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Code of Federal Regulations (Last Updated: November 8, 2024) |
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Title 29 - Labor |
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Subtitle B - Regulations Relating to Labor |
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Chapter XVII - Occupational Safety and Health Administration, Department of Labor |
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Part 1915 - Occupational Safety and Health Standards for Shipyard Employment |
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Subpart Z - Toxic and Hazardous Substances |
§ 1915.1000 - Air contaminants.
Latest version.
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§ 1915.1000 Air contaminants.
Wherever this section applies, an employee's exposure to any substance listed in Table Z - Shipyards of this section shall be limited in accordance with the requirements of the following paragraphs of this section.
(a)
(1) Substances with limits preceded by “C” - Ceiling values. An employee's exposure to any substance in Table Z - Shipyards, the exposure limit of which is preceded by a “C,” shall at no time exceed the exposure limit given for that substance. If instantaneous monitoring is not feasible, then the ceiling shall be assessed as a 15-minute time weighted average exposure which shall not be exceeded at any time over a working day.
(2) Other Substances - 8-hour Time Weighted Averages. An employee's exposure to any substance in Table Z - Shipyards, the exposure limit of which is not preceded by a “C,” shall not exceed the 8-hour Time Weighted Average given for that substance in any 8-hour work shift of a 40-hour work week.
(b)-(c) [Reserved]
(d) Computation formula. The computation formula which shall apply to employee exposure to more than one substance for which 8-hour time weighted averages are listed in subpart Z of 29 CFR part 1915 in order to determine whether an employee is exposed over the regulatory limit is as follows:
(1)
(i) The cumulative exposure for an 8-hour work shift shall be computed as follows:
E = (Ca Ta + Cb Tb + ...Cn Tn) ÷ 8
Where:
E is the equivalent exposure for the working shift.
C is the concentration during any period of time T where the concentration remains constant.
T is the duration in hours of the exposure at the concentration C.
The value of E shall not exceed the 8-hour time weighted average specified in subpart Z of 29 CFR part 1915 for the material involved.
(ii) To illustrate the formula prescribed in paragraph (d)(1)(i) of this section, assume that Substance A has an 8-hour time weighted average limit of 100 ppm noted in Table Z - Shipyards. Assume that an employee is subject to the following exposure:
Two hours exposure at 150 ppm
Two hours exposure at 75 ppm
Four hours exposure at 50 ppm
Substituting this information in the formula, we have
(2 × 150 + 2 × 75 + 4 × 50) ÷ 8 = 81.25 ppm
Since 81.25 ppm is less than 100 ppm, the 8-hour time weighted average limit, the exposure is acceptable.
(2)
(i) in case of a mixture of air contaminants an employer shall compute the equivalent exposure as follows:
Em = (C1 ÷ L1 + C2 ÷ L2) + ...(Cn ÷ Ln)
Where:
Em is the equivalent exposure for the mixture.
C is the concentration of a particular contaminant.
L is the exposure limit for that substance specified in subpart Z of 29 CFR part 1915.
The value of Em shall not exceed unity (1).
(ii) To illustrate the formula prescribed in paragraph (d)(2)(i) of this section, consider the following exposures:
Substance Actual concentration of 8 hour exposure (ppm) 8 hr. TWA PEL (ppm) B 500 1000 C 45 200 D 40 200 Since Em is less than unity (1), the exposure combination is within acceptable limits.
Table Z - Shipyards
Substance CAS No.d ppma * mg/m3 b * Skin Designation Abate; see Temephos Acetaldehyde 75-07-0 200 360 - Acetic acid 64-19-7 10 25 - Acetic anhydride 108-24-7 5 20 - Acetone 67-64-1 1000 2400 - Acetonitrile 75-05-8 40 70 - 2-Acetylaminofluorine; see § 1915.1014 53-96-3 Acetylene 74-86-2 E Acetylene dichloride; see 1,2-Dichloroethylene Acetylene tetrabromide 79-27-6 1 14 - Acrolein 107-02-8 0.1 0.25 - Acrylamide 79-06-1 - 0.3 X Acrylonitrile; see § 1915.1045 107-13-1 Aldrin 309-00-2 - 0.25 X Allyl alcohol 107-18-6 2 5 X Allyl chloride 107-05-1 1 3 - Allyl glycidyl ether (AGE) 106-92-3 (C)10 (C)45 - Allyl propyl disulfide 2179-59-1 2 12 - alpha-Alumina 1344-28-1 Total dust - 15 - Respirable fraction - 5 - Aluminum, (as Al) Metal 7429-90-5 Total dust - 15 - Respirable fraction - 5 - Alundum; see alpha-Alumina 4-Aminodiphenyl; see § 1915.1011 92-67-1 2-Aminoethanol; see Ethanolamine 2-Aminopyridine 504-29-0 0.5 2 - Ammonia 7664-41-7 50 35 - Ammonium sulfamate 7773-06-0 Total dust - 15 - Respirable fraction - 5 - n-Amyl acetate 628-63-7 100 525 - sec-Amyl acetate 626-38-0 125 650 - Aniline and homologs 62-53-3 5 19 X Anisidine (o-, 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 - Argon 7440-37-1 E Arsenic, inorganic compounds (as As); see § 1915.1018 7440-38-2 - - - Arsenic, organic compounds (as As) 7440-38-2 - 0.5 - Arsine 7784-42-1 0.05 0.2 - Asbestos; see 1915.1001 Azinphos-methyl 86-50-0 - 0.2 X Barium, soluble compounds (as Ba) 7440-39-3 - 0.5 - Barium sulfate 7727-43-7 Total dust - 15 - Respirable fraction - 5 - Benomyl 17804-35-2 Total dust - 15 - Respirable fraction - 5 - Benzeneg; see § 1915.1028 71-43-2 Benzidine; see § 1915.1010 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 1915.1024(q) 7440-41-7 0.002 Biphenyl; see Diphenyl Bismuth telluride, Undoped 1304-82-1 Total dust - 15 - Respirable fraction - 5 - Bisphenol A; see Diglycidyl ether Boron oxide 1303-86-2 Total dust - 15 - Boron tribromide 10294-33-4 1 10 - Boron trifluoride 7637-07-2 (C)1 (C)3 - Bromine 7726-95-6 0.1 0.7 - Bromine pentafluoride 7789-30-2 0.1 0.7 - Bromoform 75-25-2 0.5 5 X Butadiene (1,3-Butadiene); see 29 CFR 1910.1051; 29 CFR 1910.19(l) 106-99-0 1
ppm/5
ppm
STEL- - Butanethiol; see Butyl mercaptan 2-Butanone (Methyl ethyl ketone) 78-93-3 200 590 - 2-Butoxyethanol 111-76-2 50 240 X n-Butyl-acetate 123-86-4 150 710 - sec-Butyl acetate 105-46-4 200 950 - tert-Butyl acetate 540-88-5 200 950 - n-Butyl alcohol 71-36-3 100 300 - sec-Butyl alcohol 78-92-2 150 450 - tert-Butyl alcohol 75-65-0 100 300 - Butylamine 109-73-9 (C)5 (C)15 X tert-Butyl chromate (as CrO3); see 1915.1026n 1189-85-1 n-Butyl glycidyl ether (BGE) 2426-08-6 50 270 - Butyl mercaptan 109-79-5 0.5 1.5 - p-tert-Butyltoluene 98-51-1 10 60 - Cadmium dust fume (as Cd); see 1915.1027 7440-43-9 - - - Calcium carbonate 1317-65-3 Total dust - 15 - Respirable fraction - 5 - Calcium hydroxide 1305-62-0 - - - Calcium hydroxide Total dust - 15 - Respirable fraction - 5 - Calcium oxide 1305-78-8 - 5 - Calcium silicate 1344-95-2 Total dust - 15 - Respirable fraction - 5 - Calcium sulfate 7778-18-9 Total dust - 15 - Respirable fraction - 5 - Camphor, synthetic 76-22-2 - 2 - Carbaryl (Sevin) 63-25-2 - 5 - Carbon black 1333-86-4 - 3.5 - Carbon dioxide 124-38-9 5000 9000 - Carbon disulfide 75-15-0 20 60 X Carbon monoxide 630-08-0 50 55 - Carbon tetrachloride 56-23-5 10 65 X Cellulose 9004-34-6 Total dust - 15 - Respirable fraction - 5 - Chlordane 57-74-9 - 0.5 X Chlorinated camphene 8001-35-2 - 0.5 X Chlorinated diphenyl oxide 55720-99-5 - 0.5 - Chlorine 7782-50-5 1 3 - Chlorine trifluoride 7790-91-2 (C)0.1 (C)0.4 - Chloroacetaldehyde 107-20-0 (C)1 (C)3 - a-Chloroacetophenone (Phenacyl chloride) 532-27-4 0.05 0.3 - Chlorobenzene 108-90-7 75 350 - o-Chlorobenzylidene malononitrile 2698-41-1 0.05 0.4 - Chlorobromomethane 74-97-5 200 1050 - 2-Chloro-1,3-butadiene; see beta-Chloroprene Chlorodiphenyl (42% Chlorine) (PCB) 53469-21-9 - 1 X Chlorodiphenyl (54% Chlorine) (PCB) 11097-69-1 - 0.5 X 1-Chloro,2,3-epoxypropane; see Epichlorohydrin 2-Chloroethanol; see Ethylene chlorohydrin Chloroethylene; see Vinyl chloride Chloroform (Trichloromethane) 67-66-3 50 240 - bis(Chloromethyl) ether; see § 1915.1008 542-88-1 Chloromethyl methyl ether; see § 1915.1006 107-30-2 1-Chloro-1-nitropropane 600-25-9 20 100 - Chloropicrin 76-06-2 0.1 0.7 beta-Chloroprene 126-99-8 25 90 X 2-Chloro-6-(trichloromethyl) pyridine 1929-82-4 Total dust - 15 - Respirable fraction - 5 - Chromium (II) compounds (as Cr) 7440-47-3 - 0.5 - Chromium (III) compounds (as Cr) 7440-47-3 - 0.5 - Chromium (VI) compounds; see 1915.1026o Chromium metal and insol. salts (as Cr) 7440-47-3 - 1 - Chrysene; see Coal tar pitch volatiles Clopidol 2971-90-6 Total dust - 15 - Respirable fraction - 5 - Coal tar pitch volatiles (benzene soluble fraction), anthracene, BaP, phenanthrene, acridine, chrysene, pyrene 65966-93-2 - 0.2 - Cobalt metal, dust, and fume (as Co) 7440-48-4 - 0.1 - Copper 7440-50-8 Fume (as Cu) - 0.1 - Dusts and mists (as Cu) - 1 - Corundum; see Emery Cotton dust (raw) - 1 Crag herbicide (Sesone) 136-78-7 Total dust - 15 - Respirable fraction - 5 - Cresol, all isomers 1319-77-3 5 22 X Crotonaldehyde 123-73-9; 2 6 4170-30-3 Cumene 98-82-8 50 245 X Cyanides (as CN) Varies with Compound - 5 - Cyanogen 460-19-5 10 - - Cyclohexane 110-82-7 300 1050 - Cyclohexanol 108-93-0 50 200 - Cyclohexanone 108-94-1 50 200 - Cyclohexene 110-83-8 300 1015 - Cyclonite 121-82-4 - 1.5 X Cyclopentadiene 542-92-7 75 200 - 2,4-D (Dichlorophenoxyacetic acid) 94-75-7 - 10 - Decaborane 17702-41-9 0.05 0.3 X Demeton (Systox) 8065-48-3 - 0.1 X Diacetone alcohol (4-Hydroxy-4-methyl-2-pentanone) 123-42-2 50 240 - 1,2-Diaminoethane; see Ethylenediamine Diazomethane 334-88-3 0.2 0.4 - Diborane 19287-45-7 0.1 0.1 - 1,2-Dibromo-3-chloropropane (CBCP); see § 1915.1044 96-12-8 - 1,2-Dibromoethane; see Ethylene dibromide Dibutyl phosphate 107-66-4 1 5 - Dibutyl phthalate 84-74-2 - 5 - Dichloroacetylene 7572-29-4 (C)0.1 (C)0.4 - o-Dichlorobenzene 95-50-1 (C)50 (C)300 - p-Dichlorobenzene 106-46-7 75 450 - 3,3′-Dichlorobenzidine; see § 1915.1007 91-94-1 Dichlorodifluoromethane 75-71-8 1000 4950 - 1,3-Dichloro-5,5-dimethyl hydantoin 118-52-5 - 0.2 - Dichlorodiphenyltrichloroethane (DDT) 50-29-3 - 1 X 1,1-Dichloroethane 75-34-3 100 400 - 1,2-Dichloroethane; see Ethylene dichloride 1,2-Dichloroethylene 540-59-0 200 790 - Dichloroethyl ether 111-44-4 (C)15 (C)90 X Dichloromethane; see Methylene chloride Dichloromonofluoromethane 75-43-4 1000 4200 - 1,1-Dichloro-1-nitroethane 594-72-9 (C)10 (C)60 - 1,2-Dichloropropane; see Propylene dichloride Dichlorotetrafluoroethane 76-14-2 1000 7000 - Dichlorvos (DDVP) 62-73-7 - 1 X Dicyclopentadienyl iron 102-54-5 Total dust - 15 - Respirable fraction - 5 - Dieldrin 60-57-1 - 0.25 X Diethylamine 109-89-7 25 75 - 2-Diethylaminoethanol 100-37-8 10 50 - Diethylene triamine 111-40-0 (C)10 (C)42 X Diethyl ether; see Ethyl ether Difluorodibromomethane 75-61-6 100 860 - Diglycidyl ether (DGE) 2238-07-5 (C)0.5 (C)2.8 - Dihydroxybenzene; see Hydroquinone Diisobutyl ketone 108-83-8 50 290 - Diisopropylamine 108-18-9 5 20 X 4-Dimethylaminoazobenzene; see § 1915.1015 60-11-7 Dimethoxymethane; see Methylal 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 X Dimethylbenzene; see Xylene Dimethyl-1,2-dibromo- 2,2-dichloroethyl phosphate 300-76-5 - 3 - 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 77-78-3 1 5 X Dinitrobenzene (all isomers) 1 X (ortho) 528-29-0 (meta) 99-65-0 (para) 100-25-4 Dinitro-o-cresol 534-52-1 - 0.2 X Dinitrotoluene 25321-14-6 - 1.5 X Dioxane (Diethylene dioxide) 123-91-1 100 360 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 X Di-sec octyl phthalate (Di-(2-ethylhexyl) phthalate) 117-81-7 - 5 - Emery 12415-34-8 Total dust - 15 - Respirable fraction - 5 - Endosulfan 115-29-7 - 0.1 X Endrin 72-20-8 - 0.1 X Epichlorohydrin 106-89-8 5 19 X EPN 2104-64-5 - 0.5 X 1,2-Epoxypropane; see Propylene oxide 2,3-Epoxy-1-propanol; see Glycidol Ethane 74-84-0 E Ethanethiol; see Ethyl mercaptan Ethanolamine 141-43-5 3 6 - 2-Ethoxyethanol (Cellosolve) 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 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 - Ethyl bromide 74-96-4 200 890 - Ethyl butyl ketone (3-Heptanone) 106-35-4 50 230 - Ethyl chloride 75-00-3 1000 2600 - Ethyl ether 60-29-7 400 1200 - Ethyl formate 109-94-4 100 300 - Ethyl mercaptan 75-08-1 0.5 1 - Ethyl silicate 78-10-4 100 850 - Ethylene 74-85-1 E Ethylene chlorohydrin 107-07-3 5 16 X Ethylenediamine 107-15-3 10 25 - Ethylene dibromide 106-93-4 (C)25 (C)190 X Ethylene dichloride (1,2-Dichloroethane) 107-06-2 50 200 - Ethylene glycol dinitrate 628-96-6 (C)0.2 (C)1 X Ethylene glycol methyl acetate; see Methyl cellosolve acetate Ethyleneimine; see § 1915.1012 151-56-4 Ethylene oxide; see § 1915.1047 75-21-8 Ethylidene chloride; see 1,1-Dichloroethane N-Ethylmorpholine 100-74-3 20 94 X Ferbam 14484-64-1 Total dust - 15 - Ferrovanadium dust 12604-58-9 - 1 - Fibrous Glass Total dust 15 - Respirable fraction - 5 - Fluorides (as F) Varies with compound - 2.5 - Fluorine 7782-41-4 0.1 0.2 - Fluorotrichloromethane (Trichlorofluoromethane) 75-69-4 1000 5600 - Formaldehyde; see § 1915.1048 50-00-0 Formic acid 64-18-6 5 9 - Furfural 98-01-1 5 20 X Furfuryl alcohol 98-00-0 50 200 - Gasoline 8006-61-9 A3 - Glycerin (mist) 56-81-5 Total dust - 15 - Respirable fraction - 5 - Glycidol 556-52-5 50 150 - Glycol monoethyl ether; see 2-Ethoxyethanol Graphite, natural, respirable dust 7782-42-5 (2) (2) (2) Graphite, synthetic Total dust - 15 - Respirable fraction - 5 - Guthion; see Azinphos methyl Gypsum 13397-24-5 Total dust - 15 - Respirable fraction - 5 - Hafnium 7440-58-6 - 0.5 - Helium 7440-59-7 E Heptachlor 76-44-8 - 0.5 X Heptane (n-Heptane) 142-82-5 500 2000 - Hexachloroethane 67-72-1 1 10 X Hexachloronaphthalene 1335-87-1 - 0.2 X n-Hexane 110-54-3 500 1800 - 2-Hexanone (Methyl n-butyl ketone) 591-78-6 100 410 - Hexone (Methyl isobutyl ketone) 108-10-1 100 410 - sec-Hexyl acetate 108-84-9 50 300 - Hydrazine 302-01-2 1 1.3 X Hydrogen 1333-74-0 E Hydrogen bromide 10035-10-6 3 10 - Hydrogen chloride 7647-01-0 (C)5 (C)7 - Hydrogen cyanide 74-90-8 10 11 X Hydrogen fluoride (as F) 7664-39-3 3 2 - Hydrogen peroxide 7722-84-1 1 1.4 - Hydrogen selenide (as Se) 7783-07-5 0.05 Hydrogen sulfide 7783-06-4 10 15 - Hydroquinone 123-31-9 - 2 - Indene 95-13-6 10 45 - Indium and compounds (as In) 7440-74-6 - 0.1 - Iodine 7553-56-2 (C)0.1 (C)1 - Iron oxide fume 1309-37-1 - 10 - 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 - Isobutyl acetate 110-19-0 150 700 - Isobutyl alcohol 78-83-1 100 300 - Isophorone 78-59-1 25 140 - Isopropyl acetate 108-21-4 250 950 - Isopropyl alcohol 67-63-0 400 980 - Isopropylamine 75-31-0 5 12 - Isopropyl ether 108-20-3 500 2100 - Isopropyl glycidyl ether (IGE) 4016-14-2 50 240 - Kaolin 1332-58-7 Total dust - 15 - Respirable fraction - 5 - Ketene 463-51-4 0.5 0.9 - Lead, inorganic (as Pb); see § 1915.1025 7439-92-1 - - - Limestone 1317-65-3 Total dust - 15 - Respirable fraction - 5 - Lindane 58-89-9 - 0.5 X Lithium hydride 7580-67-8 - 0.025 - L.P.G. (Liquefied petroleum gas) 68476-85-7 1000 1800 Magnesite 546-93-0 Total dust - 15 - Respirable fraction - 5 - Magnesium oxide fume 1309-48-4 Total particulate 15 - - Malathion 121-75-5 Total dust - 15 X Maleic anhydride 108-31-6 0.25 Manganese compounds (as Mn) 7439-96-5 - (C)5 - Manganese fume (as Mn) 7439-96-5 - (C)5 - Marble 1317-65-3 Total dust - 15 - Respirable fraction - 5 - Mercury (aryl and inorganic)(as Hg) 7439-97-6 0.1 X Mercury (organo) alkyl compounds (as Hg) 7439-97-6 - 0.01 X Mercury (vapor) (as Hg) 7439-97-6 - 0.1 X Mesityl oxide 141-79-7 25 100 - Methane 74-82-8 E Methanethiol; see Methyl mercaptan Methoxychlor 72-43-5 Total dust - 15 - 2-Methoxyethanol (Methyl cellosolve) 109-86-4 25 80 X 2-Methoxyethyl acetate (Methyl cellosolve acetate) 110-49-6 25 120 X Methyl acetate 79-20-9 200 610 - Methyl acetylene (Propyne) 74-99-7 1000 1650 - Methyl acetylene-propadiene mixture (MAPP) 1000 1800 - Methyl acrylate 96-33-3 10 35 X Methylal (Dimethoxy-methane) 109-87-5 1000 3100 - Methyl alcohol 67-56-1 200 260 - 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 (C)20 (C)80 X Methyl butyl ketone; see 2-Hexanone Methyl cellosolve; see 2-Methoxyethanol Methyl cellosolve acetate; see 2-Methoxyethyl acetate Methyl chloride 74-87-3 100 210 - Methyl chloroform (1,1,1-Trichloroethane) 71-55-6 350 1900 - Methylcyclohexane 108-87-2 500 2000 - Methylcyclohexanol 25639-42-3 100 470 - o-Methylcyclohexanone 583-60-8 100 460 X Methylene chloride; see § 1910.1052 Methyl ethyl ketone (MEK); see 2-Butanone Methyl formate 107-31-3 100 250 - Methyl hydrazine (Monomethyl hydrazine) 60-34-4 (C)0.2 (C)0.35 X Methyl iodide 74-88-4 5 28 X Methyl isoamyl ketone 110-12-3 100 475 - Methyl isobutyl carbinol 108-11-2 25 100 X Methyl isobutyl ketone; see Hexone Methyl isocyanate 624-83-9 0.02 0.05 X Methyl mercaptan 74-93-1 0.5 1 - Methyl methacrylate 80-62-6 100 410 100 Methyl propyl ketone; see 2-Pentanone Methyl silicate 681-84-5 5 30 - alpha-Methyl styrene 98-83-9 (C)100 (C)480 - Methylene bisphenyl isocyanate (MDI) 101-68-8 (C)0.02 (C)0.2 - Mica; see Silicates Mineral wool Total dust - 15 - Respirable dust - 5 - Molybdenum (as Mo) 7439-98-7 Soluble compounds - 5 - Insoluble compounds Total dust - 15 - Monomethyl aniline 100-61-8 2 9 X Monomethyl hydrazine; see Methyl hydrazine Morpholine 110-91-8 20 70 X Naphtha (Coal tar) 8030-30-6 100 400 - Naphthalene 91-20-3 10 50 - alpha-Naphthylamine; see § 1915.1004 134-32-7 beta-Naphthylamine; see § 1915.1009 91-59-8 - Neon 7440-01-9 Nickel carbonyl (as Ni) 13463-39-3 0.001 0.007 - Nickel, metal and insoluble compounds (as Ni) 7440-02-0 - 1 - Nickel, soluble compounds (as Ni) 7440-02-0 - 1 - Nicotine 54-11-5 - 0.5 X Nitric acid 7697-37-2 2 5 - Nitric oxide 10102-43-9 25 30 - p-Nitroaniline 100-01-6 1 6 X Nitrobenzene 98-95-3 1 5 X p-Nitrochlorobenzene 100-00-5 - 1 X 4-Nitrodiphenyl; see § 1915.1003 92-93-3 Nitroethane 79-24-3 100 310 - Nitrogen 7727-37-9 E Nitrogen dioxide 10102-44-0 (C)5 (C)9 - Nitrogen trifluoride 7783-54-2 10 29 - Nitroglycerin 55-63-0 (C)0.2 (C)2 X Nitromethane 75-52-5 100 250 - 1-Nitropropane 108-03-2 25 90 - 2-Nitropropane 79-46-9 25 90 - N-Nitrosodimethylamine; see § 1915.1016 62-79-9 - Nitrotoluene (all isomers) 5 30 X o-isomer 88-72-2; m-isomer 99-08-1; p-isomer 99-99-0 Nitrotrichloromethane; see Chloropicrin Nitrous oxide 10024-97-2 E Octachloronaphthalene 2234-13-1 - 0.1 X Octane 111-65-9 400 1900 - Oil mist, mineral 8012-95-1 - 5 - Osmium tetroxide (as Os) 20816-12-0 - 0.002 - Oxalic acid 144-62-7 - 1 - Oxygen difluoride 7783-41-7 0.05 0.1 - Ozone 10028-15-6 0.1 0.2 - Paraquat, respirable dust 4685-14-7; - 0.5 X 1910-42-5; 2074-50-2 Parathion 56-38-2 - 0.1 - Particulates not otherwise regulated Total dust organic and inorganic - 15 - PCB; see Chlorodiphenyl (42% and 54% chlorine) Pentaborane 19624-22-7 0.005 0.01 - Pentachloronaphthalene 1321-64-8 - 0.5 X Pentachlorophenol 87-86-5 - 0.5 X Pentaerythritol 115-77-5 Total dust - 15 - Respirable fraction - 5 - Pentane 109-66-0 500 1500 - 2-Pentanone (Methyl propyl ketone) 107-87-9 200 700 - Perchloroethylene (Tetrachloroethylene) 127-18-4 100 670 - Perchloromethyl mercaptan 594-42-3 0.1 0.8 - Perchloryl fluoride 7616-94-6 3 13.5 - Perlite 93763-70-3 Total dust - 15 - Respirable fraction - 5 - Petroleum distillates (Naphtha)(Rubber Solvent) A3 - Phenol 108-95-2 5 19 X p-Phenylene diamine 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 10 60 - Phenylhydrazine 100-63-0 5 22 X Phosdrin (Mevinphos) 7786-34-7 - 0.1 X Phosgene (Carbonyl chloride) 75-44-5 0.1 0.4 - Phosphine 7803-51-2 0.3 0.4 - Phosphoric acid 7664-38-2 - 1 - Phosphorus (yellow) 7723-14-0 - 0.1 - Phosphorus pentachloride 10026-13-8 - 1 - Phosphorus pentasulfide 1314-80-3 - 1 - Phosphorus trichloride 7719-12-2 0.5 3 - Phthalic anhydride 85-44-9 2 12 - Picloram 1918-02-1 Total dust - 15 - Respirable fraction - 5 - Picric acid 88-89-1 - 0.1 - Piperazine dihydrochloride 142-64-3 - - X Pindone (2-Pivalyl-1,3-indandione) 83-26-1 - 0.1 - Plaster of Paris 26499-65-0 Total dust - 15 - Respirable fraction - 5 - Platinum (as Pt) 7440-06-4 Metal - - - Soluble salts - 0.002 - Polytetrafluoroethylene decomposition products A2 Portland cement 65997-15-1 Total dust 15 - 10 Respirable fraction 5 - - Propargyl alcohol 107-19-7 1 - X beta-Propriolactone; see § 1915.1013 57-57-8 Propionic acid 79-09-4 - - - n-Propyl acetate 109-60-4 200 840 - n-Propyl alcohol 71-23-8 200 500 - n-Propyl nitrate 627-13-4 25 110 - Propylene dichloride 78-87-5 75 350 - Propylene imine 75-55-8 2 5 X Propylene oxide 75-56-9 100 240 - Propyne; see Methyl acetylene Pyrethrum 8003-34-7 - 5 - Pyridine 110-86-1 5 15 - Quinone 106-51-4 0.1 0.4 - RDX; see Cyclonite Rhodium (as Rh), metal fume and insoluble compounds 7440-16-6 - 0.1 - Rhodium (as Rh), soluble compounds 7440-16-6 - 0.001 - Ronnel 299-84-3 - 10 - Rotenone 83-79-4 - 5 - Rouge - Total dust - 15 - Respirable fraction - 5 - 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 (2) (2) (2) Silica, amorphous, diatomaceous earth, containing less than 1% crystalline silica 61790-53-2 (2) (2) (2) Silica, crystalline, respirable dust Cristobalite; see 1915.1053 14464-46-1 Quartz; see 1915.10535 14808-60-7 Tripoli (as quartz); see 1915.10535 1317-95-9 Tridymite; see 1915.1053 15468-32-3 Silica, fused, respirable dust 60676-86-0 (2) (2) (2) Silicates (less than 1% crystalline silica) Mica (respirable dust) 12001-26-2 (2) (2) (2) Soapstone, total dust - (2) (2) (2) Soapstone, respirable dust - (2) (2) (2) Talc (containing asbestos) - (3) (3) (3) Talc (containing no asbestos), respirable dust 14807-96-6 (2) (2) (2) Tremolite, asbestiform (3) (3) (3) Silicon 7440-21-3 Total dust - 15 - Respirable fraction - 5 - Silicon carbide 409-21-2 Total dust - 15 - Respirable fraction - 5 - Silver, metal and soluble compounds (as Ag) 7440-22-4 - 0.01 - Soapstone; see Silicates Sodium fluoroacetate 62-74-8 - 0.05 X Sodium hydroxide 1310-73-2 - 2 - Starch 9005-25-8 Total dust - 15 - Respirable fraction - 5 - Stibine 7803-52-3 0.1 0.5 - Stoddard solvent 8052-41-3 200 1150 - Strychnine 57-24-9 - 0.15 - Styrene 100-42-5 100 420 50 Sucrose 57-50-1 Total dust - 15 - Respirable fraction - 5 - Sulfur dioxide 7446-09-5 5 13 - 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 0.025 0.25 - Sulfuryl fluoride 2699-79-8 5 20 - Systox, 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 Teflon decomposition products A2 Tellurium and compounds (as Te) 13494-80-9 - 0.1 - Tellurium hexafluoride (as Te) 7783-80-4 0.02 0.2 - Temephos 3383-96-8 Total dust - 15 - Respirable fraction - 5 - TEPP (Tetraethyl pyrophosphate) 107-49-3 - 0.05 X Terphenyls 26140-60-3 (C)1 (C)9 - 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 5 35 X Tetrachloroethylene; see Perchloroethylene Tetrachloromethane; see Carbon tetrachloride Tetrachloronaphthalene 1335-88-2 - 2 X Tetraethyl lead (as Pb) 78-00-2 - 0.1 X Tetrahydrofuran 109-99-9 200 590 - Tetramethyl lead, (as Pb) 75-74-1 - 0.15 X Tetramethyl succinonitrile 3333-52-6 0.5 3 X Tetranitromethane 509-14-8 1 8 - 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) 96-69-5 Total dust - 15 - Respirable fraction - 5 - Thiram 137-26-8 - 5 - Tin, inorganic compounds (except oxides) (as Sn) 7440-31-5 - 2 - Tin, organic compounds (as Sn) 7440-31-5 - 0.1 - Tin oxide (as Sn) 21651-19-4 - - - Total dust - 15 - Respirable fraction - 5 - Titanium dioxide 13463-67-7 Total dust - 15 - Toluene 108-88-3 200 750 100 Toluene-2,4-diisocyanate (TDI) 584-84-9 (C)0.02 (C)0.14 - o-Toluidine 95-53-4 5 22 X Toxaphene; see Chlorinated camphene Tremolite; see Silicates Tributyl phosphate 126-73-8 - 5 - 1,1,1-Trichloroethane; see Methyl chloroform 1,1,2-Trichloroethane 79-00-5 10 45 X Trichloroethylene 79-01-6 100 535 - Trichloromethane; see Chloroform Trichloronaphthalene 1321-65-9 - 5 X 1,2,3-Trichloropropane 96-18-4 50 300 - 1,1,2-Trichloro-1,2,2-trifluoroethane 76-13-1 1000 7600 - Triethylamine 121-44-8 25 100 - Trifluorobromomethane 75-63-8 1000 6100 - Trimethyl benzene 25551-13-7 25 120 - 2,4,6-Trinitrophenyl; see Picric acid 2,4,6-Trinitrophenylmethylnitramine; see Tetryl 2,4,6-Trinitrotoluene (TNT) 118-96-7 - 1.5 X Triorthocresyl phosphate 78-30-8 - 0.1 - Triphenyl phosphate 115-86-6 - 3 - Tungsten (as W) 7440-33-7 Insoluble compounds - 5 - Soluble compounds - 1 - Turpentine 8006-64-2 100 560 - Uranium (as U) 7440-61-1 Soluble compounds - 0.2 - Insoluble compounds - 0.2 - Vanadium 1314-62-1 Respirable dust (as V2 O5) - (C)0.5 - Fume (as V2 O5) - (C)0.1 - Vegetable oil mist Total dust - 15 - Respirable fraction - 5 - Vinyl benzene; see Styrene Vinyl chloride; see § 1915.1017 75-01-4 Vinyl cyanide; see Acrylonitrile Vinyl toluene 25013-15-4 100 480 - Warfarin 81-81-2 - 0.1 - Xylenes (o-, m-, p-isomers) 1330-20-7 100 435 - Xylidine 1300-73-8 5 25 X Yttrium 7440-65-5 - 1 - Zinc chloride fume 7646-85-7 - 1 - Zinc oxide fume 1314-13-2 - 5 - Zinc oxide 1314-13-2 Total dust - 15 - Respirable fraction - 5 - Zinc stearate 557-05-1 Total dust - 15 - Respirable fraction - 5 - Zirconium compounds (as Zr) 7440-67-7 - 5 Mineral Dusts
Substance mppcf(j) SILICA: Crystalline 250(k) Quartz. Threshold Limit calculated from the formula(p) % SiO2 + 5 Cristobalite Amorphous, including natural diatomaceous earth 20 SILICATES (less than 1% crystalline silica) Mica 20 Portland cement 50 Soapstone 20 Talc (non-asbestiform) 20 Talc (fibrous), use asbestos limit - - Graphite (natural) 15 Inert or Nuisance Particulates:(m) 50 (or 15 mg/m3 whichever is the smaller) of total dust <1% SiO2 Conversion factors mppcf × 35.3 = million particles per cubic meter = particles per c.c. [58 FR 35514, July 1, 1993, as amended at 61 FR 56856, Nov. 4, 1996; 62 FR 1619, Jan. 10, 1997; 67 FR 44545, July 3, 2002; 71 FR 10377, Feb. 28, 2006; 71 FR 36009, June 23, 2006; 76 FR 80740, Dec. 27, 2011; 81 FR 16874, Mar. 2 2016; 81 FR 31167, May 19, 2016; 81 FR 60273, Sept. 2, 2016; 82 FR 2744, Jan. 9, 2017]