Title 29: Labor
PART 1915—OCCUPATIONAL SAFETY AND HEALTH STANDARDS FOR SHIPYARD EMPLOYMENT
Subpart Z—Toxic and Hazardous Substances
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§ 1915.1000 Air contaminants.
Wherever this section applies, an employees'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 p/m
Two hours exposure at 75 p/m
Four hours exposure at 50 p/m
Substituting this information in the formula, we have
(2×150+2×75+4×50)÷8=81.25 p/m
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:
------------------------------------------------------------------------ Actual concentration 8 hr. TWA PEL Substance of 8 hour (ppm) exposure (ppm)------------------------------------------------------------------------B....................................... 500 1000C....................................... 45 200D....................................... 40 200------------------------------------------------------------------------Substituting in the formula, we have:Em=500÷1,000+45÷200+40÷200Em=0.500+0.225+0.200Em=0.925
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Since Em is less than unity (1), the exposure combination is within acceptable limits.
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Table Z_Shipyards---------------------------------------------------------------------------------------------------------------- ppm mg/m Skin Substance CAS No. \d\ \a,*\ \3,b,*\ 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................. 53-96-3Acetylene................................................... 74-86-2 EAcetylene 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 XAcrylonitrile; see § 1915.1045......................... 107-13-1Aldrin...................................................... 309-00-2 _ 0.25 XAllyl alcohol............................................... 107-18-6 2 5 XAllyl 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....................... 92-67-12-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 XAnisidine (o-, p-isomers)................................... 29191-52-4 _ 0.5 XAntimony and compounds (as Sb).............................. 7440-36-0 _ 0.5 _ANTU (alpha Naphthylthiourea)............................... 86-88-4 _ 0.3 _Argon....................................................... 7440-37-1 EArsenic, 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 XBarium, 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 _Benzene \g\; see § 1915.1028........................... 71-43-2Benzidine; see § 1915.1010............................. 92-87-5p-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)................... 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 XButadiene (1,3-Butadiene); see 29 CFR 1910.1051; 29 CFR 106-99-0 1 _ _ 1910.19(l)................................................. ppm/5 ppm STELButanethiol; see Butyl mercaptan............................2-Butanone (Methyl ethyl ketone)............................ 78-93-3 200 590 _2-Butoxyethanol............................................. 111-76-2 50 240 Xn-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 Xtert-Butyl chromate (as CrO3); see 1915.1026 \n\............ 1189-85-1n-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 XCarbon monoxide............................................. 630-08-0 50 55 _Carbon tetrachloride........................................ 56-23-5 10 65 XCellulose................................................... 9004-34-6 Total dust.............................................. ............... _ 15 _ Respirable fraction..................................... ............... _ 5 _Chlordane................................................... 57-74-9 _ 0.5 XChlorinated camphene........................................ 8001-35-2 _ 0.5 XChlorinated 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 XChlorodiphenyl (54% Chlorine) (PCB)......................... 11097-69-1 _ 0.5 X1-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............... 542-88-1Chloromethyl methyl ether; see § 1915.1006............. 107-30-21-Chloro-1-nitropropane..................................... 600-25-9 20 100 _Chloropicrin................................................ 76-06-2 0.1 0.7beta-Chloroprene............................................ 126-99-8 25 90 X2-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 1915.1026 \o\..................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), 65966-93-2 _ 0.2 _ anthracene, BaP, phenanthrene, acridine, chrysene, pyrene..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)........................................... ............... _ 1Crag herbicide (Sesone)..................................... 136-78-7 Total dust.............................................. ............... _ 15 _ Respirable fraction..................................... ............... _ 5 _Cresol, all isomers......................................... 1319-77-3 5 22 XCrotonaldehyde.............................................. 123-73-9; 2 6 4170-30-3Cumene...................................................... 98-82-8 50 245 XCyanides (as CN)............................................ Varies with _ 5 _ CompoundCyanogen.................................................... 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 XCyclopentadiene............................................. 542-92-7 75 200 _2,4-D (Dichlorophenoxyacetic acid).......................... 94-75-7 _ 10 _Decaborane.................................................. 17702-41-9 0.05 0.3 XDemeton (Systox)............................................ 8065-48-3 _ 0.1 XDiacetone 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[prime]-Dichlorobenzidine; see § 1915.1007.......... 91-94-1Dichlorodifluoromethane..................................... 75-71-8 1000 4950 _1,3-Dichloro-5,5-dimethyl hydantoin......................... 118-52-5 _ 0.2 _Dichlorodiphenyltrichloroethane (DDT)....................... 50-29-3 _ 1 X1,1-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 XDichloromethane; 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 XDicyclopentadienyl iron..................................... 102-54-5 Total dust.............................................. ............... _ 15 _ Respirable fraction..................................... ............... _ 5 _Dieldrin.................................................... 60-57-1 _ 0.25 XDiethylamine................................................ 109-89-7 25 75 _2-Diethylaminoethanol....................................... 100-37-8 10 50 _Diethylene triamine......................................... 111-40-0 (C)10 (C)42 XDiethyl 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 X4-Dimethylaminoazobenzene; see § 1915.1015............. 60-11-7Dimethoxymethane; see Methylal..............................Dimethyl acetamide.......................................... 127-19-5 10 35 XDimethylamine............................................... 124-40-3 10 18 _Dimethylaminobenzene; see Xylidine..........................Dimethylaniline (N,N-Dimethylaniline)....................... 121-69-7 5 25 XDimethylbenzene; see Xylene.................................Dimethyl-1,2-dibromo- 2,2-dichloroethyl phosphate........... 300-76-5 _ 3 _Dimethylformamide........................................... 68-12-2 10 30 X2,6-Dimethyl-4-heptanone; see Diisobutyl ketone.............1,1-Dimethylhydrazine....................................... 57-14-7 0.5 1 XDimethylphthalate........................................... 131-11-3 _ 5 _Dimethyl sulfate............................................ 77-78-3 1 5 XDinitrobenzene (all isomers)................................ ............... ....... 1 X (ortho)................................................. 528-29-0 (meta).................................................. 99-65-0 (para).................................................. 100-25-4Dinitro-o-cresol............................................ 534-52-1 _ 0.2 XDinitrotoluene.............................................. 25321-14-6 _ 1.5 XDioxane (Diethylene dioxide)................................ 123-91-1 100 360 XDiphenyl (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 XDi-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 XEndrin...................................................... 72-20-8 _ 0.1 XEpichlorohydrin............................................. 106-89-8 5 19 XEPN......................................................... 2104-64-5 _ 0.5 X1,2-Epoxypropane; see Propylene oxide.......................2,3-Epoxy-1-propanol; see Glycidol..........................Ethane...................................................... 74-84-0 EEthanethiol; see Ethyl mercaptan............................Ethanolamine................................................ 141-43-5 3 6 _2-Ethoxyethanol (Cellosolve)................................ 110-80-5 200 740 X2-Ethoxyethyl acetate (Cellosolve acetate).................. 111-15-9 100 540 XEthyl acetate............................................... 141-78-6 400 1400 _Ethyl acrylate.............................................. 140-88-5 25 100 XEthyl 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 EEthylene chlorohydrin....................................... 107-07-3 5 16 XEthylenediamine............................................. 107-15-3 10 25 _Ethylene dibromide.......................................... 106-93-4 (C)25 (C)190 XEthylene dichloride (1,2-Dichloroethane).................... 107-06-2 50 200 _Ethylene glycol dinitrate................................... 628-96-6 (C)0.2 (C)1 XEthylene glycol methyl acetate; see Methyl cellosolve acetate....................................................Ethyleneimine; see § 1915.1012......................... 151-56-4Ethylene oxide; see § 1915.1047........................ 75-21-8Ethylidene chloride; see 1,1-Dichloroethane.................N-Ethylmorpholine........................................... 100-74-3 20 94 XFerbam...................................................... 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 _ 2.5 _ compoundFluorine.................................................... 7782-41-4 0.1 0.2 _Fluorotrichloromethane (Trichlorofluoromethane)............. 75-69-4 1000 5600 _Formaldehyde; see § 1915.1048.......................... 50-00-0Formic acid................................................. 64-18-6 5 9 _Furfural.................................................... 98-01-1 5 20 XFurfuryl alcohol............................................ 98-00-0 50 200 _Gasoline.................................................... 8006-61-9 ....... A \3\ _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 EHeptachlor.................................................. 76-44-8 _ 0.5 XHeptane (n-Heptane)......................................... 142-82-5 500 2000 _Hexachloroethane............................................ 67-72-1 1 10 XHexachloronaphthalene....................................... 1335-87-1 _ 0.2 Xn-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 XHydrogen.................................................... 1333-74-0 EHydrogen bromide............................................ 10035-10-6 3 10 _Hydrogen chloride........................................... 7647-01-0 (C)5 (C)7 _Hydrogen cyanide............................................ 74-90-8 10 11 XHydrogen fluoride (as F).................................... 7664-39-3 3 2 _Hydrogen peroxide........................................... 7722-84-1 1 1.4 _Hydrogen selenide (as Se)................................... 7783-07-5 0.05Hydrogen 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 _ 1 _ compoundIsoamyl 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 XLithium hydride............................................. 7580-67-8 _ 0.025 _L.P.G. (Liquefied petroleum gas)............................ 68476-85-7 1000 1800Magnesite................................................... 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 XMaleic anhydride............................................ 108-31-6 0.25Manganese 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 XMercury (organo) alkyl compounds (as Hg).................... 7439-97-6 _ 0.01 XMercury (vapor) (as Hg)..................................... 7439-97-6 _ 0.1 XMesityl oxide............................................... 141-79-7 25 100 _Methane..................................................... 74-82-8 EMethanethiol; see Methyl mercaptan..........................Methoxychlor................................................ 72-43-5 Total dust.............................................. ............... _ 15 _2-Methoxyethanol (Methyl cellosolve)........................ 109-86-4 25 80 X2-Methoxyethyl acetate (Methyl cellosolve acetate).......... 110-49-6 25 120 XMethyl 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 XMethylal (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 XMethyl 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 XMethylene 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 XMethyl iodide............................................... 74-88-4 5 28 XMethyl isoamyl ketone....................................... 110-12-3 100 475 _Methyl isobutyl carbinol.................................... 108-11-2 25 100 XMethyl isobutyl ketone; see Hexone..........................Methyl isocyanate........................................... 624-83-9 0.02 0.05 XMethyl mercaptan............................................ 74-93-1 0.5 1 _Methyl methacrylate......................................... 80-62-6 100 410 100Methyl 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 XMonomethyl hydrazine; see Methyl hydrazine..................Morpholine.................................................. 110-91-8 20 70 XNaphtha (Coal tar).......................................... 8030-30-6 100 400 _Naphthalene................................................. 91-20-3 10 50 _alpha-Naphthylamine; see § 1915.1004................... 134-32-7beta-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 XNitric acid................................................. 7697-37-2 2 5 _Nitric oxide................................................ 10102-43-9 25 30 _p-Nitroaniline.............................................. 100-01-6 1 6 XNitrobenzene................................................ 98-95-3 1 5 Xp-Nitrochlorobenzene........................................ 100-00-5 _ 1 X4-Nitrodiphenyl; see § 1915.1003....................... 92-93-3Nitroethane................................................. 79-24-3 100 310 _Nitrogen.................................................... 7727-37-9 ENitrogen dioxide............................................ 10102-44-0 (C)5 (C)9 _Nitrogen trifluoride........................................ 7783-54-2 10 29 _Nitroglycerin............................................... 55-63-0 (C)0.2 (C)2 XNitromethane................................................ 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................................................ 99-99-0Nitrotrichloromethane; see Chloropicrin.....................Nitrous oxide............................................... 10024-97-2 EOctachloronaphthalene....................................... 2234-13-1 _ 0.1 XOctane...................................................... 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; 2074-50-2Parathion................................................... 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 XPentachlorophenol........................................... 87-86-5 _ 0.5 XPentaerythritol............................................. 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)............. ............... ....... A \3\ _Phenol...................................................... 108-95-2 5 19 Xp-Phenylene diamine......................................... 106-50-3 _ 0.1 XPhenyl 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 XPhosdrin (Mevinphos)........................................ 7786-34-7 _ 0.1 XPhosgene (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 _ _ XPindone (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.............. ............... ....... A \2\Portland cement............................................. 65997-15-1 Total dust.............................................. ............... 15 _ 10 Respirable fraction..................................... ............... 5 _ _Propargyl alcohol........................................... 107-19-7 1 _ Xbeta-Propriolactone; see § 1915.1013................... 57-57-8Propionic 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 XPropylene 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 61790-53-2 (\2\) (\2\) (\2\) 1% crystalline silica......................................Silica, crystalline cristobalite, respirable dust........... 14464-46-1 (\2\) (\2\) (\2\)Silica, crystalline quartz, respirable dust................. 14808-60-7 (\2\) (\2\) (\2\)Silica, crystalline tripoli (as quartz), respirable dust.... 1317-95-9 (\2\) (\2\) (\2\)Silica, crystalline tridymite, respirable dust.............. 15468-32-3 (\2\) (\2\) (\2\)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 XSodium 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 50Sucrose..................................................... 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 XTeflon decomposition products............................... ............... ....... A2Tellurium 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 XTerphenyls.................................................. 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 XTetrachloroethylene; see Perchloroethylene..................Tetrachloromethane; see Carbon tetrachloride................Tetrachloronaphthalene...................................... 1335-88-2 _ 2 XTetraethyl lead (as Pb)..................................... 78-00-2 _ 0.1 XTetrahydrofuran............................................. 109-99-9 200 590 _Tetramethyl lead, (as Pb)................................... 75-74-1 _ 0.15 XTetramethyl succinonitrile.................................. 3333-52-6 0.5 3 XTetranitromethane........................................... 509-14-8 1 8 _Tetryl (2,4,6-Trinitrophenylmethylnitramine)................ 479-45-8 _ 1.5 XThallium, soluble compounds (as Tl)......................... 7440-28-0 _ 0.1 X4,4[prime]-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 100Toluene-2,4-diisocyanate (TDI).............................. 584-84-9 (C)0.02 (C)0.14 _o-Toluidine................................................. 95-53-4 5 22 XToxaphene; 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 XTrichloroethylene........................................... 79-01-6 100 535 _Trichloromethane; see Chloroform............................Trichloronaphthalene........................................ 1321-65-9 _ 5 X1,2,3-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 XTriorthocresyl 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........................ 75-01-4Vinyl 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 XYttrium..................................................... 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: CrystallineQuartz. Threshold Limit calculated from the 250 (k) formula....................................... ------------------------ %SiO2+5Cristobalite................................... Amorphous, including natural diatomaceous 20 earth.......................................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/m\3\ whichever is the smaller) of total dust <1% SiO2------------------------------------------------------------------------ Conversion factors...........................mppcf x 35.3 = million particles per cubic meter = particles per c.c.
------------------------------------------------------------------------ Footnotes to Table Z_Shipyards:\1\ [Reserved]\2\ See Mineral Dusts Table.\3\ Use Asbestos Limit § 1915.1001.\4\ See 1915.1001.* 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.\a\ Parts of vapor or gas per million parts of contaminated air by volume at 25° C and 760 torr.\b\ Milligrams 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]\d\ The 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]\g\ For sectors excluded from § 1915.1028 the limit is 10 ppm TWA.\h\ Where 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]\j\ Millions of particles per cubic foot of air, based on impinger samples counted by light-field techniques.\k\ The 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.\m\ Covers all organic and inorganic particulates not otherwise regulated. Same as Particulates Not Otherwise Regulated.\n\ If the exposure limit in § 1915.1026 is stayed or is otherwise not in effect, the exposure limit is a ceiling of 0.1 mg/m\3\.\o\ If the exposure limit in § 1915.1026 is stayed or is otherwise not in effect, the exposure limit is 0.1 mg/m\3\ (as CrO3) as an 8- hour TWA.The 1970 TLV uses letter designations instead of a numerical value as follows:A \1\ [Reserved]A \2\ 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.A \3\ 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.
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[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]
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