Document Gm3dJE8MobozNwoRYEEEvvGY

OCCUPATIONAL SAFETY & HEALTH REPORT CORPORATE SAFETY DEPARTMENT NO. 81 DISTRIBUTION: SEE LIST JUNE 21, 1973 ACGIH PROPOSES AND ADOPTS IMPORTANT CHANGES IN PHYSICAL AGENTS AND THRESHOLD LIMIT VALUES AT MAY MEETING _______________ Report of Physical Agents Cobf<* 1. Recommend the adoption of the heet atresi Threshold Limit Values which were published as a notice of Intent In 1972. 2. Recommend the adoption of the UV threshold limit values which were publlalied as a notice of intent in 1972 with the following changes: ' (1) Define acceptance angle as follows - All the preceding TLVs for ultraviolet energy apply to sources which subtend an angle less than 08 degrees. Sources which subtend a greater angle need to be measured only over an angle of 80 degrees. (2) Add "fluorescent" to list of sources in the first paragraph. (3) Drop "Solar radiation" from the first paragraph. (Deleted from report.) (4) Add footnote to "exclusion of lasers," to say "see laser TLV." 3. Recommend the adaption of the Laser threshold limit values which were published as a notice of intent In 1972 with minor changes In some tables In order to be consistent with ANSI 2*136 Laser Safety Standard. 4. Recommetag the adaption of a notice of Intent to change the Noise threshold limit values as follows: Proposed Chanaa in TLV - Noise These threshold limit values refer to sound pressure levels and durations of exposure that represent conditions under which It is believed that nearly all workers may be repeatedly exposed without adverse effect on their ability to hear and understand normal speech. The medical profession has defined hearing Impairment as an average hearing threshold level in excess of 25 decibels (ANSI-S3.6-1969) at 500,1000, and 2000 Hz, and the limits which are given have been established to prevent a hearing loss In excess of this value. The values should be used as guides in the control of noise exposure and, due to individual susceptibility, should not be regarded as fine lines between safe and dangerous levels. 1 5921 -2- Contlnuou* or Intermittent The sound level shall be determined by a sound level meter, conforming as a minimum to the requirements of the American National Standard Specification for Sound Level Meters. SI.A (1971) Type S2A, and set to use an A-welghted network with slow meter response. Duration of exposure shall not exceed that shown In Table 1 These values apply to total duration of exposure per working day regardless of whether this Is one continuous exposure or a number of short-term exposures but does not apply to Impact or Impulsive type of noise. When the dally noise exposure Is composed of two or sx>re periods of noise exposure of different levels, their combined effect should be considered, rather than the Individual effect of each. If the sum of the following fractions: < + c +...Cn T1 T2 Tn exceeds unity, then, the mixed exposure should be considered to exceed the thres hold limit value, Cl indicated the total duration of exposure at a specific noise level, and T1 Indicates the total duration of exposure permitted at that level. Impulsive or Impact Noise It is recommended that exposure to Impulsive or Impact noise should not exceed 140 decibels peak sound pressure level. Lqpulslve or Impact noise Is considered to be those variations in noise levels that involve maxima at Intervals of greater than one per second. Where the Intervals are less than one second, it should be considered continuous. Table 1 Threshold Limit Values Duration per day Hours 16 8 4 2 1 1/2 1/4 1/8 Sound Level (a) dBA 80 85 90 95 100 105 110 115* *No exposure to continuous or intermittent in excess of 115 dBA. (a) Sound level in decibels as measured on a sound level meter, conforming as a minimum to the requirements of the American National Standard Specification for Sound Level Meters, SI.4 (1971) Type S2A, operating the A-weighced network slow meter response. 1 5922 -3- Report of Chal>pM" nf the TLV Conmittee The TLV Conmittee meeting In plenary aesslon May 3 and 4 proposed for adoption by the ACGIH membership the attached changes and additions to appear in the TLV Booklet for 1973. KEY POINTS! 1. Proposed 1972 heat stress TLV's are adopted. This is first time any heat stress standards have been adopted. 2. Noise TLV of 80 dbA for 8 hr. has been proposed, (particularly significant because difficult to achieve in practice) 3. A list of tentative TLV's proposed last year has been adopted. Materials listed of special Company Interest include: ethylene glycol vapor, isopropyl ether, methyl bromide, and perlite. { 4. A list of proposed c'. ai.-es In current values include iron oxide fume an# sodium hydroxide. ? 5. A list of TLV's for compounds previously not included is given. Entries of Company Interest Include (lethyl phthelate and potassium hydroxide. WHAT TO DO NOW: This information should be circulated among technical personnel with the need to know. If the 1972 TLV list is not on hand, copies can be obtained directly from: Secretary-Treasurer American Conference of Governmental Industrial hygienists Post Office Box 1937 Cincinnati, Ohio 45201 Price is $.75. The 1973 liat la expected to be published In the Fall. REFERENCE: Occupational Safety & Health Reporter. Bureau of National Affairs, Inc. pagas 1557-1560. BROOKLYN CAMILLI COTY 55th STREET' EAST ST. LOUIS EASTON EMERYVILLE GREESNBORO GROTON GROTON RESEARCH GROTON RESEARCH DISTRIBUTION B. J. Flanagan E. Pace M. J. Grossfeld P. L. Frazar H. F. Metcalfe R. B. Neblnger J. R. Taylor C. F. Archer T. H. Althuis R. H. Sayre INTERNATIONAL LEE'S SUMUT MAYWOOD MILWAUKEE OLD BRIDGE PARSIPPANY PUERTO RICO SANFORD SLATING!ON TERRE HAUTE R. J. Murdock J. R. Plaas M. L. Nowack T. Dayhuff J. F. Major D. C. Schaller M. Calderon D. C. Walker W. Groth C. B. Everly 1 5923 TRANSFERS FROM STATUS OP TENTATIVE LISTING TO LIST OF ADOPTED VALUES la accordance with general policy of transfer after 2-year period without indication for actios otherwise. SUBSTANCE 20 ng/m3 mppcf Acetaldehyde C Acetic anhydride Anaonia Bismuth tellurlde Bismuth tellurlde (Se-doped) Butane 100 180 5 20 25 18 -- 10 --5 500 1,200 Chloroform (trichloroaethana) 25 120 Coal dust (bituminous) 2 (Respirable dust fraction < 5Z quarts). (If > 52 quartz use respirable mass formula) 1,2-Dibromoethane (ethylene dibromida)--Skin 20 145 1,1-Oichloroethane 200 820 Diehloroethyl ether--Skin 5 30 Dilsobucyl ketone 25 D Olquae 3.5 2-Ethoxyethanol--Skin 100 370 Ethylene glycol, particulate -- 10 Ethylene glycol, vapor 100 260 Fluorine 12 Germanium tetrahydrlde (Germane) 0.2 0.6 Hexafluoroaeetone 0.1 0.7 Isopropyl ether 250 1,050 Lead, inorganic compounds fumes & dusts -- 0.15 Methylacrylonicrile--Skin 13 Methyl bromide--Skin 15 60 Methylcyclohexanol 50 235 o-Me thylcyclohexanone--Skin 50 230 Perlite -- C Phenylphosphine 0.05 0.25 Silicon aw 10 C Subtilialns (Proteolytic enzymes as 100Z pure crystalline enzyme) -- 0.0003 Sulfur tatrafluorlde 0.1 0.4 Toluene 100 375 __ 1 30 1 5924 -5- CHANGES IN ADOPTED VALUES - TENTATIVE LISTINGS All chans* that ara reconended ax* based on docuaantad evidence which is available from the chairman. Substance Cadmiua oxid* fume Carbon dioxide blsChloroethyl ether Copper fuaa Iron oxide fuse Paraffin wax fuse Sodius hydroxide From To 0.2 ag/m^ C 0.05 ag/a^ Documentation to perait TLV of 15,000 ppa provided certain stipulated aedlcal criteria are aet. 10 ag/a? 1 ag/a3 2 ag/a3 *. Bg/B' C 2 ag/a3 4 ADDITIONS TO TENTATIVE LISTINGS All new additions ara based on docuaantad evidence and ie available froa the chairman. Substance ppa mg/a^ Carbon tetrabroalde 0.1 Cesium hydroxide Catechol 1 Chlorodlfluoromethane 1000 Chloropyrifos (Dursbas * )--Skin o-Chlorostyrane 50 Clopidol (Coyden * ) 2-Chloro-6--(trlchloronethyl)pyridine (N-Serve * ) Crufonate (Ruelene * } Dicyclopeatadlenyl iron Diethyl pfcthalate 3,5-Dlnlero-o-toluaaide (Zoalene * ) Foraaalde Kathylethyl ketone peroxide C 0.2 Pldoran (Tordon * ) Potasslua hydroxide Tricyclohexyl tin hydroxide(Pllctran * ) Vinylldene chloride 10 1.4 2 4.5 3500 0.2 283 10 10 5 10 5 5 20 1.5 10 C2 5 40 The TLV Cosmlttee recoamends that the foregoing changes in the TLV booklet be adopted by the Conference and that the 1973 booklet contain these changes. 1 5925