Records 401–800 — US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side

Records 401 to 800 of 802. Each links to its own page, which carries the source URL and the quoted line that states the value.

• HydroquinoneHydroquinone | 123-31-9 | - | 2 | - |
• Indene95136 | | Indene | 10 | 48
• Indium7440746 | | Indium | -- | 0.1
• Indium compoundsIndium compounds | -- | 0.1
• IodineIodine | 7553-56-2 | (C)0.1 | (C)1 | - |
• Iodoform75478 | | Iodoform | 0.6 | 10
• Iron oxide dust and fume (as Fe)NIOSH REL TWA 5 mg/m3
• Iron pentacarbonyl, as Fe13463406 | | Iron pentacarbonyl, as Fe | 0.1 | 0.8 | | 0.2 | 1.6
• Iron salts, soluble, as FeIron salts, soluble, as Fe | -- | 1
• Isoamyl acetateIsoamyl acetate | 123-92-2 | 100 | 525 | - |
• Isoamyl alcohol; 3-methylbutanol123513 | | Isoamyl alcohol; 3-methylbutanol | 100 | 360 | | 125 | 450
• Isoamyl alcohol (secondary)NIOSH REL TWA 100 ppm (360 mg/m3) ST 125 ppm (450 mg/m3)
• IsobutaneNIOSH REL TWA 800 ppm (1900 mg/m3)
• Isobutyl acetateIsobutyl acetate | 110-19-0 | 150 | 700 | - |
• Isobutyl alcoholIsobutyl alcohol | 78-83-1 | 100 | 300 | - |
• IsobutyronitrileNIOSH REL TWA 8 ppm (22 mg/m3)
• Isoflurane26675467 | | Isoflurane | 2 | 15
• Isooctyl alcohol26952216 | S | Isooctyl alcohol | 50 | 270
• IsophoroneIsophorone | 78-59-1 | 25 | 140 | - |
• Isophorone diisocyanateNIOSH REL TWA 0.005 ppm (0.045 mg/m3) ST 0.02 ppm (0.180 mg/m3) [skin]
• Isopropyl acetateIsopropyl acetate | 108-21-4 | 250 | 950 | - |
• Isopropyl alcoholIsopropyl alcohol | 67-63-0 | 400 | 980 | - |
• Isopropyl etherIsopropyl ether | 108-20-3 | 500 | 2100 | - |
• Isopropyl glycidyl etherNIOSH REL C 50 ppm (240 mg/m3) [15-minute]
• IsopropylamineIsopropylamine | 75-31-0 | 5 | 12 | - |
• KaolinKaolin | 1332-58-7 | - | - | - |
• KeponeNIOSH REL Ca TWA 0.001 mg/m3
• KeroseneNIOSH REL TWA 100 mg/m3
• KeteneKetene | 463-51-4 | 0.5 | 0.9 | - |
• L.P.G.NIOSH REL TWA 1000 ppm (1800 mg/m3)
• LeadNIOSH REL TWA (8-hour) 0.050 mg/m3 See Appendix C
• Lead chromate, as Pb7758976 | | Lead chromate, as Pb | -- | 0.01
• LimestoneLimestone | 1317-65-3 | - | - | - |
• Limestone; calcium carbonate; see Particulates not otherwise regulated1317653 | | Limestone; calcium carbonate; see Particulates not otherwise regulated
• LindaneLindane | 58-89-9 | - | 0.5 | X |
• Lithium hydrideLithium hydride | 7580-67-8 | - | 0.025 | - |
• Lithium stearate4485125 | | Lithium stearate | -- | 10
• m-CresolNIOSH REL TWA 2.3 ppm (10 mg/m3)
• m-DinitrobenzeneNIOSH REL TWA 1 mg/m3 [skin]
• m-isomerm-isomer | 99-08-1 | - | - | - |
• m-Phthalodinitrile626175 | | m-Phthalodinitrile | -- | 5
• m-TerphenylNIOSH REL C 5 mg/m3 (0.5 ppm)
• m-Toluidine108441 | S | m-Toluidine | 2 | 9
• m-XyleneNIOSH REL TWA 100 ppm (435 mg/m3) ST 150 ppm (655 mg/m3)
• m-Xylene-a,a′-diamine1477550 | S | m-Xylene-a,a′-diamine | -- | 0.1 | C
• MagnesiteMagnesite | 546-93-0 | - | - | - |
• Magnesite; magnesium carbonate; see Particulates not otherwise regulated13717005 | | Magnesite; magnesium carbonate; see Particulates not otherwise regulated
• Magnesium oxide fumeMagnesium oxide fume | 1309-48-4 | - | - | - |
• Magnesium stearate557040 | | Magnesium stearate | -- | 10
• MalathionMalathion | 121-75-5 | - | - | - |
• Maleic anhydrideMaleic anhydride | 108-31-6 | 0.25 | 1 | - |
• MalonaldehydeNIOSH REL Ca See Appendix A See Appendix C (Aldehydes)
• MalononitrileNIOSH REL TWA 3 ppm (8 mg/m3)
• Manganese and compounds, as MnManganese and compounds, as Mn | -- | 0.2
• Manganese compounds and fume (as Mn)NIOSH REL TWA 1 mg/m3 ST 3 mg/m3
• Manganese compounds (as Mn)Manganese compounds (as Mn) | 7439-96-5 | - | (C)5 | - |
• Manganese, cyclopentadienyl-tricarbonyl, as Mn12079651 | S | Manganese, cyclopentadienyl-tricarbonyl, as Mn | -- | 0.1
• Manganese fume (as Mn)Manganese fume (as Mn) | 7439-96-5 | - | (C)5 | - |
• Manganese tetroxideManganese tetroxide | -- | 0.2
• Manganese tetroxide (as Mn)NIOSH REL See Appendix D
• MarbleMarble | 1317-65-3 | - | - | - |
• Mercury alkyls, as Hg7439976 | S | Mercury alkyls, as Hg | -- | 0.01 | 0.04 mg/M3 | -- | 0.03
• Mercury (aryl and inorganic) (as Hg)Mercury (aryl and inorganic) (as Hg) | 7439-97-6 | - | (2) | - |
• Mercury aryl compounds as Hg7439976 | S | Mercury aryl compounds as Hg | | 0.1 | C
• Mercury compounds [except (organo) alkyls] (as Hg)NIOSH REL NIOSH REL: Hg Vapor: TWA 0.05 mg/m3 [skin] Other: C 0.1 mg/m3 [skin]
• Mercury, metallic and inorganic compounds as Hg7439976 | S | Mercury, metallic and inorganic compounds as Hg | -- | 0.025 | 0.1 mg/M3
• Mercury (organo) alkyl compounds (as Hg)Mercury (organo) alkyl compounds (as Hg) | 7439-97-6 | - | (2) | - |
• Mercury (vapor) (as Hg)Mercury (vapor) (as Hg) | 7439-97-6 | - | (2) | - |
• Mesityl oxideMesityl oxide | 141-79-7 | 25 | 100 | - |
• Methacrylic acid79414 | S | Methacrylic acid | 20 | 70
• Methane74828 | | Methane | (h) | --
• Methomyl16752775 | S | Methomyl | -- | 2.5
• MethoxychlorMethoxychlor | 72-43-5 | - | - | - |
• Methoxyflurane76380 | | Methoxyflurane | 2 | 13
• Methyl 2-cyanoacrylate137053 | | Methyl 2-cyanoacrylate | 0.2 | 0.908
• Methyl acetateMethyl acetate | 79-20-9 | 200 | 610 | - |
• Methyl acetyleneNIOSH REL TWA 1000 ppm (1650 mg/m3)
• Methyl acetylene-propadiene mixtureNIOSH REL TWA 1000 ppm (1800 mg/m3) ST 1250 ppm (2250 mg/m3)
• Methyl acetylene-propadiene mixture; MAPPMethyl acetylene-propadiene mixture; MAPP | 1,000 | 1,800 | | 1250 | 2250
• Methyl acrylateMethyl acrylate | 96-33-3 | 10 | 35 | X |
• Methyl alcoholMethyl alcohol | 67-56-1 | 200 | 260 | - |
• Methyl bromideMethyl bromide | 74-83-9 | (C)20 | (C)80 | X |
• Methyl chlorideMethyl chloride | 74-87-3 | - | (2) | - |
• Methyl chloroformNIOSH REL C 350 ppm (1900 mg/m3) [15-minute]
• Methyl demetonNIOSH REL TWA 0.5 mg/m3 [skin]
• Methyl ethyl ketone peroxide1338234 | | Methyl ethyl ketone peroxide | 0.2 | 1.5 | C
• Methyl formateMethyl formate | 107-31-3 | 100 | 250 | - |
• Methyl hydrazineNIOSH REL Ca C 0.04 ppm (0.08 mg/m3) [2-hr]
• Methyl iodideMethyl iodide | 74-88-4 | 5 | 28 | X |
• Methyl isoamyl ketoneMethyl isoamyl ketone | 110-12-3 | 100 | 475 | - |
• Methyl isobutyl carbinolMethyl isobutyl carbinol | 108-11-2 | 25 | 100 | X |
• Methyl isocyanateMethyl isocyanate | 624-83-9 | 0.02 | 0.05 | X |
• Methyl isopropyl ketone563804 | | Methyl isopropyl ketone | 200 | 705
• Methyl mercaptanMethyl mercaptan | 74-93-1 | (C)10 | (C)20 | - |
• Methyl methacrylateMethyl methacrylate | 80-62-6 | 100 | 410 | - |
• Methyl n-amyl ketoneMethyl n-amyl ketone | 110-43-0 | 100 | 465 | - |
• Methyl parathionNIOSH REL TWA 0.2 mg/m3 [skin]
• Methyl silicateNIOSH REL TWA 1 ppm (6 mg/m3)
• Methyl tert-butyl ether; MTBE1634044 | | Methyl tert-butyl ether; MTBE | 40 | 144
• Methyl vinyl ketone78944 | S | Methyl vinyl ketone | 0.05 | 0.14 | C
• MethylalNIOSH REL TWA 1000 ppm (3100 mg/m3)
• MethylamineMethylamine | 74-89-5 | 10 | 12 | - |
• MethylcyclohexaneMethylcyclohexane | 108-87-2 | 500 | 2000 | - |
• MethylcyclohexanolMethylcyclohexanol | 25639-42-3 | 100 | 470 | - |
• Methylene bis(4-cyclohexylisocyanate)NIOSH REL C 0.01 ppm (0.11 mg/m3)
• Methylene bis(phenylisocyanate); MDI; diphenylmethane diisocyanate101688 | | Methylene bis(phenylisocyanate); MDI; diphenylmethane diisocyanate | 0.005 | 0.051
• Methylene chlorideMethylene chloride | 75-09-2 | - | (2) | - |
• Metribuzin21087649 | | Metribuzin | -- | 5
• Mevinphos; 2-carbomethoxyl-1-propen-2-yl dimethyl phosphate7786347 | S | Mevinphos; 2-carbomethoxyl-1-propen-2-yl dimethyl phosphate | 0.01 | 0.1 | | 0.03 | 0.3
• Mica (containing less than 1% quartz)NIOSH REL TWA 3 mg/m3 (resp)
• MolybdenumNIOSH REL See Appendix D
• Molybdenum, soluble compounds, as MoMolybdenum, soluble compounds, as Mo | -- | 0.5(n)
• Monocrotophos6923224 | | Monocrotophos | -- | 0.25
• Monomethyl anilineMonomethyl aniline | 100-61-8 | 2 | 9 | X |
• MorpholineMorpholine | 110-91-8 | 20 | 70 | X |
• n-Amyl acetaten-Amyl acetate | 628-63-7 | 100 | 525 | - |
• n-Butyl-acetaten-Butyl-acetate | 123-86-4 | 150 | 710 | - |
• n-Butyl alcoholn-Butyl alcohol | 71-36-3 | 100 | 300 | - |
• n-Butyl glycidyl etherNIOSH REL C 5.6 ppm (30 mg/m3) [15-minute]
• n-Butyl lactate138227 | | n-Butyl lactate | 5 | 25
• n-ButyronitrileNIOSH REL TWA 8 ppm (22 mg/m3)
• N-EthylmorpholineN-Ethylmorpholine | 100-74-3 | 20 | 94 | X |
• n-Hexanen-Hexane | 110-54-3 | 500 | 1800 | - |
• n-HexanethiolNIOSH REL C 0.5 ppm (2.7 mg/m3) [15-minute]
• N-isopropylaniline768525 | S | N-isopropylaniline | 2 | 10
• N-Methylpyrrolidone (NMP)872504 | S | N-Methylpyrrolidone (NMP) | 1 | 4
• N-NitrosodimethylamineNIOSH REL Ca See Appendix A
• n-PentaneNIOSH REL TWA 120 ppm (350 mg/m3) C 610 ppm (1800 mg/m3) [15-minute]
• N-Phenyl-β-naphthylamineNIOSH REL Ca* See Appendix A
• n-Propyl acetaten-Propyl acetate | 109-60-4 | 200 | 840 | - |
• n-Propyl alcoholn-Propyl alcohol | 71-23-8 | 200 | 500 | - |
• n-Propyl nitraten-Propyl nitrate | 627-13-4 | 25 | 110 | - |
• n-ValeraldehydeNIOSH REL TWA 50 ppm (175 mg/m3)
• Naphtha (Coal tar)Naphtha (Coal tar) | 8030-30-6 | 100 | 400 | - |
• Naphtha, coal tar8030317 | | Naphtha, coal tar | 100 | 400
• NaphthaleneNaphthalene | 91-20-3 | 10 | 50 | - |
• Naphthalene diisocyanateNIOSH REL TWA 0.040 mg/m3 (0.005 ppm) C 0.170 mg/m3 (0.020 ppm) [10-minute]
• Naphthalene diisocyanate; NDI25551284 | | Naphthalene diisocyanate; NDI | 0.01 | 0.085 | C
• Neon7440019 | | Neon | (h)
• Niax® Catalyst ESNNIOSH REL See Appendix C
• Nickel carbonylNIOSH REL Ca TWA 0.001 ppm (0.007 mg/m3)
• Nickel, insoluble compounds, as NiNickel, insoluble compounds, as Ni | -- | 0.1
• Nickel, metal and insoluble compounds (as Ni)Nickel, metal and insoluble compounds (as Ni) | 7440-02-0 | - | 1 | - |
• Nickel metal and other compounds (as Ni)NIOSH REL Ca TWA 0.015 mg/m3
• Nickel metal, as Ni7440020 | | Nickel metal, as Ni | -- | 0.5
• Nickel, soluble compounds (as Ni)Nickel, soluble compounds (as Ni) | 7440-02-0 | - | 1 | - |
• Nickel subsulfide12035722 | | Nickel subsulfide | -- | .05
• NicotineNicotine | 54-11-5 | - | 0.5 | X |
• Nitric acidNitric acid | 7697-37-2 | 2 | 5 | - |
• Nitric oxideNitric oxide | 10102-43-9 | 25 | 30 | - |
• NitrobenzeneNitrobenzene | 98-95-3 | 1 | 5 | X |
• NitroethaneNitroethane | 79-24-3 | 100 | 310 | - |
• Nitrogen7727379 | | Nitrogen | (h) | --
• Nitrogen dioxideNitrogen dioxide | 10102-44-0 | (C)5 | (C)9 | - |
• Nitrogen trifluorideNitrogen trifluoride | 7783-54-2 | 10 | 29 | - |
• NitroglycerinNitroglycerin | 55-63-0 | (C)0.2 | (C)2 | X |
• NitromethaneNitromethane | 75-52-5 | 100 | 250 | - |
• Nitrotoluene1321126, 99081, 88722, 99990 | S | Nitrotoluene | 2 | 11
• Nitrous oxide0024972 | | Nitrous oxide | 50 | 90
• Nitrous oxideNIOSH REL TWA 25 ppm (46 mg/m3) (TWA over the time exposed)
• Nonane111842 | | Nonane | 200 | 1,050
• Nuisance particulates, see Particulates not otherwise regulated Total dustNuisance particulates, see Particulates not otherwise regulated Total dust | -- | 10
• o-AnisidineNIOSH REL Ca TWA 0.5 mg/m3 [skin]
• o-Chlorobenzylidene malononitrileo-Chlorobenzylidene malononitrile | 2698-41-1 | 0.05 | 0.4 | - |
• o-Chlorostyrene2039874 | | o-Chlorostyrene | 50 | 285 | | 75 | 428
• o-Chlorotoluene95498 | S | o-Chlorotoluene | 50 | 250
• o-CresolNIOSH REL TWA 2.3 ppm (10 mg/m3)
• o-DianisidineNIOSH REL Ca See Appendix A See Appendix C
• o-Dichlorobenzeneo-Dichlorobenzene | 95-50-1 | (C)50 | (C)300 | - |
• o-DinitrobenzeneNIOSH REL TWA 1 mg/m3 [skin]
• o-isomero-isomer | 88-72-2 | - | - | - |
• o-Methylcyclohexanoneo-Methylcyclohexanone | 583-60-8 | 100 | 460 | X |
• o-sec-Butylphenol89725 | S | o-sec-Butylphenol | 5 | 30
• o-TerphenylNIOSH REL C 5 mg/m3 (0.5 ppm)
• o-TolidineNIOSH REL Ca C 0.02 mg/m3 [60-minute] [skin]
• o-Toluidineo-Toluidine | 95-53-4 | 5 | 22 | X |
• o-XyleneNIOSH REL TWA 100 ppm (435 mg/m3) ST 150 ppm (655 mg/m3)
• OctachloronaphthaleneOctachloronaphthalene | 2234-13-1 | - | 0.1 | X |
• OctaneOctane | 111-65-9 | 500 | 2350 | - |
• Oil (mineral) mist, particulate8012951 | | Oil (mineral) mist, particulate | -- | (5)(l)
• Osmium tetroxideNIOSH REL TWA 0.002 mg/m3 (0.0002 ppm) ST 0.006 mg/m3 (0.0006 ppm)
• Oxalic acidOxalic acid | 144-62-7 | - | 1 | - |
• Oxygen difluorideOxygen difluoride | 7783-41-7 | 0.05 | 0.1 | - |
• OzoneOzone | 10028-15-6 | 0.1 | 0.2 | - |
• p-AnisidineNIOSH REL TWA 0.5 mg/m3 [skin]
• p-CresolNIOSH REL TWA 2.3 ppm (10 mg/m3)
• p-Dichlorobenzenep-Dichlorobenzene | 106-46-7 | 75 | 450 | - |
• p-DinitrobenzeneNIOSH REL TWA 1 mg/m3 [skin]
• p-isomerp-isomer | 99-99-0 | - | - | - |
• p-Nitroanilinep-Nitroaniline | 100-01-6 | 1 | 6 | X |
• p-Nitrochlorobenzenep-Nitrochlorobenzene | 100-00-5 | - | 1 | X |
• p-Phenylene diaminep-Phenylene diamine | 106-50-3 | - | 0.1 | X |
• p-TerphenylNIOSH REL C 5 mg/m3 (0.5 ppm)
• p-tert-Butyltoluenep-tert-Butyltoluene | 98-51-1 | 10 | 60 | - |
• p-Toluidine106490 | S | p-Toluidine | 2 | 9
• p-XyleneNIOSH REL TWA 100 ppm (435 mg/m3) ST 150 ppm (655 mg/m3)
• Paraffin wax fume8002742 | | Paraffin wax fume | -- | 2
• Paraquat (Paraquat dichloride)NIOSH REL TWA 0.1 mg/m3 (resp) [skin]
• Paraquat, respirable sizes1910425, | S | Paraquat, respirable sizes | -- | 0.1(n)
• Paraquat, total particulates1910425, | S | Paraquat, total particulates | -- | 0.5
• ParathionParathion | 56-38-2 | - | 0.1 | X |
• Particulates not otherwise regulated Total dustParticulates not otherwise regulated Total dust | -- | 10
• PentaboranePentaborane | 19624-22-7 | 0.005 | 0.01 | - |
• PentachloroethaneNIOSH REL Handle with care in the workplace. See Appendix C (Chloroethanes)
• PentachloronaphthalenePentachloronaphthalene | 1321-64-8 | - | 0.5 | X |
• PentachlorophenolPentachlorophenol | 87-86-5 | - | 0.5 | X |
• PentaerythritolPentaerythritol | 115-77-5 | - | - | - |
• Pentyl acetate628637; 626380; 123922; 625161; 620111; 624419 | | Pentyl acetate | 50 | 266 | | 100 | 532
• Perchloroethylene127184 | | Perchloroethylene | 25 | 170 | 300 ppm | 100 | 685
• Perchloromethyl mercaptanPerchloromethyl mercaptan | 594-42-3 | 0.1 | 0.8 | - |
• Perchloryl fluoridePerchloryl fluoride | 7616-94-6 | 3 | 13.5 | - |
• Perfluoroisobutylene382218 | | Perfluoroisobutylene | 0.01 | 0.082 | C
• PerliteNIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)
• Petroleum distillates (naphtha)NIOSH REL TWA 350 mg/m3 C 1800 mg/m3 [15-minute]
• PhenolPhenol | 108-95-2 | 5 | 19 | X |
• PhenothiazineNIOSH REL TWA 5 mg/m3 [skin]
• Phenyl ether-biphenyl mixture (vapor)NIOSH REL TWA 1 ppm (7 mg/m3)
• Phenyl ether, vaporPhenyl ether, vapor | 101-84-8 | 1 | 7 | - |
• Phenyl glycidyl etherNIOSH REL Ca C 1 ppm (6 mg/m3) [15-minute]
• PhenylhydrazinePhenylhydrazine | 100-63-0 | 5 | 22 | X |
• Phenylphosphine638211 | | Phenylphosphine | 0.05 | 0.25 | C
• PhorateNIOSH REL TWA 0.05 mg/m3 ST 0.2 mg/m3 [skin]
• PhosgeneNIOSH REL TWA 0.1 ppm (0.4 mg/m3) C 0.2 ppm (0.8 mg/m3) [15-minute]
• PhosphinePhosphine | 7803-51-2 | 0.3 | 0.4 | - |
• Phosphoric acidPhosphoric acid | 7664-38-2 | - | 1 | - |
• Phosphorus oxychloride10025873 | | Phosphorus oxychloride | 0.1 | 0.6
• Phosphorus pentachloridePhosphorus pentachloride | 10026-13-8 | - | 1 | - |
• Phosphorus pentasulfidePhosphorus pentasulfide | 1314-80-3 | - | 1 | - |
• Phosphorus trichloridePhosphorus trichloride | 7719-12-2 | 0.5 | 3 | - |
• Phosphorus (yellow)Phosphorus (yellow) | 7723-14-0 | - | 0.1 | - |
• Phthalic anhydridePhthalic anhydride | 85-44-9 | 2 | 12 | - |
• PicloramPicloram | 1918-02-1 | - | - | - |
• Picric acidPicric acid | 88-89-1 | - | 0.1 | X |
• PindoneNIOSH REL TWA 0.1 mg/m3
• Piperazine dihydrochloride142643 | | Piperazine dihydrochloride | -- | 5
• Plaster of ParisPlaster of Paris | 26499-65-0 | - | - | - |
• PlatinumNIOSH REL TWA 1 mg/m3
• Platinum, soluble salts, as PtPlatinum, soluble salts, as Pt | -- | 0.002
• Portland cementPortland cement | 65997-15-1 | - | - | - |
• Potassium cyanide (as CN)NIOSH REL C 5 mg/m3 (4.7 ppm) [10-minute]
• Potassium hydroxideNIOSH REL C 2 mg/m3
• Potassium stearate593293 | | Potassium stearate | -- | 10
• PropanePropane | 74-98-6 | 1000 | 1800 | - |
• Propane sultoneNIOSH REL Ca See Appendix A
• Propargyl alcoholNIOSH REL TWA 1 ppm (2 mg/m3) [skin]
• Propionic acid79094 | | Propionic acid | 10 | 30
• PropionitrileNIOSH REL TWA 6 ppm (14 mg/m3)
• PropoxurNIOSH REL TWA 0.5 mg/m3
• Propylene115071 | | Propylene | (h) | --
• Propylene dichloridePropylene dichloride | 78-87-5 | 75 | 350 | - |
• Propylene glycol dinitrateNIOSH REL TWA 0.05 ppm (0.3 mg/m3) [skin]
• Propylene glycol monomethyl ether107982 | S | Propylene glycol monomethyl ether | 100 | 360 | | 150 | 540
• Propylene glycol monomethyl ether acetate108656 | S | Propylene glycol monomethyl ether acetate | 100 | 541 | | 150 | 811
• Propylene iminePropylene imine | 75-55-8 | 2 | 5 | X |
• Propylene oxidePropylene oxide | 75-56-9 | 100 | 240 | - |
• PyrethrumPyrethrum | 8003-34-7 | - | 5 | - |
• PyridinePyridine | 110-86-1 | 5 | 15 | - |
• Quartz,14808607 | | Quartz, | -- | 0.05
• QuinoneQuinone | 106-51-4 | 0.1 | 0.4 | - |
• Refractory ceramic fiberRefractory ceramic fiber | | 0.2 f/cc(q)
• Resorcinol108463 | | Resorcinol | 10 | 45 | | 20 | 90
• Rhodium (as Rh), metal fume and insoluble compoundsRhodium (as Rh), metal fume and insoluble compounds | 7440-16-6 | - | 0.1 | - |
• Rhodium (as Rh), soluble compoundsRhodium (as Rh), soluble compounds | 7440-16-6 | - | 0.001 | - |
• Rhodium, metal7440166 | | Rhodium, metal | -- | 0.1
• Rhodium (metal fume and insoluble compounds, as Rh)NIOSH REL TWA 0.1 mg/m3
• RonnelRonnel | 299-84-3 | - | 15 | - |
• Rosin core solder, pyrolysis products, as formaldehydeRosin core solder, pyrolysis products, as formaldehyde | -- | 0.1
• RotenoneRotenone | 83-79-4 | - | 5 | - |
• Rubber solvent (Naphtha)Rubber solvent (Naphtha) | 400 | 1,600
• sec-Amyl acetatesec-Amyl acetate | 626-38-0 | 125 | 650 | - |
• sec-Butyl acetatesec-Butyl acetate | 105-46-4 | 200 | 950 | - |
• sec-Butyl alcoholsec-Butyl alcohol | 78-92-2 | 150 | 450 | - |
• sec-Hexyl acetatesec-Hexyl acetate | 108-84-9 | 50 | 300 | - |
• SeleniumNIOSH REL TWA 0.2 mg/m3
• Selenium hexafluoride7783791 | | Selenium hexafluoride | 0.05 | 0.4
• Silica, amorphousNIOSH REL TWA 6 mg/m3
• Silica, amorphous Diatomaceous earth61790532 | | Silica, amorphous Diatomaceous earth
• Silica, amorphous, precipitated and gelSilica, amorphous, precipitated and gel | 112926-00-8 | - | (3) | - |
• Silica, fused, respirable dustSilica, fused, respirable dust | 60676-86-0 | - | (3) | - |
• SiliconSilicon | 7440-21-3 | - | - | - |
• Silicon carbideSilicon carbide | 409-21-2 | - | - | - |
• Silicon tetrahydrideNIOSH REL TWA 5 ppm (7 mg/m3)
• Silver, metal and soluble compounds (as Ag)Silver, metal and soluble compounds (as Ag) | 7440-22-4 | - | 0.01 | - |
• Silver, soluble compounds, as AgSilver, soluble compounds, as Ag | -- | 0.01
• Soapstone, respirable dustSoapstone, respirable dust | -- | 3
• Soapstone, total dustSoapstone, total dust | -- | 6
• Sodium aluminum fluoride (as F)NIOSH REL TWA 2.5 mg/m3
• Sodium azide26628228 | S | Sodium azide | 0.1 | 0.3 | C
• Sodium bisulfite7631905 | | Sodium bisulfite | -- | 5
• Sodium cyanide (as CN)NIOSH REL C 5 mg/m3 (4.7 ppm) [10-minute]
• Sodium fluoride (as F)NIOSH REL TWA 2.5 mg/m3
• Sodium fluoroacetateSodium fluoroacetate | 62-74-8 | - | 0.05 | X |
• Sodium hydroxideSodium hydroxide | 1310-73-2 | - | 2 | - |
• Sodium metabisulfite7681574 | | Sodium metabisulfite | -- | 5
• Sodium stearate822162 | | Sodium stearate | -- | 10
• StarchStarch | 9005-25-8 | - | - | - |
• StibineStibine | 7803-52-3 | 0.1 | 0.5 | - |
• Stoddard solventStoddard solvent | 8052-41-3 | 500 | 2900 | - |
• Strontium chromate, as Cr (see also Sections 1532.2, 5206 & 8359) Stearates; see specific compound7789062 | | Strontium chromate, as Cr (see also Sections 1532.2, 5206 & 8359) Stearates; see specific compound | -- | 0.0005
• StrychnineStrychnine | 57-24-9 | - | 0.15 | - |
• StyreneStyrene | 100-42-5 | - | (2) | - |
• SubtilisinsNIOSH REL ST 0.00006 mg/m3 [60-minute]
• Subtilisins (as pure crystalline proteolytic enzymes)9014011 | | Subtilisins (as pure crystalline proteolytic enzymes) | -- | | | | 0.00006(r)
• SuccinonitrileNIOSH REL TWA 6 ppm (20 mg/m3)
• SucroseSucrose | 57-50-1 | - | - | - |
• Sulfometuron methyl74222972 | | Sulfometuron methyl | -- | 3.5
• Sulfotep; tetraethyl dithionopyrophosphate3689245 | S | Sulfotep; tetraethyl dithionopyrophosphate | | 0.2
• Sulfur dioxideSulfur dioxide | 7446-09-5 | 5 | 13 | - |
• Sulfur hexafluorideSulfur hexafluoride | 2551-62-4 | 1000 | 6000 | - |
• Sulfur monochlorideSulfur monochloride | 10025-67-9 | 1 | 6 | - |
• Sulfur pentafluorideSulfur pentafluoride | 5714-22-7 | 0.025 | 0.25 | - |
• Sulfur tetrafluoride7783600 | | Sulfur tetrafluoride | 0.1 | 0.4 | C
• Sulfuric acidSulfuric acid | 7664-93-9 | - | 1 | - |
• Sulfuryl fluorideSulfuryl fluoride | 2699-79-8 | 5 | 20 | - |
• Sulprofos35400432 | | Sulprofos | | 1
• Talc (containing no asbestos and less than 1% quartz)NIOSH REL TWA 2 mg/m3 (resp)
• Tantalum, metal and oxide dustTantalum, metal and oxide dust | 7440-25-7 | - | 5 | - |
• Tantalum oxide dust, as Ta1314610 | | Tantalum oxide dust, as Ta | -- | 5
• TelluriumNIOSH REL TWA 0.1 mg/m3
• Tellurium hexafluoride7783804 | | Tellurium hexafluoride | 0.02 | 0.2
• TemephosTemephos | 3383-96-8 | - | - | - |
• TEPPNIOSH REL TWA 0.05 mg/m3 [skin]
• Terephthalic acid100210 | | Terephthalic acid | -- | 10
• TerphenylsTerphenyls | 26140-60-3 | (C)1 | (C)9 | - |
• tert-Amyl acetate; see Pentyl acetate625161 | | tert-Amyl acetate; see Pentyl acetate
• tert-Butyl acetatetert-Butyl acetate | 540-88-5 | 200 | 950 | - |
• tert-Butyl alcoholtert-Butyl alcohol | 75-65-0 | 100 | 300 | - |
• tert-Butyl chromateNIOSH REL Ca TWA 0.001 mg Cr(VI)/m3 See Appendix A See Appendix C
• TetrachloronaphthaleneTetrachloronaphthalene | 1335-88-2 | - | 2 | X |
• Tetraethyl lead (as Pb)Tetraethyl lead (as Pb) | 78-00-2 | - | 0.075 | X |
• TetrahydrofuranTetrahydrofuran | 109-99-9 | 200 | 590 | - |
• Tetramethyl lead (as Pb)Tetramethyl lead (as Pb) | 75-74-1 | - | 0.075 | X |
• Tetramethyl succinonitrileTetramethyl succinonitrile | 3333-52-6 | 0.5 | 3 | X |
• TetranitromethaneTetranitromethane | 509-14-8 | 1 | 8 | - |
• Tetrasodium pyrophosphate7722885 | | Tetrasodium pyrophosphate | -- | 5
• TetrylNIOSH REL TWA 1.5 mg/m3 [skin]
• Thallium, soluble compounds (as Tl)Thallium, soluble compounds (as Tl) | 7440-28-0 | - | 0.1 | X |
• Thioglycolic acid68111 | S | Thioglycolic acid | 1 | 3.8
• Thionyl chloride7719097 | | Thionyl chloride | 1 | 5 | C
• ThiramThiram | 137-26-8 | - | 5 | - |
• TinNIOSH REL TWA 2 mg/m3
• Tin(II) oxide (as Sn)NIOSH REL TWA 2 mg/m3
• Tin, inorganic compounds (except oxides) (as Sn)Tin, inorganic compounds (except oxides) (as Sn) | 7440-31-5 | - | 2 | - |
• Tin(IV) oxide (as Sn)NIOSH REL TWA 2 mg/m3
• Tin, organic compounds (as Sn)Tin, organic compounds (as Sn) | 7440-31-5 | - | 0.1 | - |
• Titanium dioxideTitanium dioxide | 13463-67-7 | - | - | - |
• TolueneToluene | 108-88-3 | - | (2) | - |
• Toluene-2,4-diisocyanateNIOSH REL Ca See Appendix A
• ToluenediamineNIOSH REL Ca (all isomers) See Appendix A
• Tremolite (containing no asbestos fibers), respirable dustTremolite (containing no asbestos fibers), respirable dust | -- | 2
• Tributyl phosphateTributyl phosphate | 126-73-8 | - | 5 | - |
• Trichloroacetic acid76039 | | Trichloroacetic acid | 1 | 5
• TrichloroethyleneTrichloroethylene | 79-01-6 | - | (2) | - |
• TrichloronaphthaleneTrichloronaphthalene | 1321-65-9 | - | 5 | X |
• Tridymite,15468323 | | Tridymite, | -- | 0.05
• Triethanolamine102716 | | Triethanolamine | -- | 5
• TriethylamineTriethylamine | 121-44-8 | 25 | 100 | - |
• Triethylene glycol dimethyl ether, Triglyme112492 | S | Triethylene glycol dimethyl ether, Triglyme | 5 | 36
• TrifluorobromomethaneTrifluorobromomethane | 75-63-8 | 1000 | 6100 | - |
• Trimellitic anhydride552307 | | Trimellitic anhydride | 0.005 | 0.04 | C
• Trimethyl phosphite121459 | | Trimethyl phosphite | 2 | 10
• Trimethylamine75503 | | Trimethylamine | 5 | 12 | | 15 | 36
• Trimethylbenzene, all isomersTrimethylbenzene, all isomers | 25 | 125
• Triorthocresyl phosphateTriorthocresyl phosphate | 78-30-8 | - | 0.1 | - |
• Triphenyl phosphateTriphenyl phosphate | 115-86-6 | - | 3 | - |
• Triphenylamine603349 | | Triphenylamine | -- | 5
• Tripoli, (as quartz)1317959 | | Tripoli, (as quartz) | -- | 0.05
• TungstenNIOSH REL TWA 5 mg/m3 ST 10 mg/m3
• Tungsten carbide (cemented)NIOSH REL See Appendix C
• Tungsten, insoluble compounds, as WTungsten, insoluble compounds, as W | -- | 5 | | -- | 10
• Tungsten, soluble compounds, as WTungsten, soluble compounds, as W | -- | 1 | | -- | 3
• TurpentineTurpentine | 8006-64-2 | 100 | 560 | - |
• Uranium (as U)Uranium (as U) | 7440-61-1 | - | - | - |
• Uranium (natural), insoluble compounds, as UUranium (natural), insoluble compounds, as U | -- | 0.2 | | -- | 0.6
• Uranium (natural), soluble compounds, as UUranium (natural), soluble compounds, as U | -- | 0.05
• VanadiumVanadium | 1314-62-1 | - | - | - |
• Vegetable oil mistNIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)
• Vinyl acetate108054 | | Vinyl acetate | 10 | 30 | | 15 | 45
• Vinyl bromideNIOSH REL Ca See Appendix A
• Vinyl chlorideNIOSH REL Ca See Appendix A
• Vinyl cyclohexene dioxide106876 | S | Vinyl cyclohexene dioxide | 0.1 | 0.57
• Vinyl fluoride75025 | | Vinyl fluoride | 0.2 | 0.38
• Vinyl tolueneVinyl toluene | 25013-15-4 | 100 | 480 | - |
• Vinylidene chlorideNIOSH REL Ca See Appendix A
• Vinylidene fluoride75387 | | Vinylidene fluoride | 100 | 262
• VM & P NaphthaNIOSH REL TWA 350 mg/m3 C 1800 mg/m3 [15-minute]
• WarfarinWarfarin | 81-81-2 | - | 0.1 | - |
• Welding fumes; total particulates (see also individual constituents)Welding fumes; total particulates (see also individual constituents) | -- | 5
• Wood dust, Western red cedarWood dust, Western red cedar | -- | 0.5
• Xylene; xylol; dimethylbenzene1330207 | | Xylene; xylol; dimethylbenzene | 100 | 435 | 300 ppm | 150 | 655
• XylidineXylidine | 1300-73-8 | 5 | 25 | X |
• YttriumYttrium | 7440-65-5 | - | 1 | - |
• Yttrium compounds, as YYttrium compounds, as Y | -- | 1
• Zinc chloride fumeZinc chloride fume | 7646-85-7 | - | 1 | - |
• Zinc chromate, as Cr13530659 | | Zinc chromate, as Cr | -- | 0.005
• Zinc chromate hydroxide, as Cr15930946 | | Zinc chromate hydroxide, as Cr | -- | 0.005
• Zinc oxideZinc oxide | 1314-13-2 | - | - | - |
• Zinc oxide fumeZinc oxide fume | 1314-13-2 | - | 5 | - |
• Zinc potassium chromate, as Cr11103869 | | Zinc potassium chromate, as Cr | -- | 0.005
• Zinc stearateZinc stearate | 557-05-1 | - | - | - |

← records 1–400 · All of US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side · records 801 on →