety rules and regulations for the use and handling of Calidria Asbestos products. Please comment on pneumoconiosis, fibrosis, and lung cancer of regular asbestos vs. Calidria Asbestos. Hoping you can help us set up a list of safety rules and regulations for using Calidria Asbestos products, we are looking forward to hearing from you. Should you have any specific questions or desire additional information os our products, please feel free to contact us at any time. Thank you for your attention to this matter. Very truly yours, COMPO INDUSTRIES, INC. AL/ema Arthur Lerner ^ , Research & Development A lU 0 ub PLANTS: Mansfield and Waltham. Maaaachuaatta SALES OFFICES: Binghamton. N.Y. Chicago Cincinnati Haverhill, Maaa. Lewiston. Ma. Loa Angalei Meehanlceburg. Pa. Montreal Naehville. Tenn. New Yortc City St. Louis Toronto m 1 i is.c>72 , Trj 7T 4 /7?~-rros THE DISCOVERY COMPANY UNION CARBIDE CORPORATION MINING & METALS DIVISION P.0. BOX 579 NIAGARA FALLS.N.Y. 14302 TEL: 716-285-3311 February 3, 1972 . Mr. Arthur Lerner Research & Development Compo Industries, Inc. I 25 Roberts Road Waltham, Ma. 02154 . Dea r Mr. Lerner: Pursuant to your request concerning the toxicology of our CALIDRIA Asbestos products, we are preparing a Corporate "position paper" on the entire subject and it should be available within 2-3 months. The new Federal Regulations and general publicity about asbestos hazards are, for the most part, directed at large consumers' and those exposed for long periods of"time to asbestos dust. `Your relatively small usage and exposure to RG-144 and R-G-244 should present no problems. We suggest that production workers use a respirator during handling and mixing of CALIDRIA Asbestos into the resin. Two respirators of similar design are recommended: Willson's Model No. 1009 with R-520 filter and MSA's No. 86432 with Type "H" Ultra-filter. Both of these have Bureau of Mines approval for asbestos dust and would serve quite well for pyrogenic silica and similar dusty materials. I have appended a copy of the new^Federal Regulations regarding asbestos under the OHSA section 1910.93a issued December 7, 1971. Should you have any further questions please do not hesitate to contact me. Very truly yours /c j b Manager - Eastern Region Sales L Technical Services