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.
(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
(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 ppmTwo hours exposure at 75 ppmFour hours exposure at 50 ppm
Substituting this information in the formula, we have(2 x 150 + 2 x 75 + 4 x 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
(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 Since Em is less than unity (1), the exposure combination is within acceptable limits.
Table Z--Shipyards----------------------------------------------------------------------------------------------------------------
ppm \a mg/m \3 Skin
Substance CAS No. \d\ *\ 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 Sec. 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 Sec. 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 Sec. 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 Sec. 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 Sec. 1915.1028........................... 71-43-2Benzidine; see Sec. 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 Sec. 1915.1008............... 542-88-1Chloromethyl methyl ether; see Sec. 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 Sec. 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 Sec. 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 Sec. 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 Sec. 1915.1012......................... 151-56-4Ethylene oxide; see Sec. 1915.1047........................ 75-21-8
Ethylidene 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 Sec. 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 Sec. 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 X
Methylene chloride; see Sec. 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 Sec. 1915.1004................... 134-32-7beta-Naphthylamine; see Sec. 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 Sec. 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 Sec. 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 Sec. 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 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'-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 Sec. 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+5
Cristobalite...................................
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 Sec. 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 [deg]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 Sec. 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 Sec. 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 Sec. 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. [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]