R 325.51108 Tables.

Rule 8. Tables G-1-A and G-2 read as follows: TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Abate – 15 – – – – – Acetaldehyde 75-07-0 100 180 150 270 – – – Acetic acid 64-19-7 10 25 – – – – – Acetic anhydride 108-24-7 – – – – 5 20 – Acetone 67-64-1 750 1800 1000 2400 – – – Acetonitrile 75-05-8 40 70 60 105 – – – 2-Acetylaminofluorine; see GI Part 350. CarcinogensF 53-96-3 Acetylene dichloride; see 1,2-Dichloroethylene Acetylene tetrabromide 79-27-6 1 14 – – – – – Acetylsalicylic acid (Aspirin) 50-78-2 – 5 – – – – – Acrolein 107-02-8 0.1 0.25 0.3 0.8 – – – Acrylamide 79-06-1 – 0.03 – – – – x Acrylic acid 79-10-7 10 30 – – – – x Acrylonitrile; see GI & CS Part 307. AcrylonitrileF 107-13-1 2 4.34 10 21.7 TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Aldrin 309-00-2 – 0.25 – – – – x Allyl alcohol 107-18-6 2 5 4 10 – – x Allyl chloride 107-05-1 1 3 2 6 – – – Allyl glycidyl ether (AGE) 106-92-3 5 22 10 44 – – – Allyl propyl disulfide 2179-59-1 2 12 3 18 – – – α Alumina (aluminum oxide) Respirable fraction Total dust 1344-28-1 – – 5 10 – – – – – – – – – – Aluminum (as Al) Alkyls Metal Respirable dust Total dust Pyro powders Soluble salts Welding fumes* 7429-90-5 – – – – – – – 2 5 15 5 2 5 – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 4-Aminodiphenyl; see GI Part 350. CarcinogensF 92-67-1 2-Aminoethanol; see Ethanolamine 2-Aminopyridine 504-29-0 0.5 2 – – – – – Amitrole 61-82-5 – 0.2 – – – – – Ammonia 7664-41-7 – – 35 24 – – – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Ammonium chloride fume 12125-02-9 – 10 – 20 – – – Ammonium sulfamate Respirable dust Total dust 7773-06-0 – – 5 10 – – – – – – – – – – n-Amyl acetate 628-63-7 100 525 – – – – – sec-Amyl acetate 626-38-0 125 650 – – – – – Aniline and homologues 62-53-3 2 8 – – – – x Anisidine (o- and p-isomers) 29191-52-4 – 0.5 – – – – x Antimony and compounds (as Sb) 7440-36-0 – 0.5 – – – – – ANTU (alpha-naphthylthiourea) 86-88-4 – 0.3 – – – – – Arsenic, organic compounds (as As) 7440-38-2 – 0.5 – – – – – Arsenic, inorganic compounds (as As); see GI & CS Part 308. Inorganic ArsenicF 7440-38-2 0.01 Arsine 7784-42-1 0.05 0.2 – – – – – TWA STELD Asbestos; see OH Part 305. Asbestos for General IndustryF Varies 0.1f/cc – ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Atrazine 1912-24-9 – 5 – – – – – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Azinphos-methyl 86-50-0 – 0.2 – – – – x Barium, soluble compounds (as Ba) 7440-39-3 – 0.5 – – – – – Barium sulfate Respirable dust Total dust 7727-43-7 – – 5 10 – – – – – – – – – – Benomyl Respirable dust Total dust 17804-35-2 – – 5 10 – – – – – – – – – – BenzeneE; see GI & CS Part 311. BenzeneF and table G-2 for limits applicable in the operations or sectors excluded in R 325.77101E 71-43-2 1 3.19 5 15.97 Benzidine; see GI Part 350. CarcinogensF 92-87-5 p-Benzoquinone; see Quinone Benzo(a)pyrene; see Coal tar pitch volatiles Benzoyl peroxide 94-36-0 – 5 – – – – – Benzyl chloride 100-44-7 1 5 – – – – – Beryllium and beryllium compounds (as Be) see GI Part 340. Beryllium 7440-41-7 – 0.0002 (0.2 μg/m3) – 0.002 (2.0 μg/m3) – – – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Biphenyl; see Diphenyl Bismuth telluride, Undoped Respirable dust Total dust 1304-82-1 – – 5 15 – – – – – – – – – – Bismuth telluride, Se-doped – 5 – – – – – Borates, Tetra, Sodium Salts Anhydrous Decahydrate Pentahydrate 1330-43-4 1303-96-4 12179-04-3 – – – 10 10 10 – – – – – – – – – – – – – – – Boron oxide, Total dust 1303-86-2 – 10 – – – – – Boron tribromide 10294-33-4 – – – – 1 10 – Boron trifluoride 7637-07-2 – – – – 1 3 – Bromacil 314-40-9 1 10 – – – – – Bromine 7726-95-6 0.1 0.7 0.3 2 – – – Bromine pentafluoride 7789-30-2 0.1 0.7 – – – – – Bromoform 75-25-2 0.5 5 – – – – – 1,3-Butadiene; see OH Part 312. 1,3-ButadieneF 106-99-0 1 2.2 5 11.1 – – – Butane 106-97-8 800 1900 – – – – – Butanethiol; see Butyl mercaptan TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation 2-Butanone (Methyl ethyl ketone) 78-93-3 200 590 300 885 – – – 2-Butoxyethanol 111-76-2 25 120 – – – – x n-Butyl acetate 123-86-4 150 710 200 950 – – – sec-Butyl acetate 105-46-4 200 950 – – – – – tert-Butyl acetate 540-88-5 200 950 – – – – – Butyl acrylate 141-32-2 10 55 – – – – – n–Butyl alcohol (n-butanol) 71-36-3 – – – – 50 150 x sec-Butyl alcohol (sec-butanol) 78-92-2 100 305 – – – – – tert-Butyl alcohol (tert-butanol) 75-65-0 100 300 150 450 – – – Butylamine 109-73-9 – – – – 5 15 x tert-Butyl chromate (as Cr+6); see OH Part 315. Chromium (VI) in General IndustryF,G 1189-85-1 – 0.005 (5 μg/m3) – – – – x n-Butyl glycidyl ether (BGE) 2426-08-6 25 135 – – – – – n-Butyl lactate 138-22-7 5 25 – – – – – Butyl mercaptan 109-79-5 0.5 1.5 – – – – – o-sec-Butylphenol 89-72-5 5 30 – – – – x p-tert-Butyltoluene 98-51-1 10 60 20 120 – – – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Cadmium; see GI Part 309. Cadmium in General IndustryF 7440-43-9 – 0.005 – – – – – Calcium carbonate, Respirable dust Total dust 1317-65-3 – – 5 15 – – – – – – – – – – Calcium cyanamide 156-62-7 – 0.5 – – – – – Calcium hydroxide 1305-62-0 – 5 – – – – – Calcium oxide 1305-78-8 – 5 – – – – – Calcium silicate, Respirable dust Total dust 1344-95-2 – – 5 15 – – – – – – – – – – Calcium sulfate, Respirable dust Total dust 7778-18-9 – – 5 15 – – – – – – – – – – Camphor, synthetic 76-22-2 – 2 – – – – – Caprolactam, Dust Vapor 105-60-2 – 5 1 20 – 10 3 40 – – – – – – Captafol (DifolatanR) 2425-06-1 – 0.1 – – – – – Captan 133-06-2 – 5 – – – – – Carbaryl (SevinR) 63-25-2 – 5 – – – – – Carbofuran (FuradanR) 1563-66-2 – 0.1 – – – – – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Carbon black 1333-86-4 – 3.5 – – – – – Carbon dioxide 124-38-9 5,000 9,000 30,00 0 54,000 – – – Carbon disulfide 75-15-0 4 12 12 36 – – x Carbon monoxide 630-08-0 35 40 – – 200 229 – Carbon tetrabromide 558-13-4 0.1 1.4 0.3 4 – – – Carbon tetrachloride (Tetrachloromethane) 56-23-5 2 12.6 – – – – x Carbonyl fluoride 353-50-4 2 5 5 15 – – – Catechol (Pyrocatechol) 120-80-9 5 20 – – – – x Cellulose, Respirable dust Total dust 9004-34-6 – – 5 15 – – – – – – – – – – Cesium hydroxide 21351-79-1 – 2 – – – – – Chlordane 57-74-9 – 0.5 – – – – x Chlorinated camphene (Toxaphone) 8001-35-2 – 0.5 – 1 – – x Chlorinated diphenyl oxide 55720-99-5 or 31242-93-0 – 0.5 – – – – – Chlorine 7782-50-5 0.5 1.5 1 3 – – – Chlorine dioxide 10049-04-4 0.1 0.3 0.3 0.9 – – – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Chlorine trifluoride 7790-91-2 – – – – 0.1 0.4 – Chloroacetaldehyde 107-20-0 – – – – 1 3 – 2-Chloroacetophenone (Phenacyl chloride) 532-27-4 0.5 0.3 – – – – – Chloroacetyl chloride 79-04-9 0.5 0.2 – – – – – Chlorobenzene 108-90-7 75 350 – – – – – o-Chlorobenzylidene malononitrile 2698-41-1 – – – – 0.05 0.4 x Chlorobromomethane 74-97-5 200 1050 – – – – – 2-Chloro-1,3-butadiene; see β-Chloroprene Chlorodifluoromethane 75-45-6 1000 3500 – – – – – Chlorodiphenyl (42% Chlorine) (PCB) 53469-21-9 – 1 – – – – x Chlorodiphenyl (54% Chlorine) (PCB) 11097-69-1 – 0.5 – – – – x 1-Chloro-2,3-epoxy propane; see Epichlorohydrin 2-Chloroethanol; see Ethylene chlorohydrin Chloroethylene; see Vinyl chloride Chloroform (Trichloromethane) 67-66-3 2 9.78 – – – – – bis (Chloromethyl) ether; GI Part 350. CarcinogensF 542-88-1 TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Chloromethyl methyl ether; see GI Part 350. CarcinogensF 107-30-2 1-Chloro-1-nitropropane 600-25-9 4 10 – – – – – Chloropentafluoroethane 76-15-3 1000 6320 – – – – – Chloropicrin 76-06-2 0.1 0.7 – – – – – beta-Chloroprene 126-99-8 10 35 – – – – x o-Chlorostyrene 2039-87-4 50 285 75 428 – – – o-Chlorotoluene 95-49-8 50 250 – – – – – 2-Chloro-6-(trichloromethyl) pyridine, Respirable dust Total dust 1929-82-4 – – 5 15 – – – – – – – – – – Chlorpyrifos 2921-88-2 – 0.2 – – – – x Chromic acid and chromates (as Cr+6); see OH Part 315. Chromium (VI) in General IndustryF,G Varies with compound – 0.005 (5 μg/m3) – – – – – Chromium (II) compounds (as Cr) 7440-47-3 – 0.5 – – – – – Chromium (III) compounds (as Cr) 7440-47-3 – 0.5 – – – – – Chromium (VI) compounds; see OH Part 315. Chromium (VI) in General IndustryF,G Varies with compound (5 μg/m3) Chromium metal (as Cr) 7440-47-3 – 1 – – – – – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Chrysene; see Coal tar pitch volatile Clopidol Respirable dust Total dust 2971-90-6 – – 5 15 – – – – – – – – – – Coal dust (less than 5% SiO2) Respirable dust – – 2 – – – – – Coal dust (greater than or equal to 5% SiO2), Respirable dust – – 0.1 – – – – – Coal tar pitch volatile (as benzene solubles) anthracene, BaP, phenanthrene, acridine, crysene, pyrene 65996-93-2 – 0.2 – – – – – Cobalt metal, dust, and fume (as Co) 7440-48-4 – 0.05 – – – – – Cobalt carbonyl (as Co) 10210-68-1 – 0.1 – – – – – Cobalt hydrocarbonyl (as Co) 16842-03-8 – 0.1 – – – – – Coke oven emissions; see GI & CS Part 314. Coke Oven EmissionsF – – 0.15 (150 μg/m3) – – – – – Copper, Dusts and mists (as Cu) Fume (as Cu) 7440-50-8 – – 1 0.1 – – – – – – – – – – Cotton dust (raw) – – 1 – – – – – Crag herbicide (Sesone) Total dust Respirable fraction 136-78-7 – – 10 5 – – – – – – – – – – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Cresol, all isomers 1319-77-3 5 22 – – – – x Crotonaldehyde 123-73-9 4170-30-3 2 6 – – – – – Crufomate 299-86-5 – 5 – – – – – Cumene 98-82-8 50 245 – – – – x Cyanamide 420-04-2 – 2 – – – – – Cyanides (as CN) Varies with compound – 5 – – – – x Cyanogen 460-19-5 10 20 – – – – – Cyanogen chloride 506-77-4 – – – – 0.3 0.6 – Cyclohexane 110-82-7 300 1050 – – – – – Cyclohexanol 108-93-0 50 200 – – – – x Cyclohexanone 108-94-1 25 100 – – – – x Cyclohexene 110-83-8 300 1015 – – – – – Cyclohexylamine 108-91-8 10 40 – – – – – Cyclonite 121-82-4 – 1.5 – – – – x Cyclopentadiene 542-92-7 75 200 – – – – – Cyclopentane 287-92-3 600 1720 – – – – – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Cyhexatin 13121-70-5 – 5 – – – – – 2,4-D (Dichlorophenoxyacetic acid) 94-75-7 – 10 – – – – – Decaborane 17702-41-9 0.05 0.3 0.15 0.9 – – x Demeton (SystoxR) 8065-48-3 – 0.1 – – – – x Diacetone alcohol (4-Hydroxy-4-methyl-2-pentanone) 123-42-2 50 240 – – – – – 1,2-Diaminoethane; see Ethylenediamine Diazinon 333-41-5 – 0.1 – – – – x Diazomethane 334-88-3 0.2 0.4 – – – – – Diborane 19287-45-7 0.1 0.1 – – – – – 2-N-Dibutylaminoethanol 102-81-8 2 14 – – – – – Dibutyl phosphate 107-66-4 1 5 2 10 – – – Dibutyl phthalate 84-74-2 – 5 – – – – – Dichloroacetylene 7572-29-4 – – – – 0.1 0.4 – o-Dichlorobenzene 95-50-1 – – – – 50 300 – p-Dichlorobenzene 106-46-7 75 450 110 675 – – – 3,3'-Dichlorobenzidine; see GI Part 350. CarcinogensF 91-94-1 TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Dichlorodifluoromethane 75-71-8 1000 4950 – – – – – 1,3-Dichloro-5,5-dimethyl hydantoin 118-52-5 – 0.2 – 0.4 – – – Dichlorodiphenyltri-chloroethane (DDT) 50-29-3 – 1 – – – – x 1,1-Dichloroethane 75-34-3 100 400 – – – – – 1,2-Dichloroethylene 540-59-0 200 790 – – – – – Dichloroethyl ether 111-44-4 5 30 10 60 – – x Dichlorofluoromethane 75-43-4 10 40 – – – – – Dichloromethane; see Methylene chloride 1,1-Dichloro-1-nitroethane 594-72-9 2 10 – – – – – 1,2-Dichloropropane; see Propylene dichloride 1,3-Dichloropropene 542-75-6 1 5 – – – – x 2,2-Dichloropropionic acid 75-99-0 1 6 – – – – – Dichlorotetrafluoroethane 76-14-2 1000 7000 – – – – – Dichlorvos (DDVP) 62-73-7 – 1 – – – – x Dicrotophos 141-66-2 – 0.25 – – – – x Dicyclopentadiene 77-73-6 5 30 – – – – – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Dicyclopentadienyl iron, Respirable dust Total dust 102-54-5 – – 5 10 – – – – – – – – – – Dieldrin 60-57-1 – 0.25 – – – – x Diethanolamine 111-42-2 3 15 – – – – – Diethylamine 109-89-7 10 30 25 75 – – – 2-Diethylaminoethanol 100-37-8 10 50 – – – – x Diethylene triamine 111-40-0 1 4 – – – – x Diethyl ether; see Ethyl ether Diethyl ketone 96-22-0 200 705 – – – – – Diethyl phthalate 84-66-2 – 5 – – – – – Difluorodibromomethane 75-61-6 100 860 – – – – – Diglycidyl ether (DGE) 2238-07-5 0.1 0.5 – – – – – Dihydroxybenzene; see Hydroquinone Diisobutyl ketone 108-83-8 25 150 – – – – – Diisopropylamine 108-18-9 5 20 – – – – x 4-Dimethylaminoazobenzene; see GI Part 350. CarcinogensF 60-11-7 Dimethoxymethane; see Methylal TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Dimethyl acetamide 127-19-5 10 35 – – – – x Dimethylamine 124-40-3 10 18 – – – – – Dimethylaminobenzene; see Xylidine Dimethylaniline (N,N-Dimethylaniline) 121-69-7 5 25 10 50 – – x Dimethylbenzene; see Xylene Dimethyl-1,2-dibromo-2,2-dichloroethyl phosphate 300-76-5 – 3 – – – – x Dimethylformamide 68-12-2 10 30 – – – – x 2,6-Dimethyl-4-heptanone; see Diisobutyl ketone 1,1-Dimethylhydrazine 57-14-7 0.5 1 – – – – x Dimethylphthalate 131-11-3 – 5 – – – – – Dimethyl sulfate 77-78-1 0.1 0.5 – – – – x Dinitolmide (3,5-Dinitro-o-toluamide) 148-01-6 – 5 – – – – – Dinitrobenzene (all isomers) (meta-) (ortho) (para-) 99-65-0 528-29-0 100-25-4 – 1 – – – – x Dinitro-o-cresol 534-52-1 – 0.2 – – – – x Dinitrotoluene 25321-14-6 – 1.5 – – – – x TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Dioxane (Diethylene dioxide) 123-91-1 25 90 – – – – x Dioxathion (Delnav) 78-34-2 – 0.2 – – – – x Diphenyl (Biphenyl) 92-52-4 0.2 1 – – – – – Diphenylamine 122-39-4 – 10 – – – – – Diphenylmethane diisocyanate; see Methylene bisphenyl isocyanate Dipropylene glycol methyl ether 34590-94-8 100 600 150 900 – – x Dipropyl ketone 123-19-3 50 235 – – – – – Diquat 2768-72-9 – 0.5 – – – – – Di-sec-octyl phthalate [Di(2-ethylhexyl) phthalate] 117-81-7 – 5 – 10 – – – Disulfiram 97-77-8 – 2 – – – – – Disulfoton 298-04-4 – 0.1 – – – – x 2,6-Di-tert-butyl-p-cresol (Butylated hydroxytoluene) 128-37-0 – 10 – – – – – Diuron 330-54-1 – 10 – – – – – Divinyl benzene 1321-74-0 10 50 – – – – – Emery, Respirable dust Total dust 1302-74-5 – – 5 10 – – – – – – – – – – Endosulfan 115-29-7 – 0.1 – – – – x TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Endrin 72-20-8 – 0.1 – – – – x Epichlorohydrin 106-89-8 2 8 – – – – x EPN 2104-64-5 – 0.5 – – – – x 1,2-Epoxypropane; see Propylene oxide 2,3-Epoxy-1-propanol; see Glycidol Ethanethiol; see Ethyl mercaptan Ethanolamine 141-43-5 3 8 6 15 – – – Ethion 563-12-2 – 0.4 – – – – x 2-Ethoxyethanol (EGEE) 110-80-5 200 740 – – – – x 2-Ethoxyethyl acetate (Cellosolve acetate) 111-15-9 100 540 – – – – x Ethyl acetate 141-78-6 400 1400 – – – – – Ethyl acrylate 140-88-5 5 20 25 100 – – x Ethyl alcohol (Ethanol) 64-17-5 1000 1900 – – – – – Ethylamine 75-04-7 10 18 – – – – – Ethyl amyl ketone (5-Methyl-3-heptanone) 541-85-5 25 130 – – – – – Ethyl benzene 100-41-4 100 435 125 545 – – – Ethyl bromide 74-96-4 200 890 250 1100 – – – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Ethyl butyl ketone (3-Heptanone) 106-35-4 50 230 – – – – – Ethyl chloride 75-00-3 1000 2600 – – – – – Ethyl ether 60-29-7 400 1200 500 1500 – – – Ethyl formate 109-94-4 100 300 – – – – – Ethyl mercaptan 75-08-1 0.5 1 – – – – – Ethyl silicate 78-10-4 10 85 – – – – – Ethylene chlorohydrin 107-07-3 – – – – 1 3 x Ethylenediamine 107-15-3 10 25 – – – – – Ethylene dibromide 106-93-4 See table G-2 Ethylene dichloride 107-06-2 1 4 2 8 – – – Ethylene glycol 107-21-1 – – – – 50 125 – Ethylene glycol dinitrate (EGDN) 628-96-6 – – – 0.1 – – x Ethylene glycol methyl acetate (EGME); see Methyl cellosolve acetate Ethyleneimine; see GI Part 350. CarcinogensF 151-56-4 Ethylene oxide; see GI & CS Part 304. Ethylene OxideF 75-21-8 1 1.8 5 9.0 - - - Ethylidene chloride; see 1,1-Dichloroethane TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Ethylidene norbornene 16219-75-3 – – – – 5 25 – N-Ethylmorpholine 100-74-3 5 23 – – – – x Fenamiphos 22224-92-6 – 0.1 – – – – x Fensulfothion (Dasanit) 115-90-2 – 0.1 – – – – – Fenthion 55-38-9 – 0.2 – – – – x Ferbam, Dust 14484-64-1 – 10 – – – – – Ferrovanadium dust 12604-58-9 – 1 – 3 – – – Fluorides (as F) Varies with compound – 2.5 – – – – – Fluorine 7782-41-4 0.1 0.2 – – – – – Fluorotrichloromethane (Trichlorofluoromethane) 75-69-4 – – – – 1000 5600 – Fonofos 944-22-9 – 0.1 – – – – x Formaldehyde; see GI & CS Part 306. FormaldehydeF 50-00-0 0.75 0.9 2 2.5 Formamide 75-12-7 20 30 30 45 – – – Formic acid 64-18-6 5 9 – – – – – Furfural 98-01-1 2 8 – – – – x Furfuryl alcohol 98-00-0 10 40 15 60 – – x TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Gasoline 8006-61-9 300 900 500 1500 – – – Germanium tetrahydride 7782-65-2 0.2 0.6 – – – – – Glutaraldehyde 111-30-8 – – – – 0.2 0.8 – Glycerin, Respirable mist Total mist 56-81-5 – – 5 10 – – – – – – – – – – Glycidol 556-52-5 25 75 – – – – – Glycol monoethyl ether; see 2-Ethoxyethanol Grain dust (Oat, wheat, barley) – – 10 – – – – – Graphite, natural Respirable dust 7782-42-5 – 2.5 – – – – – Graphite, synthetic, Respirable dust Total dust – – – 5 10 – – – – – – – – – – GuthionR; see Azinphos methyl Gypsum, Respirable dust Total dust 13397-24-5 – – 5 15 – – – – – – – – – – Hafnium 7440-58-6 – 0.5 – – – – – Heptachlor 76-44-8 – 0.5 – – – – x Heptane (n-Heptane) 142-82-5 400 1600 500 2000 – – – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Hexachlorobutadiene 87-68-3 – 0.02 0.24 – – – – Hexachlorocyclopentadiene 77-47-4 0.01 0.1 – – – – – Hexachloroethane 67-72-1 1 10 – – – – x Hexachloronaphthalene 1335-87-1 – 0.2 – – – – x Hexafluoroacetone 684-16-2 0.1 0.7 – – – – x n-Hexane 110-54-3 50 180 – – – – – Hexane isomers Varies with compound 500 1800 1000 3600 – – – 2-Hexanone (Methyl n-butyl ketone) 591-78-6 5 20 – – – – – Hexone (Methyl isobutyl ketone) 108-10-1 50 205 75 300 – – – sec-Hexyl acetate 108-84-9 50 300 – – – – – Hexylene glycol 107-41-5 – – – – 25 125 – Hydrazine 302-01-2 0.1 0.1 – – – – x Hydrogenated terphenyls 61788-32-7 0.5 5 – – – – – Hydrogen bromide 10035-10-6 – – – – 3 10 – Hydrogen chloride 7647-01-0 – – – – 5 7 – Hydrogen cyanide 74-90-8 – – 4.7 5 – – x Hydrogen fluoride (as F) 7664-39-3 3 – 6 – – – – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Hydrogen peroxide 7722-84-1 1 1.4 – – – – – Hydrogen selenide (as Se) 7783-07-5 0.05 0.2 – – – – – Hydrogen sulfide 7783-06-4 10 14 15 21 – – – Hydroquinone 123-31-9 – 2 – – – – – 2-Hydroxypropyl acrylate 999-61-1 0.5 3 – – – – x Indene 95-13-6 10 45 – – – – – Indium and compounds (as In) 7440-74-6 – 0.1 – – – – – Iodine 7553-56-2 – – – – 0.1 1 – Iodoform 75-47-8 0.6 10 – – – – – Iron oxide fume 1309-37-1 – 10 – – – – – Iron pentacarbonyl (as Fe) 13463-40-6 0.1 0.8 0.2 1.6 – – – Iron salts (soluble) (as Fe) Varies with compound – 1 – – – – – Isoamyl acetate 123-92-2 100 525 – – – – – Isoamyl alcohol (primary and secondary) 123-51-3 100 360 125 450 – – – Isobutyl acetate 110-19-0 150 700 – – – – – Isobutyl alcohol 78-83-1 50 150 – – – – – Isooctyl alcohol 26952-21-6 50 270 – – – – x TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Isophorone 78-59-1 4 23 – – – – – Isophorone diisocyanate (IPDI) 4098-71-9 0.005 – 0.02 – – – x 2-Isopropoxyethanol 109-59-1 25 105 – – – – – Isopropyl acetate 108-21-4 250 950 310 1185 – – – Isopropyl alcohol 67-63-0 400 980 500 1225 – – – Isopropylamine 75-31-0 5 12 10 24 – – – N-Isopropylaniline 768-52-5 2 10 – – – – x Isopropyl ether 108-20-3 500 2100 – – – – – Isopropyl glycidyl ether (IGE) 4016-14-2 50 240 75 360 – – – Kaolin, Respirable dust Total dust – – – 5 10 – – – – – – – – – – Ketene 463-51-4 0.5 0.9 1.5 3 – – – Lead inorganic (as Pb); see GI Part 310. Lead in General IndustryF 7439-92-1 – 0.05 (50 μg/m3) – – – – – Limestone, (calcium carbonate) Respirable dust Total dust 1317-65-3 – – 5 15 – – – – – – – – – – Lindane 58-89-9 – 0.5 – – – – x TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Lithium hydride 7580-67-8 – 0.025 – – – – – L.P.G. (Liquified petroleum gas) 68476-85-7 1000 1800 – – – – – Magnesite, Respirable dust Total dust 546-93-0 – – 5 15 – – – – – – – – – – Magnesium oxide fume, Total particulate 1309-48-4 – 10 – – – – – Malathion dust 121-75-5 – 10 – – – – x Maleic anhydride 108-31-6 1 – – – – – – Manganese, Compounds (as Mn) Fume (as Mn) 7439-96-5 – – – 1 – – – 3 – – 5 – – – Manganese cyclopentadienyl tricarbonyl (as Mn) 12079-65-1 – 0.1 – – – – x Manganese tetroxide (as Mn) 1317-35-7 – 1 – – – – – Marble (calcium carbonate), Respirable dust Total dust 1317-65-3 – – 5 15 – – – – – – – – – – Mercury Inorganic and aryl compounds (As Hg) Organic compounds (as Hg) Vapor (as Hg) 7439-97-6 – – – – 0.01 0.05 – – – – 0.03 – – – – 0.1 – – x x x Mesityl oxide 141-79-7 15 60 25 100 – – – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Methacrylic acid 79-41-4 20 70 – – – – x Methanethiol; see Methyl mercaptan Methomyl (Lannate) 16752-77-5 – 2.5 – – – – – Methoxychlor dust 72-43-5 – 10 – – – – – 2-Methoxyethanol; see Methyl cellosolve 4-Methoxyphenol 150-76-5 – 5 – – – – – Methyl acetate 79-20-9 200 610 250 760 – – – Methyl acetylene (Propyne) 74-99-7 1000 1650 – – – – – Methyl acetylene-propadiene mixture (MAPP) – 1000 1800 1250 2250 – – – Methyl acrylate 96-33-3 10 35 – – – – x Methylacrylonitrile 126-98-7 1 3 – – – – x Methylal (Dimethoxymethane) 109-87-5 1000 3100 – – – – – Methyl alcohol 67-56-1 200 260 250 325 – – x Methylamine 74-89-5 10 12 – – – – – Methyl amyl alcohol; see Methyl isobutyl carbinol Methyl n-amyl ketone 110-43-0 100 465 – – – – – Methyl bromide 74-83-9 5 20 – – – – x TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Methyl n-butyl ketone; see 2-Hexanone Methyl cellosolve (2-Methoxyethanol) 109-86-4 25 80 – – – – x Methyl cellosolve acetate (2-Methoxyethyl acetate) 110-49-6 25 120 – – – – x Methyl chloride 74-87-3 50 105 100 210 – – – Methyl chloroform (1,1,1-Trichloroethane) 71-55-6 350 1900 450 2450 – – – Methyl 2-cyanoacrylate 137-05-3 2 8 4 16 – – – Methylcyclohexane 108-87-2 400 1600 – – – – – Methylcyclohexanol 25639-42-3 50 235 – – – – – o-Methylcyclohexanone 583-60-8 50 230 75 345 – – x Methylcyclopentadienyl manganese tricarbonyl (as Mn) 12108-13-3 – 0.2 – – – – x Methyl demeton 8022-00-2 – 0.5 – – – – x 4,4'-Methylene bis(2-chloroaniline) (MBOCA) 101-14-4 0.02 0.22 – – – – x Methylene bis(4-cyclohexylisocyanate) (MCBI) 5124-30-1 – – – – 0.01 0.11 – Methylene bisphenyl isocyanate (MDI) 101-68-8 – – – – 0.02 0.2 – Methylene chloride, see OH Part 313. Methylene ChlorideF 75-09-2 25 87 125 434 TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Methylenedianiline (MDA); see GI Part 303. Methylenedianiline (MDA) in General IndustryF 101-77-9 10 ppb** 0.08 mg/m3 100 ppb** 0.8 mg/m3 – – – Methyl ethyl ketone (MEK); see 2-Butanone Methyl ethyl ketone peroxide (MEKP) 1338-23-4 – – – – 0.7 5 – Methyl formate 107-31-3 100 250 150 375 – – – Methyl hydrazine 60-34-4 – – – – 0.2 0.35 x Methyl iodide 74-88-4 2 10 – – – – x Methyl isoamyl ketone 110-12-3 50 240 – – – – – Methyl isobutyl carbinol 108-11-2 25 100 40 165 – – x Methyl isobutyl ketone; see Hexone Methyl isocyanate (MIC) 624-83-9 0.02 0.05 – – – – x Methyl isopropyl ketone 563-80-4 200 705 – – – – – Methyl mercaptan 74-93-1 0.5 1 – – – – – Methyl methacrylate 80-62-6 100 410 – – – – Methyl parathion 298-00-0 – 0.2 – – – – x Methyl propyl ketone; see 2-Pentanone Methyl silicate 681-84-5 1 6 – – 5 30 – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation alpha-Methyl styrene 98-83-9 50 240 100 485 – – – Metribuzin 21087-64-9 – 5 – – – – – Mica; see Silicates Molybdenum, (as Mo) Insoluble compounds Soluble compounds 7439-98-7 – – 10 5 – – – – – – – – – – Monocrotophos (AzodrinR) 6923-22-4 – 0.25 – – – – – Monomethyl aniline 100-61-8 0.5 2 – – – – x Morpholine 110-91-8 20 70 30 105 – – x Naphtha (Coal tar) 8030-30-6 100 400 – – – – – Naphthalene 91-20-3 10 50 15 75 – – – alpha-Naphthylamine; see GI Part 350. CarcinogensF 134-32-7 beta-Naphthylamine; see GI Part 350. CarcinogensF 91-59-8 Nickel carbonyl (as Ni) 13463-39-3 0.001 0.007 – – – – – Nickel, Metal and insoluble compounds (as Ni) Soluble compounds (as Ni) 7440-02-0 – – 1 0.1 – – – – – – – – – – Nicotine 54-11-5 – 0.5 – – – – x TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Nitric acid 7697-37-2 2 5 4 10 – – – Nitric oxide 10102-43-9 25 30 – – – – – p-Nitroaniline 100-01-6 – 3 – – – – x Nitrobenzene 98-95-3 1 5 – – – – x p-Nitrochlorobenzene 100-00-5 – 1 – – – – x 4-Nitrodiphenyl; see GI Part 350. CarcinogensF 92-93-3 Nitroethane 79-24-3 100 310 – – – – – Nitrogen dioxide 10102-44-0 – – 1 1.8 – – – Nitrogen trifluoride 7783-54-2 10 29 – – – – – Nitroglycerin 55-63-0 – – – 0.1 – – x Nitromethane 75-52-5 100 250 – – – – – 1-Nitropropane 108-03-2 25 90 – – – – – 2-Nitropropane 79-46-9 10 35 – – – – – N-Nitrosodimethylamine; see GI Part 350. CarcinogensF 62-75-9 Nitrotoluene (o-,m-,p-isomers) 99-08-1 2 11 – – – – x Nitrotrichloromethane; see Chloropicrin TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Nonane 111-84-2 200 1050 – – – – – Octachloronaphthalene 2234-13-1 – 0.1 – 0.3 – – x Octane 111-65-9 300 1450 375 1800 – – – Oil mist, mineral 8012-95-1 – 5 – – – – – Osmium tetroxide (as Os) 20816-12-0 – 0.002 – 0.006 – – – Oxalic acid 144-62-7 – 1 – 2 – – – Oxygen difluoride 7783-41-7 – – – – 0.05 0.1 – Ozone 10028-15-6 0.1 0.2 0.3 0.6 – – – Paraffin wax fume 8002-74-2 – 2 – – – – – Paraquat, respirable dust 1910-42-5 2074-50-2 4685-14-7 – 0.1 – – – – x Parathion 56-38-2 – 0.1 – – – – x Particulates not otherwise regulated, Respirable dust Total dust – – – – – 5 15 – – – – – – – – – – Pentaborane 19624-22-7 0.005 0.01 0.015 0.03 – – – Pentachloronaphthalene 1321-64-8 – 0.5 – – – – x Pentachlorophenol 87-86-5 – 0.5 – – – – x TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Pentaerythritol, Respirable dust Total dust 115-77-5 – – 5 10 – – – – – – – – – – Pentane 109-66-0 600 1800 750 2250 – – – 2-Pentanone (Methyl propyl ketone) 107-87-9 200 700 250 875 – – – Perchloroethylene (Tetrachloroethylene) 127-18-4 25 170 – – – – – Perchloromethyl mercaptan 594-42-3 0.1 0.8 – – – – – Perchloryl fluoride 7616-94-6 3 14 6 28 – – – Perlite Respirable dust Total dust 93763-70-3 – – 5 15 – – – – – – – – – – Petroleum distillates (Naphtha) (Rubber solvent) 400 1600 – – – – – Phenol 108-95-2 5 19 – – – – x Phenothiazine 92-84-2 – 5 – – – – x p-Phenylenediamine 106-50-3 – 0.1 – – – – x Phenyl ether, vapor 101-84-8 1 7 – – – – – Phenyl ether-biphenyl mixture, vapor – 1 7 – – – – – Phenylethylene; see Styrene Phenyl glycidyl ether (PGE) 122-60-1 1 6 – – – – – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Phenylhydrazine 100-63-0 5 20 10 45 – – x Phenyl mercaptan 108-98-5 0.5 2 – – – – – Phenylphosphine 638-21-1 – – – – 0.05 0.25 – Phorate 298-02-2 – 0.05 – 0.2 – – x Phosdrin (MevinphosR) 7786-34-7 – 0.1 – 0.3 – – x Phosgene (Carbonyl chloride) 75-44-5 0.1 0.4 – – – – – Phosphine 7803-51-2 0.3 0.4 1 1 – – – Phosphoric acid 7664-38-2 – 1 – 3 – – – Phosphorus (yellow) 7723-14-0 – 0.1 – – – – – Phosphorus oxychloride 10025-87-3 0.1 0.6 – – – – – Phosphorus pentachloride 10026-13-8 – 1 – – – – – Phosphorus pentasulfide 1314-80-3 – 1 – 3 – – – Phosphorus trichloride 7719-12-2 0.2 1.5 0.5 3 – – – Phthalic anhydride 85-44-9 1 6 – – – – – m-Phthalodinitrile 626-17-5 – 5 – – – – – Picloram, Respirable dust Total dust 1918-02-1 – – 5 10 – – – – – – – – – – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Picric acid 88-89-1 – 0.1 – – – – x Piperazine dihydrochloride 142-64-3 – 5 – – – – – Pindone (2-Pivalyl-1,3-indandione) 83-26-1 – 0.1 – – – – – Plaster of Paris (Calcium sulfate), Respirable dust Total dust 26499-65-0 – – 5 15 – – – – – – – – – – Platinum (as Pt) Metal Soluble salts 7440-06-4 – – 1 0.002 – – – – – – – – – – Portland cement, Respirable dust Total dust 65997-15-1 – – 5 10 – – – – – – – – – – Potassium hydroxide 1310-58-3 – – – – – 2 – Propane 74-98-6 1000 1800 – – – – – Propargyl alcohol 107-19-7 1 2 – – – – x beta-Propriolactone; see GI Part 350. CarcinogensF 57-57-8 Propionic acid 79-09-4 10 30 – – – – – Propoxur (Baygon) 114-26-1 – 0.5 – – – – – n-Propyl acetate 109-60-4 200 840 250 1050 – – – n-Propyl alcohol 71-23-8 200 500 250 625 – – – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation n-Propyl nitrate 627-13-4 25 105 40 170 – – – Propylene dichloride 78-87-5 75 350 110 510 – – – Propylene glycol dinitrate 6423-43-4 0.05 0.3 – – – – – Propylene glycol monomethyl ether 107-98-2 100 360 150 540 – – – Propylene imine 75-55-8 2 5 – – – – x Propylene oxide 75-56-9 20 50 – – – – – Propyne; see Methyl acetylene Pyrethrum 8003-34-7 – 5 – – – – – Pyridine 110-86-1 5 15 – – – – – Quinone 106-51-4 0.1 0.4 – – – – – Resorcinol 108-46-3 10 45 20 90 – – – Rhodium, Insoluble compounds (as Rh) Metal fume (as Rh) Soluble compounds (as Rh) 7440-16-6 – – – 0.1 0.1 0.001 – – – – – – – – – – – – – – – Ronnel 299-84-3 – 10 – – – – – Rosin core solder pyrolysis products, as formaldehyde – – 0.1 – – – – – Rotenone 83-79-4 – 5 – – – – – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Rouge, Respirable dust Total dust – – – 5 10 – – – – – – – – – – Selenium compounds (as Se) 7782-49-2 – 0.2 – – – – – Selenium hexafluoride (as Se) 7783-79-1 0.05 0.4 – – – – – Silica, amorphous, precipitated and gel 112926-00-8 – 6 – – – – – Silica, amorphous, diatomaceous earth, containing less than 1% crystalline silica 61790-53-2 – 6 – – – – – Silica, crystalline, respirable dust See GI Part 590. Silica in General Industry Cristobalite 14464-46-1 – 0.05 – – – – – Quartz 14808-60-7 – 0.05 – – – – – Tridymite 15468-32-3 – 0.05 – – – – – Tripoli (as quartz) 1317-95-9 – 0.05 – – – – – Silica, fused, Respirable dust 60676-86-0 – 0.1 – – – – – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Silicates (less than 1% crystalline silica) Mica, respirable dust 12001-26-2 – 3 – – – – – Soapstone, respirable dust – – 3 – – – – – Soapstone, total dust – – 6 – – – – – Talc (containing asbestos); use asbestos limit – OH Part 305 “Asbestos for General Industry,” Talc (containing no asbestos), respirable dust 14807-96-6 – 2 – – – – – Tremolite – OH Part 305 “Asbestos for General Industry,” Silicon, Respirable dust Total dust 7440-21-3 – – 5 10 – – – – – – – – – – Silicon carbide, Respirable dust Total dust 409-21-2 – – 5 10 – – – – – – – – – – Silicon tetrahydride 7803-62-5 5 7 – – – – – Silver, metal and soluble compounds (as Ag) 7440-22-4 – 0.01 – – – – – Soapstone; see Silicates Sodium azide (as HN3) (as NaN3) 26628-22-8 – – – – – – – – 0.1 – – 0.3 x x Sodium bisulfite 7631-90-5 – 5 – – – – – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Sodium fluoroacetate 62-74-8 – 0.05 – 0.15 – – x Sodium hydroxide 1310-73-2 – – – – – 2 – Sodium metabisulfite 7681-57-4 – 5 – – – – – Starch, Respirable dust Total dust 9005-25-8 – – 5 15 – – – – – – – – – – Stibine 7803-52-3 0.1 0.5 – – – – – Stoddard solvent 8052-41-3 100 525 – – – – – Strychnine 57-24-9 – 0.15 – – – – – Styrene 100-42-5 50 215 100 425 – – – Subtilisins (Proteolytic enzymes) 9014-01-1 – – – 0.00006 (60 min.) – – – Sucrose, Respirable dust Total dust 57-50-1 – – 5 15 – – – – – – – – – – Sulfur dioxide 7446-09-5 2 5 5 10 – – – Sulfur hexafluoride 2551-62-4 1000 6000 – – – – – Sulfuric acid 7664-93-9 – 1 – – – – – Sulfur monochloride 10025-67-9 – – – – 1 6 – Sulfur pentafluoride 5714-22-7 – – – – 0.01 0.1 – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Sulfur tetrafluoride 7783-60-0 – – – – 0.1 0.4 – Sulfuryl fluoride 2699-79-8 5 20 10 40 – – – Sulprofos 35400-43-2 – 1 – – – – – SystoxR; see Demeton 2,4,5-T (2,4,5-trichlorophenoxyacetic acid) 93-76-5 – 10 – – – – – Talc; see Silicates Tantalum, metal and oxide dust 7440-25-7 – 5 – – – – – TEDP (Sulfotep) 3689-24-5 – 0.2 – – – – x Tellurium and compounds (as Te) 13494-80-9 – 0.1 – – – – – Tellurium hexafluoride (as Te) 7783-80-4 0.02 0.2 – – – – – Temephos, Respirable dust Total dust 3383-96-8 – – 5 10 – – – – – – – – – – TEPP 107-49-3 – 0.05 – – – – x Terphenyls 26140-60-3 – – – – 0.5 5 – 1,1,1,2-Tetrachloro-2, 2-difluoroethane 76-11-9 500 4170 – – – – – 1,1,2,2-Tetrachloro-1, 2-difluoroethane 76-12-0 500 4170 – – – – – 1,1,2,2-Tetrachloroethane 79-34-5 1 7 – – – – x TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Tetrachloroethylene; see Perchloroethylene Tetrachloromethane; see Carbon tetrachloride Tetrachloronaphthalene 1335-88-2 – 2 – – – – x Tetraethyl lead (as Pb) 78-00-2 – 0.075 – – – – x Tetrahydrofuran 109-99-9 200 590 250 735 – – – Tetramethyl lead (as Pb) 75-74-1 – 0.075 – – – – x Tetramethyl succinonitrile 3333-52-6 0.5 3 – – – – x Tetranitromethane 509-14-8 1 8 – – – – – Tetrasodium pyrophosphate 7722-88-5 – 5 – – – – – Tetryl (2,4,6-Trinitrophenylmethylnitramine) 479-45-8 – 1.5 – – – – x Thallium, soluble compounds (as Tl) 7440-28-0 – 0.1 – – – – x 4,4'-Thiobis(6-tert-butyl-m-cresol) Respirable dust Total dust 96-69-5 – – 5 10 – – – – – – – – – – Thioglycolic acid 68-11-1 1 4 – – – – x Thionyl chloride 7719-09-7 – – – – 1 5 – Thiram 137-26-8 – 5 – – – – – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Tin, Inorganic compounds (except oxides) (as Sn) Organic compounds (as Sn) Oxides (as Sn) 7440-31-5 7440-31-5 21651-19-4 – – – 2 0.1 2 – – – – – – – – – – – – – x – Titanium dioxide Total dust 13463-67-7 – 10 – – – – – Toluene 108-88-3 100 375 150 560 – – – Toluene-2,4-diisocyanate (TDI) 584-84-9 0.005 0.04 0.02 0.15 – – – m-Toluidine 108-44-1 2 9 – – – – x o-Toluidine 95-53-4 5 22 – – – – x p-Toluidine 106-49-0 2 9 – – – – x Toxaphene; see Chlorinated camphene Tremolite; see Silicates Tributyl phosphate 126-73-8 0.2 2.5 – – – – – Trichloroacetic acid 76-03-9 1 7 – – – – – 1,2,4-Trichlorobenzene 120-82-1 – – – – 5 40 – 1,1,1-Trichloroethane; see Methyl chloroform 1,1,2-Trichloroethane 79-00-5 10 45 – – – – x Trichloroethylene 79-01-6 50 270 200 1080 – – – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Trichloromethane; see Chloroform Trichloronaphthalene 1321-65-9 – 5 – – – – x 1,2,3-Trichloropropane 96-18-4 10 60 – – – – – 1,1,2-Trichloro-1,2,2-trifluoroethane 76-13-1 1000 7600 1250 9500 – – – Triethylamine 121-44-8 10 40 15 60 – – – Trifluorobromomethane 75-63-8 1000 6100 – – – – – Trimellitic anhydride 552-30-7 0.005 0.04 – – – – – Trimethylamine 75-50-3 10 24 15 36 – – – Trimethyl benzene 25551-13-7 25 125 – – – – – Trimethyl phosphite 121-45-9 2 10 – – – – – 2,4,6-Trinitrophenol; see Picric acid 2,4,6-Trinitrophenylmethylnitramine; see Tetryl 2,4,6-Trinitrotoluene (TNT) 118-96-7 – 0.5 – – – – x Triorthocresyl phosphate 78-30-8 – 0.1 – – – – x Triphenyl amine 603-34-9 – 5 – – – – – Triphenyl phosphate 115-86-6 – 3 – – – – – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Tungsten Insoluble compounds (as W) Soluble compounds (as W) 7440-33-7 – – 5 1 – – 10 3 – – – – Turpentine 8006-64-2 100 560 – – – – – Uranium (as U) Insoluble compounds Soluble compounds 7440-61-1 – – 0.2 0.05 – – 0.6 - – – – – – – n-Valeraldehyde 110-62-3 50 175 – – – – – Vanadium pentoxide Fume (as V2O5) Respirable dust (as V2O5) 1314-62-1 – – 0.05 0.05 – – – – – – – – – – Vegetable oil mists Respirable mist Total mist – – – 5 15 – – – – – – – – – – Vinyl acetate 108-05-4 10 30 20 60 – – – Vinyl benzene; see Styrene Vinyl bromide 593-60-2 5 20 – – – – – Vinyl chloride; see GI Part 302. Vinyl ChlorideF 75-01-4 1 2.5 5 12.8 Vinyl cyanide; see Acrylonitrile Vinyl cyclohexene dioxide 106-87-6 10 60 – – – – x Vinylidene chloride (1,1-Dichloroethylene) 75-35-4 1 4 – – – – – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Vinyl toluene 25013-15-4 100 480 – – – – – VM & P Naphtha 8032-32-4 300 1350 400 1800 – – – Warfarin 81-81-2 – 0.1 – – – – – Welding fumes (Total particulate)* – – 5 – – – – – Wood dust, all soft and hard woods (except Western red cedar) – – 5 – 10 – – – Wood dust, Western red cedar – – 2.5 – – – – – Xylene (o-,m-,p-isomers) (Dimethyl benzene) 1330-20-7 100 435 150 655 – – – m-Xylene-alpha, alpha’-diamine 1477-55-0 – – – – – 0.1 x Xylidine 1300-73-8 2 10 – – – – x Yttrium 7440-65-5 – 1 – – – – – Zinc chloride fume 7646-85-7 – 1 – 2 – – – Zinc chromates (as Cr+6); see OH Part 315. Chromium (VI) in General IndustryF,G Varies with compound – 0.005 (5 μg/m3) – – – – – Zinc oxide fume 1314-13-2 – 5 – 10 – – – Zinc oxide, Respirable dust Total dust 1314-13-2 – – 5 10 – – – – – – – – – – TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS TWA STELD Ceiling Substance CAS No.A ppmB mg/m3C ppmB mg/m3C ppmB mg/m3C Skin Designation Zinc stearate Respirable dust Total dust 557-05-1 – – 5 10 – – – – – – – – – – Zirconium compounds (as Zr) 7440-67-7 – 5 – 10 – – – All MIOSHA Standards shown in this table are referenced in R 325.51101. * As determined from breathing-zone air samples. ** Parts per billion. A The CAS number is for information only. Enforcement is based on the substance name. For an entry covering more than 1 metal compound measured as the metal, the CAS number for the metal is given - not the CAS number for the individual compounds. B Parts of vapor or gas per million parts of contaminated air by volume at 25 °C and 760 Torr. C Approximate milligrams of substance per cubic meter of air. D Duration is for 15 minutes, unless otherwise noted. E The GI & CS Part 311. “Benzene” standard applies to all occupational exposures to benzene, except some sub-segments of industry where exposures are consistently under the action level. These sub-segments include the distribution and sale of fuels, sealed containers and pipelines, coke production, oil and gas drilling and production, natural gas processing, and the percentage exclusion for liquid mixtures. For the excepted sub-segments, the benzene limits in table G-2 apply. F Caution--this rule contains extensive requirements for exposure to these substances. G If the exposure limit in OH Part 315. “Chromium (VI) in General Industry” is stayed or is otherwise not in effect, the exposure limit is a ceiling of 0.1 mg/m3. TABLE G-2. EXPOSURE LIMITS FOR AIR CONTAMINATES Substance 8-hour, time-weighted average Acceptable ceiling concentration Acceptable maximum peak above the acceptable ceiling concentration for an 8-hour workshift. Concentration Maximum duration S BenzeneE,F 10 ppm 25 ppm 50 ppm 10 minutes S Ethylene dibromide 20 ppm 30 ppm 50 ppm 5 minutes Note: S above signifies that skin contact shall not be allowed. E The GI & CS Part 311. “Benzene” standard applies to all occupational exposures to benzene, except some sub-segments of industry where exposures are consistently under the action level. These sub-segments include the distribution and sale of fuels, sealed containers and pipelines, coke production, oil and gas drilling and production, natural gas processing, and the percentage exclusion for liquid mixtures. For the excepted sub-segments, the benzene limits in this table apply. F Caution--this rule contains extensive requirements for exposure to these substances.