Document YkdeXqywnbj2k7Zr5nMGMwQN

October 14. 195 P. INTERNAL CORRESPONDENCE The attached Threshold Limit Values for 1958 are essentially the same as those for 1957. The value for nitric acid has been raised from 5 to 10 ppm by volume and a new tentative limit of 1.0 mg. per cubic meter of air has been set for phosphoric acid. Also enclosed is a publication of the Michigan Department of Health on the proper use of hand and automatic degreasers. LVC:0n Ends. 2 L. V. Cralley Industrial Hygiene Committee R. S. Adams - Olean P. B . Colby - Garwood E. N. Goas - Cressona W. F.. Goza - Pt.Comf o r t P. P. Haluska - Cleveland N. A. Hayes - nadin G. W. Hut ton - Wenatchee P-. H. IlUJ l 1. l< - Davenport J. P. LaClair - Lancaster J. H. Long - F.. St. Lou i s A. n. Masters - Lafayette R. II. Moore - Rosiclare J. J. Moroney w. L. Mowc - Massena - Mobile C. G. Orr - Alcoa Fab. R. E. Paine - Vernon n. l. Parsons - Warrick A. W . Petrey - Vancouver J. w. Schachtele - Chillicothe w. c. S e i p p - Detroit 11. A. S c ini; c n - R o c 1: d a 1 c D. p. Shantz C. s. Short C. L. Teuhert E. M. Trimble J. P. Uelborn R. F . Whitson W. V.M .Williams n. n. Youngblut - Richmond - N.K. - Chicago - Bauxite M. - Bridgeport - Bauxite A1 - Alcoa Sn. - Edgewat er 1 (See next page) ARC 001262 cc/cnds: <-t 73 r> n A . L. A1 cxand r r . T. Bardo . G. Bell . H. nrown . T.. Burns Frank Cox n. H. Droz A. L. Gantt 0. L. Goclct G. L. Hunting V. '. G. Martin A-, B-,--Mae-t era------Jutni Miiiui E. J. Mulligan F. II. Rcgchr A. w. Westfall G. D. Wheeler L. L. White T, B. Bonney Ki J. M. Plunkett C. L. Bradshaw & W. R. Gilliland - Alcoa S m. - Massena - Cleveland - Mobile - Warrick - Alcoa Fab. - Wenatchee - Badin - Detroit - Vancouver - Rockdale ----La fay nt ft _ MU I 1 QJ.1L-O1-- - Pt. Comfort - Vernon - F.. St. Louis - Pt. Comfort - Bauxite Al. - ARL - N.K. - Pfih. APC 001263 Threshold Limit Values for 1958 Adopted at the 20th Annual Meeting of the American Conference of Governmental Industrial Hygienists Atlantic City, April 19-22. 1958 Threshold limits should be used as guides in the control of health hazards and should not be regarded as fine lines between safe and dangerous concentra tions. They represent conditions under which it is believed that nearly all workers may be repeatedly exposed, day after day, without adverse effect. The values listed refer to time-weighted average concentrations for a normal work day. The amount by which these figures may be exceeded for short periods without injury to health depends upon a number of factors, such as the nature of the contami nant, whether very high concentrations even for short 'periods produce acute poisoning, whether the effects are cumulative, the frequency with which high concentrations occur, and the duration of such periods. All must be taken into consideration in arriving at a decision as to whether a hazardous situation exists. Special consideration should be given to the application of these values in the evaluation of the health hazards which may be associated with exposure to com binations of two or more substances. Threshold limits are based on the best available information from industrial experience, from experimental studies, and, when possible, from a combination of the two. These values are based on various criteria of toxic effects or on marked discomfort; thus, they should not be used as a common denominator of toxicity, nor should they be considered as the sole criterion in proving or dis proving diagnosis of suspected occupational disease. These limits are intended for use in the field of industrial hygiene and should be employed by persons trained in this field. They are not intended for use, or for modification for use, in the evaluation or control of community air pollu tion or air-pollution nuisances. These values are reviewed annually by the Committee on Threshold Limits for changes, revisions, or additions as further information becomes available. The Committee welcomes the suggestion of substances to be added to the list and also comments, references, or reports of experience with these materials. Submitted for publication May S, 1958. RECOMMENDED VALUES Case* and Vapor* (STANCE PPM* Acetaldehyde ................... 200 Acetic acid ............ .... 10 Acetic anhydride ... .... 5 Acetone .................... .... 1,000 Acrolein .................... .... 0.5 Acrylonitrile ............ .... 20 Allyl alcohol .......... .... 5 Ally! chloride ..........____ 5 Approx! Msc. oer Cu. M. t 360 25 20 2,400 1.2 45 12 IS SuaSTANCE PPM * Allyl propyl disullide Ammonia ..................... .. Amyl acetate .............. . Amyl alcohol (isoamy! alcohol) .. .. Aniline ......................... .. Arsine ........................... .. Benzene (benzol). .... .. 2 100 200 100 s o.os 25 Approx. Me lier Cu. M. t 12 70 1,050 360 19 0.2 80 178 APC 001264 TIIKliXItOU) /.HUT r.ll.l'I.S' vox mx Sl-'HSTANO: ITM * llwzyl chloride .............. llnttniitc ......................... I I lluindicue (1.3-hutadicuc) ............ 1.000 Htitaunfie (methyl ethyl ketone) - 250 Butyl acetate (n-lmtyl acetate) ___ 200 Butyl alcohol ` (t-butanol) ................. 100 Butylamine ..................... Butyl celiosoive 5 (2-htitoxyeilwnol) ___ 50 Carbon dioxide................ 5,000 Carbon disulfide ............ 20 Cartxm monoxide .......... 100 Carbon tetrachloride .... 25 Celiosoive (2-cthoxvetlianoI) ___ 200 Celiosoive acetate (2-ctlioxyethyl acetate) 100 Chlorine ........................... 1 Chlorine trifluoride ........ 0.1 Chlorobenzene (monochlorobenzene) .. 75 Chloroform . (trichloromethane) ... 100 1-Chloro-l-nitropropane . 20 Chloropicrin ................... 1 Chioroprene (2-chloro- 1.J-butadiene) 25 Cresol (all isomers) ... 5 Cyclohexane ................... 400 Cyclohexanol ................... 100 Cyclohexanone ................ 100 Cyclohexene ................... 400 Cyclopropane ................... 400 Decaborane ..................... 0.05 Diacetone alcohol (4-hydroxy 4 methyl* 2-pentanone) ................ 50 Dibonne ......................... 0.1 fl-Diehlorobeniene .......... 50 DichlorodiAuoromethane 1.000 1.1-Dichloroethane .......... 100 12-Dichloroethane (ethvloie dichlonde) .. 100 1.2-Dichloroethyiene ... 200 Dichloroethyl ether ........ Dichloromonofluoro- 15 methane ....................... 1,000 1,1-Dichloro-l-mtro- ethane ........................... 10 Dichlorotetrafluoroethane 1,000 Diethylanune ................... 2S Difluorodibromomethane 100 Diisobutyl ketone .......... 50 Approx. M e. tier Cu. M. t 5 7 2.200 740 950 300 15 240 9.000 60 110 160 740 540 3 0.4 350 490 100 90 22 1.400 410 400 t 550 690 0.3 240 0.1 300 4.950 400 400 790 90 4,200 60 7.000 75 860 290 SunsTANCK r I'M I )imet 1lyInniline (N-dimrtlivlamlmc) . 5 Dimcthyl.Milfaie ............. 1 Dioxane (dieihylcnc dioxide) ....................... 100 Ethyl arctale ................. 400 Ethyl acrylate............... 25 Ethyl alcohol (ethanol) 1.000 Ethylamine...................... 25 Ethylbenzene ................... 200 Ethyl bromide ............... 200 Ethyl chloride ............. 1,000 Ethyl ether .................... 400 Ethyl formate ............... 100 Ethyl silicate ................. 100 Ethylene chlorohydrin .. 5 Ethylenediamine ............. 10 Ethylene dibromide (1,2`dibromocthane) .. 25 Ethylene imine ............... 5 Ethylene oxide ............. SO Fluorine .......................... 0.1 Fluorotrichloromethane . 1,000 Fortnaldehvde ................. 5 Furfural .......................... 5 Gasoline .......................... 500 Heptane (x-heptane) ... 500 Hexane (i-hexane) ... 500 Hexanone (methyl butyl ketone) ......................... 100 Hcxone (methyl isobutyl ketone) ........................ 100 Hydraaine ...................... 1 Hydrogen bromide.......... 5 Hydrogen chloride.......... 5 Hydrogen cyanide ......... 10 Hydrogen Auoride.......... J Hydrogen peroxide, 90% 1 Hydrogen seienide.......... 0.05 Hydrogtn sulfide ......... 20 Iodine .............................. 0.1 Isophorone ....................... 25 Isopropylamine ............... 5 Mesityl oxide ................. 25 Methyl acetate ............... 200 Methyl acetylene ........... 1,000 Methyl acrylate ............. 10 Methyl alcohol (methanol) ................. 200 Methyl bromide ............. 20 Methyl celiosoive (2-methoxyethanol) .. 25 Methyl celiosoive acetate (ethylene glycol mono methyl ether acetate) .. 25 Methyl chloride ............. 100 Aii>fox. Me. i*t ... M.t 25 5 Vi) 1.400 too 1.900 45 870 R90 2.600 1.200 300 850 16 30 190 9 90 0.2 5.600 6 20 2.000 2.000 1.800 410 410 1.3 17 7 11 2 1.4 0.2 30 \ 140 12 100 610 1.650 35 260 80 80 120 210 179 ^PC 001265 ABCHil'ES or INDUSTRIAL health SUKSTANCK rI'M Melhylal (dintethoxy- methane) ...................... 1,000 Methyl chloroform (I.l.l-trichloroethaiie) 500 Methylcyclohexane 500 Methylcyclohexanol ........ 100 Meihylcyclobexanonc ... 100 Methyl formate .............. 100 Methyl isobutyl carbinol (methyl amyl alcoliol) 25 Methylene chloride ( dichloromethane) ___ 500 Naphtha (coal tar) ___ 200 Naphtha (petroleum) ... 500 Nickel carbonyl .............. 0.001 Nitric acid ........................ 10 p-Nitroaniline .................. 1 Nitrobenzene .................... 1 Nitroethane ...................... 100 Nitrogen dioxide ............ 5 Nitroglycerin ...;............ 0.5 Nitromethane .................. 100 2-Nitropropone ................ SO Nitretoluene .................... 5 Octane ............................. 500 Oxone ............................... 0.1 Pentane ............................. 1,000 " Pentanone (methyl propyl ketone) 200 Perchlorethylene (tetrachloroethylene) 200 Phenol ............................. 5 Phenylhydrazine .............. 5 Phosgene (carbonyl chloride) .. 1 Apurox. Ms. per Cu. M. t 3.100 2.700 2.000 470 460 250 100 1,750 800 2.000 0.03 25 6 5 310 9 5 250 180 30 2J50 0.2 2,950 700 1.350 19 22 4 Substanck Pliosidiine PPM* .............. 0.0S Appro*. Mg. per Cu. M. t 0.07 Phophorus trichloride .. 0.5 3 Propyl acetate ................ 200 840 Propyl alcohol (isopropyl alcohol) .. 400 960 Propyl ether (isopropyl ether) .... 300 2,100 Propylene dichloride (1,2-dichtoropropane) . 75 350 Propylene imine .......... 25 60 Pyridine ........................... 10 30 Quinone ........................... 0.1 0.4 Stibine ............................. 0.1 Stoddard solvent .......... 500 0.5 2,900 Styrene monomer (phenylethylene) ........ 100 420 Sulfur dioxide ............... 5 13 Sulfur hexafluoride .... 1,000 6,000 Sulfur monochbride .... I 6 Sulfur pentaftuoride.... 0.025 0.25 l-Tertiarybutyltoluene .. 10 60 1,1,2^-Tetrarhbroethane 5 35 Tetrahydrofuran ............ 200 590 Tetranitromethane .......... 1 6 Toluene (toluol) .......... 200 750 o-Toluidine ..................... 5 22 Trichloroethylene............ 200 1,050 TriAuoromonobromo* methane........................ 1,000 6,100 Turpentine ................ 100 560 Vinyl chloride (chloroethylene) .......... 500 1,300 Xylene (xylol) ............. 200 870 * Parts o( vainr or &> i*r million parti of air by volume. 1 Ainiroumate millirraou per cubic meter of air. Toxic Dusts. Fumes, and Mists Mk- per SUBSTANCE Cu. M.J Aldrin (l,2,J.4,10,l&-hexachloro~ l,4,4a,5,8,8a-hexahydrt>-1,4,5,8- dimethanonaphthalene) ...................... 0 25 Animate (ammonium sulfamate) .... 15 Antimony ................................................. 0 5 AKTU (alpha-naphthy 1-thiourea) ... 03 Arsenic ..................................................... 0.5 Barium (soluble compounds) .............. 0 5 Cadmium oxide fume .......................... 0 1 Calcium arsenate .................................... 0.1 Chlordane (1.2,4.5.6.7,8,8- octachloro-3a.4,7,7a-tetrahydro- 4,7-methanomdane) ............................ 2 Chlorinated camphene. 60%.................. 0 5 Chlorinated diphenyl oxide .................. 0.5 Chlorodiphenyl (42% chlorine).......... 1 Chiorodiphenyl (54% chlorine).......... 0.5 Chromic acid and chromates (as CrOi) 0 1 Mg lcr Susstano: Crag herbicide (sodium 2-(2.4- Cu M.J dichlorophenoxy J ethanol hydrogen sulfate) ............................................. 15 Cyanide (as CN) ................................ 5 2,4-D( 2,4-uichlorophenoxyaeeuc acid) 10 DDT (2,2-bis|^-chloropltenyll-l,l,l* trichloroethane) ................................ 1 Dieldrin (1,2,3,4,10,10-hexachloro- 6t7-poxy-1,4,4a,5,6,7,8,8a*octan ydro- l,4,S.B`dimethano>naphthalene) ........ 0.25 Dinitrobenzene ...................................... 1 Dinitrotoluene .......................................... 15 Dinitro-o-cresol .................................... 0 2 EPN (O-ethyl O-j-niiropheiiyl thiunobenzenephosphonate) ............. 0.5 Ferham (feme dimethyt dithiocarbamate) .............................. 15 180 Vol 18, Aug, 1958 APC 001266 THRESHOLD LIMIT T.-lLl'I.S TOR I9S* SunsTAHCt PPM Mr. ocr Cu. M. t I'crroviuindiitm duel ............................. 1 Flnnritle .................................................. 2.5 Hytlroqitiimne ......................................... 2 Inn oxide (time ................................... 15 Lead ........................................................ 02 Lead anenale ......................................... 0.15 Limtane (hexachlorocyclohcxanc. Pimmi isomer) ................................. 0.5 Magnesium oxide funte.......................... 15 Malatliion (0,0-dimethyl dilhioptos- plate o( diethyl mercaptosuccinatc) 15 Manganese .............................................. 6 Mercury .................................................. 0.1 Mercury (organic compounds) .......... 0.01 Methoxychlor (22-di-P-metltoxy- phenyl-l.l.l-trichloroetliane) .......... 15 Molybdenum (soluble compounds) ......................... S (insoluble compounds) ...................... 15 Nicotine .................................................. 0.5 Parathion (O.O-diethyl O-f- nitrophenyl thiophosphate) .............. 0.1 Pcntachloranaphthalene ........................ 0.5 Pentachlorophenol .................................. 0.5 Phosphorus (yellow) ............................ 0.1 Phosphorus pentachloride .................... 1 Phosphorus pentasulhde........................ 1 Picric acid ............................................. 0.1 Pyrethrum .............................................. 2 Rotenone.................................................. 5 Selenium compounds (as Se) .............. 0.1 Sodium ftuotoacetate (1080) .............. 0.1 Sodium hydroxide .................................. 2 Substance ri'M * Me. tier Cu. M. 1 Strychnine ............................................... 0.15 Sulfuric acitl ........................................ 1 TEDP (tetraethyl dithionopyrophosphate) ..................... 0.2 TEPP (tetraethyl pyrophosphate) .. 0.05 Tellurium ................................................. 0.1 Tetryl (2,4,6-trinitrophenyl- mcthylnitrantine) ................................. 1.5 Thiram (letramethyl thiuram disulfide) ........................................... 5 Thallium (soluble compounds) .......... 0.1 Titanium dioxide .................................. 15 Trichloronaphthalene ........................... 5 Trinitrotoluene ........................................ 1.5 Uranium (soluhlc compounds) ..................... 0.05 (insoluble compounds) ..................... 025 Vanadium (VaOadust) .......................................... 0.5 (VaOa fume) ...................................... 0.1 Warfarin (3*[ acetonvlbentyl|-4- hydroxycoixiunn) ............................... 0.5 Zinc oxide fumes .................................. IS Zirconiwn compounds (as Zr) .......... 5 Bsrfioartiritrt For fatimiaiblt concentrations o( taSaa isotope* in sir. ace `'Maximum Permissible Amounts of Radioisotopes in the Human Bodr sod Maximum Ptrmnsibie Canccmratian in Air and Walef.** Handbook JJ, U. S. Deportment of Commerce. National Bureau of Standard*. March. Itll. In addition, are "Permissible Dose ftom External Source* of lontaine Radiation,*4 Hand, book S9, U. S. Department of Commerce, National Bureau of Standards. Sept. is. 191*. Re-rieaon of the two publications mentioned shore is in peatteas. t Milliframs of dust, fume, se mist per cubic meter of sir. Mineral Dusts SUBSTANCE MP PCF S Aluminum oxide ......................... ... so Asbestos ........................................ ... 5 Dust (nuisance, no free silica) ..... 50 Mica (below 5% free silica) ___ ... 20 ... 50 Talc ............................................... ... 20 Substance MPPCF| Silica high (above 50% free SiOt) .. . 5 medium (5 to 50% free SiOt) . . 20 low (below 5% free SiOt) ... . 50 Silicon carbide ............................... . so Soapstone (below S% free SiOs) . . f Millions o( pcrticki ptf cubic loot ( air. 20 Substance (x) Acetylene tetrabromide ............. (x) AUyl glycidyl ether (AGE) ............. (x) Beryllium ............... (x) Boron tnAuonde .. (x) **Butyl glycidyl ether (BGE) .. TENTATIVE VALUES PPM || l 10 1 50 Approx. Mg. per Cu. M.f 14 45 2y/m' 3 270 Substance PPM n (x) Butyl mercaptan .. Chlorine dioxide .. (x) Chloroacetaldehyde (x) Chlorobromomethane (ClBrCHa) .... (x) Diglycidyl ether (DGE) .............. 10 0.1 1 400 10 Approx. Mg. per Cu. M.l 35 0.3 3 2,100 55 11 APC 001267 AM. A. ARCHIVES OF INDUSTRIAL HEALTH fc > ?! SUESTANCE J'PM U lx) Dimethyl iorniainide 1,1-Dimethyl hydrazine .......... (x) Dipropyleneglycobncthylether .. (x) Elhvl mercaptan .. (x) Furluryl alcohol .. (x)Glycidol .................. sec-Hexyl acetate (x) Iiopropyl glycidyt ether (1GE) ... (x) Lithium hydride .. (x) Methyl mercaptan (x) a Methyl styrene .. lx) Monomethyl aniline (x) Paradichloro- beiuene .... (x) Perchloromethyl mercaptan .......... (x) Phenyl glyddyl ether (PGE) .............. 30 OS 100 250 50 50 100 so 50 100 2 75 0.1 50 Cil M.T 60 1 600 640 200 150 590 240 257/m* 100 480 9 450 0.8 310 Substance PPM II Phosphoric acid ... n-Prepyl nitrate .. 2S (x) Propylene oxide .. (x) Tertiary butyl alcohol ................ 100 100 (x) Tolylene-2,4diisocyanate ___ 0.1 1.2J-Trichloropropane.. 50 (x) Triethyl amine___ Triorthocresyl phosphate ............ 25 (x) Vinyl toluene ........ 100 ( x) Yttrium and in organic compounds (x) Xylidine .................. 5 (x) Teflon decomposition products .............. (x) Pentaborane (BtK>) Approx. Mg. per Cu. M.1 1 110 240 J00 0.7 300 100 01 480 5 25 m I Parti af vaner or gmi per million parti of air by mlumr I AijniiMM miUtfTUM ier cubtc meter oi air. is) These velum apemd on the tentative kit for I9S7. * Until store data are ferthcommf, it u important chat ati are eapoaed most be kept aa near 0 aa possible. i|>hcrK canccnirMMna el ihccc Malniill 10 which workers William L. Ball W. Claik CuorKK H. E. Stokingce Keith H. Jacobson Keevey B. Elkins W. K. Reinhabt Allan L. Coleman, Chatman APC 001268