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Title 29Subtitle BChapter XVIIPart 1915Subpart Z → §1915.1000


Title 29: Labor
PART 1915—OCCUPATIONAL SAFETY AND HEALTH STANDARDS FOR SHIPYARD EMPLOYMENT
Subpart Z—Toxic and Hazardous Substances


§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:

SubstanceActual concentration of 8 hour exposure (ppm)8 hr. TWA PEL (ppm)
B5001000
C45200
D40200

Substituting in the formula, we have:

Em = 500 ÷ 1,000 + 45 ÷ 200 + 40 ÷ 200

Em = 0.500 + 0.225 + 0.200

Em = 0.925

Since Em is less than unity (1), the exposure combination is within acceptable limits.

Table Z—Shipyards

SubstanceCAS No.dppma *mg/m3 b *Skin Designation
Abate; see Temephos
Acetaldehyde75-07-0200360
Acetic acid64-19-71025
Acetic anhydride108-24-7520
Acetone67-64-110002400
Acetonitrile75-05-84070
2-Acetylaminofluorine; see §1915.101453-96-3
Acetylene74-86-2E
Acetylene dichloride; see 1,2-Dichloroethylene
Acetylene tetrabromide79-27-6114
Acrolein107-02-80.10.25
Acrylamide79-06-10.3X
Acrylonitrile; see §1915.1045107-13-1
Aldrin309-00-20.25X
Allyl alcohol107-18-625X
Allyl chloride107-05-113
Allyl glycidyl ether (AGE)106-92-3(C)10(C)45
Allyl propyl disulfide2179-59-1212
alpha-Alumina1344-28-1
Total dust   15
Respirable fraction   5
Aluminum, (as Al) Metal7429-90-5
Total dust   15
Respirable fraction   5
Alundum; see alpha-Alumina
4-Aminodiphenyl; see §1915.101192-67-1
2-Aminoethanol; see Ethanolamine
2-Aminopyridine504-29-00.52
Ammonia7664-41-75035
Ammonium sulfamate7773-06-0
Total dust   15
Respirable fraction   5
n-Amyl acetate628-63-7100525
sec-Amyl acetate626-38-0125650
Aniline and homologs62-53-3519X
Anisidine (o-, p-isomers)29191-52-40.5X
Antimony and compounds (as Sb)7440-36-00.5
ANTU (alpha Naphthylthiourea)86-88-40.3
Argon7440-37-1E
Arsenic, inorganic compounds (as As); see §1915.10187440-38-2
Arsenic, organic compounds (as As)7440-38-20.5
Arsine7784-42-10.050.2
Asbestos; see 1915.1001
Azinphos-methyl86-50-00.2X
Barium, soluble compounds (as Ba)7440-39-30.5
Barium sulfate7727-43-7
Total dust   15
Respirable fraction   5
Benomyl17804-35-2
Total dust   15
Respirable fraction   5
Benzeneg; see §1915.102871-43-2
Benzidine; see §1915.101092-87-5
p-Benzoquinone; see Quinone
Benzo(a)pyrene; see Coal tar pitch volatiles
Benzoyl peroxide94-36-05
Benzyl chloride100-44-715
Beryllium and beryllium compounds (as Be); see 1915.1024(q)7440-41-70.002
Biphenyl; see Diphenyl
Bismuth telluride, Undoped1304-82-1
Total dust   15
Respirable fraction   5
Bisphenol A; see Diglycidyl ether
Boron oxide1303-86-2
Total dust   15
Boron tribromide10294-33-4110
Boron trifluoride7637-07-2(C)1(C)3
Bromine7726-95-60.10.7
Bromine pentafluoride7789-30-20.10.7
Bromoform75-25-20.55X
Butadiene (1,3-Butadiene); see 29 CFR 1910.1051; 29 CFR 1910.19(l)106-99-01
ppm/5
ppm
STEL
Butanethiol; see Butyl mercaptan
2-Butanone (Methyl ethyl ketone)78-93-3200590
2-Butoxyethanol111-76-250240X
n-Butyl-acetate123-86-4150710
sec-Butyl acetate105-46-4200950
tert-Butyl acetate540-88-5200950
n-Butyl alcohol71-36-3100300
sec-Butyl alcohol78-92-2150450
tert-Butyl alcohol75-65-0100300
Butylamine109-73-9(C)5(C)15X
tert-Butyl chromate (as CrO3); see 1915.1026n1189-85-1
n-Butyl glycidyl ether (BGE)2426-08-650270
Butyl mercaptan109-79-50.51.5
p-tert-Butyltoluene98-51-11060
Cadmium dust fume (as Cd); see 1915.10277440-43-9
Calcium carbonate1317-65-3
Total dust   15
Respirable fraction   5
Calcium hydroxide1305-62-0
Calcium hydroxide
Total dust   15
Respirable fraction   5
Calcium oxide1305-78-85
Calcium silicate1344-95-2
Total dust   15
Respirable fraction   5
Calcium sulfate7778-18-9
Total dust   15
Respirable fraction   5
Camphor, synthetic76-22-22
Carbaryl (Sevin)63-25-25
Carbon black1333-86-43.5
Carbon dioxide124-38-950009000
Carbon disulfide75-15-02060X
Carbon monoxide630-08-05055
Carbon tetrachloride56-23-51065X
Cellulose9004-34-6
Total dust   15
Respirable fraction   5
Chlordane57-74-90.5X
Chlorinated camphene8001-35-20.5X
Chlorinated diphenyl oxide55720-99-50.5
Chlorine7782-50-513
Chlorine trifluoride7790-91-2(C)0.1(C)0.4
Chloroacetaldehyde107-20-0(C)1(C)3
a-Chloroacetophenone (Phenacyl chloride)532-27-40.050.3
Chlorobenzene108-90-775350
o-Chlorobenzylidene malononitrile2698-41-10.050.4
Chlorobromomethane74-97-52001050
2-Chloro-1,3-butadiene; see beta-Chloroprene
Chlorodiphenyl (42% Chlorine) (PCB)53469-21-91X
Chlorodiphenyl (54% Chlorine) (PCB)11097-69-10.5X
1-Chloro,2,3-epoxypropane; see Epichlorohydrin
2-Chloroethanol; see Ethylene chlorohydrin
Chloroethylene; see Vinyl chloride
Chloroform (Trichloromethane)67-66-350240
bis(Chloromethyl) ether; see §1915.1008542-88-1
Chloromethyl methyl ether; see §1915.1006107-30-2
1-Chloro-1-nitropropane600-25-920100
Chloropicrin76-06-20.10.7
beta-Chloroprene126-99-82590X
2-Chloro-6-(trichloromethyl) pyridine1929-82-4
Total dust   15
Respirable fraction   5
Chromium (II) compounds
(as Cr)7440-47-30.5
Chromium (III) compounds
(as Cr)7440-47-30.5
Chromium (VI) compounds; see 1915.1026o
Chromium metal and insol. salts (as Cr)7440-47-31
Chrysene; see Coal tar pitch volatiles
Clopidol2971-90-6
Total dust   15
Respirable fraction   5
Coal tar pitch volatiles (benzene soluble fraction), anthracene, BaP, phenanthrene, acridine, chrysene, pyrene65966-93-20.2
Cobalt metal, dust, and fume (as Co)7440-48-40.1
Copper7440-50-8
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 isomers1319-77-3522X
Crotonaldehyde123-73-9;26
   4170-30-3
Cumene98-82-850245X
Cyanides (as CN)Varies with Compound5
Cyanogen460-19-510
Cyclohexane110-82-73001050
Cyclohexanol108-93-050200
Cyclohexanone108-94-150200
Cyclohexene110-83-83001015
Cyclonite121-82-41.5X
Cyclopentadiene542-92-775200
2,4-D (Dichlorophenoxyacetic acid)94-75-710
Decaborane17702-41-90.050.3X
Demeton (Systox)8065-48-30.1X
Diacetone alcohol (4-Hydroxy-4-methyl-2-pentanone)123-42-250240
1,2-Diaminoethane; see Ethylenediamine
Diazomethane334-88-30.20.4
Diborane19287-45-70.10.1
1,2-Dibromo-3-chloropropane (CBCP); see §1915.104496-12-8   
1,2-Dibromoethane; see Ethylene dibromide
Dibutyl phosphate107-66-415
Dibutyl phthalate84-74-25
Dichloroacetylene7572-29-4(C)0.1(C)0.4
o-Dichlorobenzene95-50-1(C)50(C)300
p-Dichlorobenzene106-46-775450
3,3′-Dichlorobenzidine; see §1915.100791-94-1
Dichlorodifluoromethane75-71-810004950
1,3-Dichloro-5,5-dimethyl hydantoin118-52-50.2
Dichlorodiphenyltrichloroethane (DDT)50-29-31X
1,1-Dichloroethane75-34-3100400
1,2-Dichloroethane; see Ethylene dichloride
1,2-Dichloroethylene540-59-0200790
Dichloroethyl ether111-44-4(C)15(C)90X
Dichloromethane; see Methylene chloride
Dichloromonofluoromethane75-43-410004200
1,1-Dichloro-1-nitroethane594-72-9(C)10(C)60
1,2-Dichloropropane; see Propylene dichloride
Dichlorotetrafluoroethane76-14-210007000
Dichlorvos (DDVP)62-73-71X
Dicyclopentadienyl iron102-54-5
Total dust   15
Respirable fraction   5
Dieldrin60-57-10.25X
Diethylamine109-89-72575
2-Diethylaminoethanol100-37-81050
Diethylene triamine111-40-0(C)10(C)42X
Diethyl ether; see Ethyl ether
Difluorodibromomethane75-61-6100860
Diglycidyl ether (DGE)2238-07-5(C)0.5(C)2.8
Dihydroxybenzene; see Hydroquinone
Diisobutyl ketone108-83-850290
Diisopropylamine108-18-9520X
4-Dimethylaminoazobenzene; see §1915.101560-11-7
Dimethoxymethane; see Methylal
Dimethyl acetamide127-19-51035X
Dimethylamine124-40-31018
Dimethylaminobenzene; see Xylidine
Dimethylaniline (N,N-Dimethylaniline)121-69-7525X
Dimethylbenzene; see Xylene
Dimethyl-1,2-dibromo- 2,2-dichloroethyl phosphate300-76-53
Dimethylformamide68-12-21030X
2,6-Dimethyl-4-heptanone; see Diisobutyl ketone
1,1-Dimethylhydrazine57-14-70.51X
Dimethylphthalate131-11-35
Dimethyl sulfate77-78-315X
Dinitrobenzene (all isomers)      1X
(ortho)528-29-0
(meta)99-65-0
(para)100-25-4
Dinitro-o-cresol534-52-10.2X
Dinitrotoluene25321-14-61.5X
Dioxane (Diethylene dioxide)123-91-1100360X
Diphenyl (Biphenyl)92-52-40.21
Diphenylamine122-39-410
Diphenylmethane diisocyanate; see Methylene bisphenyl isocyanate
Dipropylene glycol methyl ether34590-94-8100600X
Di-sec octyl phthalate (Di-(2-ethylhexyl) phthalate)117-81-75
Emery12415-34-8
Total dust   15
Respirable fraction   5
Endosulfan115-29-70.1X
Endrin72-20-80.1X
Epichlorohydrin106-89-8519X
EPN2104-64-50.5X
1,2-Epoxypropane; see Propylene oxide
2,3-Epoxy-1-propanol; see Glycidol
Ethane74-84-0E
Ethanethiol; see Ethyl mercaptan
Ethanolamine141-43-536
2-Ethoxyethanol (Cellosolve)110-80-5200740X
2-Ethoxyethyl acetate (Cellosolve acetate)111-15-9100540X
Ethyl acetate141-78-64001400
Ethyl acrylate140-88-525100X
Ethyl alcohol (Ethanol)64-17-510001900
Ethylamine75-04-71018
Ethyl amyl ketone (5-Methyl-3-heptanone)541-85-525130
Ethyl benzene100-41-4100435
Ethyl bromide74-96-4200890
Ethyl butyl ketone (3-Heptanone)106-35-450230
Ethyl chloride75-00-310002600
Ethyl ether60-29-74001200
Ethyl formate109-94-4100300
Ethyl mercaptan75-08-10.51
Ethyl silicate78-10-4100850
Ethylene74-85-1E
Ethylene chlorohydrin107-07-3516X
Ethylenediamine107-15-31025
Ethylene dibromide106-93-4(C)25(C)190X
Ethylene dichloride (1,2-Dichloroethane)107-06-250200
Ethylene glycol dinitrate628-96-6(C)0.2(C)1X
Ethylene glycol methyl acetate; see Methyl cellosolve acetate
Ethyleneimine; see §1915.1012151-56-4
Ethylene oxide; see §1915.104775-21-8
Ethylidene chloride; see 1,1-Dichloroethane
N-Ethylmorpholine100-74-32094X
Ferbam14484-64-1
Total dust   15
Ferrovanadium dust12604-58-91
Fibrous Glass
Total dust      15
Respirable fraction   5
Fluorides (as F)Varies with compound2.5
Fluorine7782-41-40.10.2
Fluorotrichloromethane (Trichlorofluoromethane)75-69-410005600
Formaldehyde; see §1915.104850-00-0
Formic acid64-18-659
Furfural98-01-1520X
Furfuryl alcohol98-00-050200
Gasoline8006-61-9   A3
Glycerin (mist)56-81-5
Total dust   15
Respirable fraction   5
Glycidol556-52-550150
Glycol monoethyl ether; see 2-Ethoxyethanol
Graphite, natural, respirable dust7782-42-5(2)(2)(2)
Graphite, synthetic
Total dust   15
Respirable fraction   5
Guthion; see Azinphos methyl
Gypsum13397-24-5
Total dust   15
Respirable fraction   5
Hafnium7440-58-60.5
Helium7440-59-7E
Heptachlor76-44-80.5X
Heptane (n-Heptane)142-82-55002000
Hexachloroethane67-72-1110X
Hexachloronaphthalene1335-87-10.2X
n-Hexane110-54-35001800
2-Hexanone (Methyl n-butyl ketone)591-78-6100410
Hexone (Methyl isobutyl ketone)108-10-1100410
sec-Hexyl acetate108-84-950300
Hydrazine302-01-211.3X
Hydrogen1333-74-0E
Hydrogen bromide10035-10-6310
Hydrogen chloride7647-01-0(C)5(C)7
Hydrogen cyanide74-90-81011X
Hydrogen fluoride (as F)7664-39-332
Hydrogen peroxide7722-84-111.4
Hydrogen selenide (as Se)7783-07-50.05
Hydrogen sulfide7783-06-41015
Hydroquinone123-31-92
Indene95-13-61045
Indium and compounds (as In)7440-74-60.1
Iodine7553-56-2(C)0.1(C)1
Iron oxide fume1309-37-110
Iron salts (soluble) (as Fe)Varies with compound1
Isoamyl acetate123-92-2100525
Isoamyl alcohol (primary and secondary)123-51-3100360
Isobutyl acetate110-19-0150700
Isobutyl alcohol78-83-1100300
Isophorone78-59-125140
Isopropyl acetate108-21-4250950
Isopropyl alcohol67-63-0400980
Isopropylamine75-31-0512
Isopropyl ether108-20-35002100
Isopropyl glycidyl ether (IGE)4016-14-250240
Kaolin1332-58-7
Total dust   15
Respirable fraction   5
Ketene463-51-40.50.9
Lead, inorganic (as Pb); see §1915.10257439-92-1
Limestone1317-65-3
Total dust   15
Respirable fraction   5
Lindane58-89-90.5X
Lithium hydride7580-67-80.025
L.P.G. (Liquefied petroleum gas)68476-85-710001800
Magnesite546-93-0
Total dust   15
Respirable fraction   5
Magnesium oxide fume1309-48-4
Total particulate   15
Malathion121-75-5
Total dust   15X
Maleic anhydride108-31-60.25
Manganese compounds (as Mn)7439-96-5(C)5
Manganese fume (as Mn)7439-96-5(C)5
Marble1317-65-3
Total dust   15
Respirable fraction   5
Mercury (aryl and inorganic)(as Hg)7439-97-6   0.1X
Mercury (organo) alkyl compounds (as Hg)7439-97-60.01X
Mercury (vapor) (as Hg)7439-97-60.1X
Mesityl oxide141-79-725100
Methane74-82-8E
Methanethiol; see Methyl mercaptan
Methoxychlor72-43-5
Total dust   15
2-Methoxyethanol (Methyl cellosolve)109-86-42580X
2-Methoxyethyl acetate (Methyl cellosolve acetate)110-49-625120X
Methyl acetate79-20-9200610
Methyl acetylene (Propyne)74-99-710001650
Methyl acetylene-propadiene mixture (MAPP)   10001800
Methyl acrylate96-33-31035X
Methylal (Dimethoxy-methane)109-87-510003100
Methyl alcohol67-56-1200260
Methylamine74-89-51012
Methyl amyl alcohol; see Methyl isobutyl carbinol
Methyl n-amyl ketone110-43-0100465
Methyl bromide74-83-9(C)20(C)80X
Methyl butyl ketone; see 2-Hexanone
Methyl cellosolve; see 2-Methoxyethanol
Methyl cellosolve acetate; see 2-Methoxyethyl acetate
Methyl chloride74-87-3100210
Methyl chloroform (1,1,1-Trichloroethane)71-55-63501900
Methylcyclohexane108-87-25002000
Methylcyclohexanol25639-42-3100470
o-Methylcyclohexanone583-60-8100460X
Methylene chloride; see §1910.1052
Methyl ethyl ketone (MEK); see 2-Butanone
Methyl formate107-31-3100250
Methyl hydrazine (Monomethyl hydrazine)60-34-4(C)0.2(C)0.35X
Methyl iodide74-88-4528X
Methyl isoamyl ketone110-12-3100475
Methyl isobutyl carbinol108-11-225100X
Methyl isobutyl ketone; see Hexone
Methyl isocyanate624-83-90.020.05X
Methyl mercaptan74-93-10.51
Methyl methacrylate80-62-6100410100
Methyl propyl ketone; see 2-Pentanone
Methyl silicate681-84-5530
alpha-Methyl styrene98-83-9(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 aniline100-61-829X
Monomethyl hydrazine; see Methyl hydrazine
Morpholine110-91-82070X
Naphtha (Coal tar)8030-30-6100400
Naphthalene91-20-31050
alpha-Naphthylamine; see §1915.1004134-32-7
beta-Naphthylamine; see §1915.100991-59-8      
Neon7440-01-9
Nickel carbonyl (as Ni)13463-39-30.0010.007
Nickel, metal and insoluble compounds (as Ni)7440-02-01
Nickel, soluble compounds (as Ni)7440-02-01
Nicotine54-11-50.5X
Nitric acid7697-37-225
Nitric oxide10102-43-92530
p-Nitroaniline100-01-616X
Nitrobenzene98-95-315X
p-Nitrochlorobenzene100-00-51X
4-Nitrodiphenyl; see §1915.100392-93-3
Nitroethane79-24-3100310
Nitrogen7727-37-9E
Nitrogen dioxide10102-44-0(C)5(C)9
Nitrogen trifluoride7783-54-21029
Nitroglycerin55-63-0(C)0.2(C)2X
Nitromethane75-52-5100250
1-Nitropropane108-03-22590
2-Nitropropane79-46-92590
N-Nitrosodimethylamine; see §1915.101662-79-9      
Nitrotoluene (all isomers)   530X
o-isomer88-72-2;
m-isomer99-08-1;
p-isomer99-99-0
Nitrotrichloromethane; see Chloropicrin
Nitrous oxide10024-97-2E
Octachloronaphthalene2234-13-10.1X
Octane111-65-94001900
Oil mist, mineral8012-95-15
Osmium tetroxide (as Os)20816-12-00.002
Oxalic acid144-62-71
Oxygen difluoride7783-41-70.050.1
Ozone10028-15-60.10.2
Paraquat, respirable dust4685-14-7;0.5X
   1910-42-5;
   2074-50-2
Parathion56-38-20.1
Particulates not otherwise regulated
Total dust organic and inorganic   15
PCB; see Chlorodiphenyl (42% and 54% chlorine)
Pentaborane19624-22-70.0050.01
Pentachloronaphthalene1321-64-80.5X
Pentachlorophenol87-86-50.5X
Pentaerythritol115-77-5
Total dust   15
Respirable fraction   5
Pentane109-66-05001500
2-Pentanone (Methyl propyl ketone)107-87-9200700
Perchloroethylene (Tetrachloroethylene)127-18-4100670
Perchloromethyl mercaptan594-42-30.10.8
Perchloryl fluoride7616-94-6313.5
Perlite93763-70-3
Total dust   15
Respirable fraction   5
Petroleum distillates (Naphtha)(Rubber Solvent)      A3
Phenol108-95-2519X
p-Phenylene diamine106-50-30.1X
Phenyl ether, vapor101-84-817
Phenyl ether-biphenyl mixture, vapor   17
Phenylethylene; see Styrene
Phenyl glycidyl ether (PGE)122-60-11060
Phenylhydrazine100-63-0522X
Phosdrin (Mevinphos)7786-34-70.1X
Phosgene (Carbonyl chloride)75-44-50.10.4
Phosphine7803-51-20.30.4
Phosphoric acid7664-38-21
Phosphorus (yellow)7723-14-00.1
Phosphorus pentachloride10026-13-81
Phosphorus pentasulfide1314-80-31
Phosphorus trichloride7719-12-20.53
Phthalic anhydride85-44-9212
Picloram1918-02-1
Total dust   15
Respirable fraction   5
Picric acid88-89-10.1
Piperazine dihydrochloride142-64-3X
Pindone (2-Pivalyl-1,3-indandione)83-26-10.1
Plaster of Paris26499-65-0
Total dust   15
Respirable fraction   5
Platinum (as Pt)7440-06-4
Metal   
Soluble salts   0.002
Polytetrafluoroethylene decomposition products      A2
Portland cement65997-15-1
Total dust   1510
Respirable fraction   5
Propargyl alcohol107-19-71X
beta-Propriolactone; see §1915.101357-57-8
Propionic acid79-09-4
n-Propyl acetate109-60-4200840
n-Propyl alcohol71-23-8200500
n-Propyl nitrate627-13-425110
Propylene dichloride78-87-575350
Propylene imine75-55-825X
Propylene oxide75-56-9100240
Propyne; see Methyl acetylene
Pyrethrum8003-34-75
Pyridine110-86-1515
Quinone106-51-40.10.4
RDX; see Cyclonite
Rhodium (as Rh), metal fume and insoluble compounds7440-16-60.1
Rhodium (as Rh), soluble compounds7440-16-60.001
Ronnel299-84-310
Rotenone83-79-45
Rouge   
Total dust   15
Respirable fraction   5
Selenium compounds (as Se)7782-49-20.2
Selenium hexafluoride (as Se)7783-79-10.050.4
Silica, amorphous, precipitated and gel112926-00-8(2)(2)(2)
Silica, amorphous, diatomaceous earth, containing less than 1% crystalline silica61790-53-2(2)(2)(2)
Silica, crystalline, respirable dust
Cristobalite; see 1915.105314464-46-1
Quartz; see 1915.1053514808-60-7
Tripoli (as quartz); see 1915.105351317-95-9
Tridymite; see 1915.105315468-32-3
Silica, fused, respirable dust60676-86-0(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 dust14807-96-6(2)(2)(2)
Tremolite, asbestiform   (3)(3)(3)
Silicon7440-21-3
Total dust   15
Respirable fraction   5
Silicon carbide409-21-2
Total dust   15
Respirable fraction   5
Silver, metal and soluble compounds (as Ag)7440-22-40.01
Soapstone; see Silicates
Sodium fluoroacetate62-74-80.05X
Sodium hydroxide1310-73-22
Starch9005-25-8
Total dust   15
Respirable fraction   5
Stibine7803-52-30.10.5
Stoddard solvent8052-41-32001150
Strychnine57-24-90.15
Styrene100-42-510042050
Sucrose57-50-1
Total dust   15
Respirable fraction   5
Sulfur dioxide7446-09-5513
Sulfur hexafluoride2551-62-410006000
Sulfuric acid7664-93-91
Sulfur monochloride10025-67-916
Sulfur pentafluoride5714-22-70.0250.25
Sulfuryl fluoride2699-79-8520
Systox, see Demeton
2,4,5-T (2,4,5-trichlorophenoxyacetic acid)93-76-510
Talc; see Silicates—
Tantalum, metal and oxide dust7440-25-75
TEDP (Sulfotep)3689-24-50.2X
Teflon decomposition products      A2
Tellurium and compounds (as Te)13494-80-90.1
Tellurium hexafluoride (as Te)7783-80-40.020.2
Temephos3383-96-8
Total dust   15
Respirable fraction   5
TEPP (Tetraethyl pyrophosphate)107-49-30.05X
Terphenyls26140-60-3(C)1(C)9
1,1,1,2-Tetrachloro-2,2-difluoroethane76-11-95004170
1,1,2,2-Tetrachloro-1,2-difluoroethane76-12-05004170
1,1,2,2-Tetrachloroethane79-34-5535X
Tetrachloroethylene; see Perchloroethylene
Tetrachloromethane; see Carbon tetrachloride
Tetrachloronaphthalene1335-88-22X
Tetraethyl lead (as Pb)78-00-20.1X
Tetrahydrofuran109-99-9200590
Tetramethyl lead, (as Pb)75-74-10.15X
Tetramethyl succinonitrile3333-52-60.53X
Tetranitromethane509-14-818
Tetryl (2,4,6-Trinitrophenylmethylnitramine)479-45-81.5X
Thallium, soluble compounds (as Tl)7440-28-00.1X
4,4′-Thiobis (6-tert, Butyl-m-cresol)96-69-5
Total dust   15
Respirable fraction   5
Thiram137-26-85
Tin, inorganic compounds (except oxides) (as Sn)7440-31-52
Tin, organic compounds (as Sn)7440-31-50.1
Tin oxide (as Sn)21651-19-4
Total dust   15
Respirable fraction   5
Titanium dioxide13463-67-7
Total dust   15
Toluene108-88-3200750100
Toluene-2,4-diisocyanate (TDI)584-84-9(C)0.02(C)0.14
o-Toluidine95-53-4522X
Toxaphene; see Chlorinated camphene
Tremolite; see Silicates
Tributyl phosphate126-73-85
1,1,1-Trichloroethane; see Methyl chloroform
1,1,2-Trichloroethane79-00-51045X
Trichloroethylene79-01-6100535
Trichloromethane; see Chloroform
Trichloronaphthalene1321-65-95X
1,2,3-Trichloropropane96-18-450300
1,1,2-Trichloro-1,2,2-trifluoroethane76-13-110007600
Triethylamine121-44-825100
Trifluorobromomethane75-63-810006100
Trimethyl benzene25551-13-725120
2,4,6-Trinitrophenyl; see Picric acid
2,4,6-Trinitrophenylmethylnitramine; see Tetryl
2,4,6-Trinitrotoluene (TNT)118-96-71.5X
Triorthocresyl phosphate78-30-80.1
Triphenyl phosphate115-86-63
Tungsten (as W)7440-33-7
Insoluble compounds   5
Soluble compounds   1
Turpentine8006-64-2100560
Uranium (as U)7440-61-1
Soluble compounds   0.2
Insoluble compounds   0.2
Vanadium1314-62-1
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 §1915.101775-01-4
Vinyl cyanide; see Acrylonitrile
Vinyl toluene25013-15-4100480
Warfarin81-81-20.1
Xylenes (o-, m-, p-isomers)1330-20-7100435
Xylidine1300-73-8525X
Yttrium7440-65-51
Zinc chloride fume7646-85-71
Zinc oxide fume1314-13-25
Zinc oxide1314-13-2
Total dust   15
Respirable fraction   5
Zinc stearate557-05-1
Total dust   15
Respirable fraction   5
Zirconium compounds (as Zr)7440-67-75

Mineral Dusts

Substancemppcf(j)
SILICA:
Crystalline250(k)
Quartz. Threshold Limit calculated from the formula(p)% SiO2 + 5
Cristobalite
Amorphous, including natural diatomaceous earth20
SILICATES (less than 1% crystalline silica)
Mica20
Portland cement50
Soapstone20
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.
   

Footnotes to Table Z—Shipyards:

1[Reserved]

2See Mineral Dusts Table.

3Use Asbestos Limit §1915.1001.

4See 1915.1001.

5See Mineral Dusts table for the exposure limit for any operations or sectors where the exposure limit in §1915.1053 is stayed or is otherwise not in effect.

*The PELs are 8-hour TWAs unless otherwise noted; a (C) designation denotes a ceiling limit. They are to be determined from breathing-zone air samples.

aParts of vapor or gas per million parts of contaminated air by volume at 25 °C and 760 torr.

bMilligrams of substance per cubic meter of air. When entry is in this column only, the value is exact; when listed with a ppm entry, it is approximate.

c[Reserved]

dThe CAS number is for information only. Enforcement is based on the substance name. For an entry covering more than one metal compound, measured as the metal, the CAS number for the metal is given—not CAS numbers for the individual compounds.

e-f[Reserved]

gFor sectors excluded from §1915.1028 the limit is 10 ppm TWA.

hWhere OSHA has published a proposal for a substance but has not issued a final rule, the proposal is referenced and the existing limit is published.

i[Reserved]

jMillions of particles per cubic foot of air, based on impinger samples counted by light-field techniques.

kThe percentage of crystalline silica in the formula is the amount determined from airborne samples, except in those instances in which other methods have been shown to be applicable.

mCovers all organic and inorganic particulates not otherwise regulated. Same as Particulates Not Otherwise Regulated.

nIf the exposure limit in §1915.1026 is stayed or is otherwise not in effect, the exposure limit is a ceiling of 0.1 mg/m3.

oIf the exposure limit in §1915.1026 is stayed or is otherwise not in effect, the exposure limit is 0.1 mg/m3 (as CrO3) as an 8-hour TWA.

pThis standard applies to any operations or sectors for which the respirable crystalline silica standard, 1915.1053, is stayed or otherwise is not in effect.

qThis standard applies to any operations or sectors for which the beryllium standard, 1915.1024, is stayed or otherwise is not in effect.

The 1970 TLV uses letter designations instead of a numerical value as follows:

A1 [Reserved]

A2 Polytetrafluoroethylene decomposition products. Because these products decompose in part by hydrolysis in alkaline solution, they can be quantitatively determined in air as fluoride to provide an index of exposure. No TLV is recommended pending determination of the toxicity of the products, but air concentrations should be minimal.

A3 Gasoline and/or Petroleum Distillates. The composition of these materials varies greatly and thus a single TLV for all types of these materials is no longer applicable. The content of benzene, other aromatics and additives should be determined to arrive at the appropriate TLV.

E Simple asphyxiants. The limiting factor is the available oxygen which shall be at least 18% and be within the requirement addressing explosion in subpart B of part 1915.

[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]

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