Document dQyBD9rda4KgdnqpLBERYQ55

Adopted at the Twenty-Third Annual Meeting of the American Conference of Governmental Industrial Hygienist*. Detroit. April 9-12, 1961 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 concentrations. 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 workday. 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 contaminant, 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 assessing the health hazards which may be associated with exposure to combinations of two or more substances. Threshold limits are based on the best available information from industrial experience, from experi mental 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 disproving diagnosis of sus pected 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 pollution 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 sub stances to be added to the list and also comments, references, or reports of experience with these materials. Recommended Values Cases and Vapors Substance PPM Approx. Mg. per Cu.M. Substance PPM Approx. per Cu.1 Acetaldehyde ZOO Acetic acid 10 Acetic anhydride 5 Acetone 1000 Acetylene tetrabromide 1 Acrolein 0.5 Acrylonitrile skin 20 Allyl alcohol skin 2 Ally! chloride 5 Allyl propyl disulfide 2 Ammonia 100 Amyl acetate 200 Amyl alcohol (lsoamyl alcohol)! 00 Aniline skin 5 Arsine 0.05 Benzene (benzol) 25 Bensyl chloride 1 Boron trifluoride 1 Bromine 0.1 Butadiene (1,3-butadiene) 1000 2-Butanone (methyl ethyl ketone) 200 360 25 20 2400 14 1.2 45 5 15 12 70 1050 360 19 0.2 BO 5 3 0.7 2200 590 Butyl acetate (n-butyl acetate) 200 Butyl alcubol (n-butanol) 100 tart. Butyl alcohol 100 Butylamine 5 Butyl cellosolve (2-butoxyethanol) 50 p-tert. Butyltoluene 10 Carbon dioxide 5000 Carbon disulfide - skin 20 Carbon monoxide 100 Carbon tetrachloride - skin 25 Cellosolve (Z-ethoxyethanol) 200 Cellosolve acetate (2-ethoxyethyl acetate) 100 Chlorine 1 Chlorine dioxide 0.1 Chlorine trifluoride 0.1 Chlorobensene (monochlorobenzene) 75 Chloroform (trichloromethane) 50 1 -Chloro-1 -nitropropane 20 950 300 300 15 240 60 9000 60 110 160 740 540 3 0.3 0.4 350 - 240 100 1. Reprinted with permission from the American Conference of Governmental Industrial Hygienists. Note: The word "skin" following a compound's name indicates that the liquid compound can penetrate the skin to cause systemic effects. t. C** and Vpon (cant. 1 t Substance PPM Approx. Mg. par Cu.M. Subatance PPM Appro*. Mg per Cu.M. Chloropicrin 0.1 Chloroprene (2-chloro-l, 3-butadiene) 25 Creeol (*U lsomera) - akin 5 Cyelohauaa Cydohexanol 400 . 50 CjrcIohMtanoaa Cyclohexane 50 400 Oaeaboru* - akin 0. 05 DUcatona alcohol (4-hydroxy- 4-methyl-2-pantanone) 50 Diboraae o-Dichlorobenaene 0.1 50 p-Dichlorobenmene 75 Dichlorodifluoromethaae 1000 1,1 -Diehloroethaae 100 1,2-Diehloroethaae (athylana dichloride) 100 1,2-Dichloroethyleae 200 Dichlorootbyl atbar 15 Diebioronoaofluo roroethane 1000 1,1 -Dichloro-1 -nitroetbaae 10 Dichlorotetrafluoroethane 1000 Diatbylamisa 25 Dlfluorodlbromomethaae 100 Dllaobutyl katona 50 Dimethylanillne (N-dlmatbylaalline) - akla 5 Dimethylformamlde 20 1,1-Dlmathylbydraalaa - akla 0. S Dimethyl a ulfate - akla 1 Dlpropyleaa glycol matbyl atbar 100 Dioxaae (diethylene dloxlda) 100 Ethyl acetate 400 Etbyl acrylate - akla 25 Ethyl alcohol (ethanol) 1000 Ethylaxnlaa 25 Ethylbaaaaaa 200 Etbyl bromide 200 Etbyl chloride 1000 Ethyl atbar 400 Etbyl formate 100 Etbyl alllcata 100 Ethylaaa cblorohydrla - aklai 5 EthyleaadlamlBa 10 Ethylene dlbromlda (1,2-dibromoethane) 25 Ethylaaa lmlaa - akla 5 Ethylaaa oxide 50 Fluorlae 0.1 Fluorotrichloromethane 1000 Formaldehyde 5 Furfural 5 Furfuryi alcohol 50 Caaollna 500 ieptane (n-heptana) 500 iexane (n-hexane) 500 Haxanone (methyl butyl katona) 100 Hexone(methyl laobutylkatoaa)100 Hydraalna - akin 1 Hydrogen bromide 3 Hydrogen chloride 5 0.7 90 22 1400 200 200 1350 0.3 240 0.1 300 450 4950 400 400 790 90 4200 60 7000 75 860 290 25 60 1 5 600 360 1400 100 1900 45 870 890 2600 1200 300 850 16 30 190 9 90 0.2 5600 6 20 200 2000 2000 1800 410 410 1.3 10 7 Hydrogen cyaalde - akla Hydrogen fluoride Hydrogen peroxide, 90% 10 11 32 1 1.4 Hydrogen eulfide Iodine 0. 05 20 0.1 0.2 30 1 leophorone 25 140 laopropylamlna Mealtyl oxide ' Methyl acetate Methyl acetylene 5 25 200 1000 12 100 610 1650 Methyl acrylate - akin 10 Methylal (dimethoxymethane) 1000 35 3100 Methyl alcohol (methanol) Methyl bromide - akla 200 260 20 80 Methyl eelloaolve (2-metboxyethaaol) 25 80 Methyl calloeolve acetate (ethylene glycol moaometbyl ether acetate) 25 120 Methyl chloride 100 210 Methyl chloroform (1,1,1-trichloroethaae) 500 2700 Methylcyclohexane 500 2000 Methylcyclohexanol 100 470 Methylcyclohexaaoae 100 460 Methyl formate Methyl laobutyl carbiaol 100 250 (methyl amyl alcohol) 25 100 ft-Methyl etyreae 100 480 Methylene chloride (dlchloromethane) Monomethyl aniline - akla Naphtha (coal tar) 500. 2 200 1750 9 800 Naphtha (petroleum) Nickel carbonyl Nitric acid p-Nitroanlliae akla Nitrobeasene akin Nltroethane Nitrogen dioxide Nitroglycerin Mitromethane 2 -Nltropropana Nitrotoluene - akla 500 2000 0.001 0. 007 10 25 16 15 100 310 59 0.5 5 100 250 25 90 5 30 Octane Oeone Pentane 500 0.1 1000 2350 0.2 2950 Pentanoae (matbyl propyl katona) Pa rehloroetbylane 200 700 (tatrachloroethyleae) Phenol - akla Pheaylbydraaiae - akla 100 670 5 19 5 22 14 Phoephine 0.05 0. 07 Phoaphorua trichloride Propyl acetate 0.5 200 3 840 Propyl alcohol (laopropyl alcohol) 400 980 Propyl ether (laopropyl ether) 500 2100 Propylene dichloride (1,2-dlehloropropane) 75 350 Qaaea and Vapor* (cont.) ~ Substance Propylana Imina akin Propylaaa oxide Pyridine Quiaona Stibina Stoddard aolvaat Styrana monoraa r (pbanylathylana) Sulfur dloxida Sulfur hexafluoride Sulfur monocbiorida Sulfur pantafluorida 1,1,2,2-Tatrachloro- athaaa - akin PPM . 100 5 0.1 0.1 500 Approx. Mg. par Cu.M. 60 240 15 0.4 0.5 2900 100 5 1000 1 0.025 420 13 6000 6 0.25 .5 35 _ Subatanca Tatrahydrofuran Tetranitromethane Toluana (toluol) o-Toluldina akin Tolylene-2,4-diiaoeyanate Trichloroathylona Triethylamina Tr ifluoromonobromomathana Turpantlno Vinyl chlorida (chloroatbylana) Vinyl toluana Xylene (xylol) Xylldine - akin Approx. Mg. PPM par Cu.M. 200 590 1 200 750 .5 22 0 02* 0.14* 100 520 25 100 1000 6100 100 560 500 1300 100 480 200 870 5 25 Probably sufficiently low to protect against primary sensitisation, but may not protact paraona specifically aanaltlaad. Puata, Fumaa and Mlsta Subatanca Mg. par Cu. M. Subatanca Mg . par CiuM. Aldrln (1,2,3,4,10,10-hexachloro-l,4, 4a,5,8,8a-hexahydro-1,4,5,8-di- methanonaphthalene) akin 0.25 Animate .(ammonium aulfamata) 15 Antimony 0.5 ANTU (alpba-naphthyl-thiourea) 0.3 Araanic 0.5 Barium (aolubla compounda) 0.5 Beryllium 0. 002 Cadmium oxide fume 0.1 Calcium araanata 0.1 Chlordane (1,2,4, 5, 6,7, 8, 8-octa- chloro-3a, 4, 7, 7e-tetra-hydr-4, 7 -m cthanoindane) 2 Chlorinated camphene, 60% 0.5 Chlorinated diphenyl oxide 0.5 Chlorodlphenyl (42% chlorine) - akin 1 Chlorodiphenyl (54% chlorine) - akin 0.5 Chromic acid and chromatea (aa CrO,) 0.1 Crag herbicide (sodium 2-(2, 4-dichloro- phenoxy) ethanol hydrogen eulfate) 15 Cyanide (aa CN) - akin 5 2,4-D (2,4-dicklorophenoxyacetlc acid) 10 DDT (2.2-bia (p-chloropbenyl)-l, 1,1- trichloroethane) 1 Dieldrin (1,2, 3,4,10,10-hexachloro-6, 7-epoxy-1,4,4a,5,6,7,8,8a-octahydro - 1 ,-4, 5, 8-dimethanonapbthalene) - akin 0.25 Dinitrobensena akin 1 Dinitrotoluene - akin 1.5 Oinitro-o-creaol - akin 0.2 CPN (O-athyl O-p-nitropbanyl thiono- bcnxenephoaphonate) - akin 0.5 Farbam (ferric dimethyl dithlocarbamale) IS Ferrovanadium duat 1 Fluoride 2.5 Hydroquinone 2 Iron oxide fume Lead 15 0.2 Lead araenata 0.15 Lindane (hexachloroeydohexane, gamma iaomar) Lithium hydride Magnaaium oxide fume Malathion (O, O-dimethyl dithiophoephata 0.5 0.025 15 of diethyl mercaptoauccinate) - akin IS Manganeee 5. Mercury Mercury (organic compounde) - akin 0.1 0.01 Methoxychlor (2,2-di-p-raethoxyphenyl-l, 1,1 -trichloroethane) Molybdenum IS (aolubla compounda) (insoluble compounda) 5 15 Nicotine akin 0.5 Parathion (O, O-dietbyl-O-p-nltrophenyl thiophosphate) - akin Pentachloronaphthalene - akin Peniachlorophanol - akin Phosphoric acid 0.1 0.5 0.5 1 Phoaphorua (yellow) Phosphorus pentachlorlde Phoaphorua pentaaulfida 0.1 1 1 Picric acid - akin 0.1 Pyrethrum 2 Rotenone Selenium compounda (aa Sa) 5 0.1 Sodium fluoroacatate (1080) - akin 0.1 Sodium hydroxide 2 Strychnine Sulfuric acid 0.15 1 TEDP (tetraethyl dithionopyro- phosphata) - akin 0.2 TEPP (tetraethyl pyrophoaphats) akin 0.05 Tellurium 0.1 Tetryl (2,4,6-trinitrophenylmethyl- nitramine) - skin 1.5 Thallium (aolubla compounda) Thiram (tetramathyl thiuram diaulfida) 0.1 5 Titanium dioxida IS III. DimU, ruroti and Mists (cont. 1 Substance Ug. per Cu. M, Substance Mg. per Ca.M. Trlchloronapthalene - skin Trinitrotoluene - skin Uranium (soluble compounds) (insoluble compounds) Vanadium <V25 duat> (VjOj fume) 5 1.5 0.05 0.25 0.5 0.1 Warfarin (3-(C<-acetonylbensyl)4-hydroxycoumarin) Yttrium Zinc oxide fume Zirconium compounde (as Zr) 0.5 $ 15 5 Radioactivity: For permiselble concentrations of radisotopes in air, see U. S. Department of Commerce, National Bureau of Standards, Handbook 69, "Maximum Permissible Body Burdens and Maximum Permis sible Concentrations of Radionuclides in Air and in Water for Occupational Exposure", June 5, 1959. Al so, see U. S. Department of Commerce, National Bureau of Standards, Handbook 59, "Permissible Dose from External Sources of Ionising Radiation", September 24, 1954, and addendum of April 15, 1958. Mineral and Non-Metallic Inorganic Duste Substance Silica Quarts high (above 50% free silica) medium (5 to 50% free silica) low (below 5% free silica) Cristobalite (above 5%) Amorphous Silicates Mica Portland Cement Soapstone Talc MPPCF 5 20 SO 5 20 5 20 50 20 20 Substance Miscellaneous: Aluminum Oxide Caleite Dolomite Limestone Marble Silicon Carbide Other Inert Duets MPPCF 50 50 50 50 so 50 50 Tentative Values Substance PPM Acetonitrile Allyi glycidyl etber (ACE) 40 10 Boron oxide tert. Butyl chromate (as CrQj) n-Butyi glycidyl etber (BCE) 50 Butyl mercaptan 10 Chloroacetaldehyde 1 C biorobromome thane 200 DDVP (O, O-Dimsthyl-2,2- Dichlorodivinyl phosphate) Diglycldyl etber (DCE). 10 Dimethyl acetamide 10 Endrln (1,2,3.4,10.10-hexa- chloro-6,7-epoxy-1,4,4a, 5,6,7,8,8a-octa hydro-1, 4-endo, endo-S, 8-dimeth- anonapbthalene) Ethanol amine 0.5 Ethyl mercaptan 250 ulycidol 50 Heptachior (1,4,5,6,7,8,8-hep- tachloro-3a, 4,7, 7a-tetrahydro- 4, 7-methanoindene) Approx. Mg. per Cu.M. Substance PPM Approx. Mg per Cu. M. 70 45 IS 0. 1 270 35 3 1050 1 55 35 0.25 1 640 150 0.25 sec-Hexyl acetate 100 Isopropyl glycidyl ether (ICE) 50 Ketene Methyl mercaptan 0. 5 50 1 -Nitropropane 25 Pentaborane 0. 005 Perchlorometbyl mercaptan Phenyl glycidyl ether (PGE) 0. 1 50 Phosdrin (2-carbomethoxy-1 methyl vinyl dimethyl phos- phate) n-Propyl nitrate 25 Systox 2,4,5T (2,4, S-trichloro- phenoxy acetic acid) Teflon decomposition products (as F) 1,2,3-Trlchioropropane 50 1, l,2-Trichloro-l,2,2-tri- fluoroethane 1000 Triorthocresyl phosphate Tripbenyl phosphate 590 240 0.9 100 90 0.01 0.8 310 0.1 110 0.2 10 0.05 300 7600 0.1 3 (Signed): William L. Ball W. Clark Cooper Herbert E. Stokinger Hervey B. Elkins Keith H. Jacobson Russel C. Scovill William F. Rsindollar Allan L, Coleman, Chairman