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29 C.F.R. § 1926.55

Gases, vapors, fumes, dusts, and mists.

§ 1926.55 Gases, vapors, fumes, dusts, and mists.

(a) Employers must limit an employee's exposure to any substance listed in Table 1 or 2 of this section in accordance with the following:

(1) Substances with limits preceded by (C)—Ceiling Values. An employee's exposure, as determined from breathing-zone air samples, to any substance in Table 1 of this section with a permissible exposure limit preceded by (C) must at no time exceed the exposure limit specified for that substance. If instantaneous monitoring is not feasible, then the employer must assess the ceiling as a 15-minute time-weighted average exposure that the employer cannot exceed at any time during the working day.

(2) Other substances—8-hour Time Weighted Averages. An employee's exposure, as determined from breathing-zone air samples, to any substance in Table 1 or 2 of this section with a permissible exposure limit not preceded by (C) must not exceed the limit specified for that substance measured as an 8-hour time-weighted average in any work shift.

(b) To achieve compliance with paragraph (a) of this section, administrative or engineering controls must first be implemented whenever feasible. When such controls are not feasible to achieve full compliance, protective equipment or other protective measures shall be used to keep the exposure of employees to air contaminants within the limits prescribed in this section. Any equipment and technical measures used for this purpose must first be approved for each particular use by a competent industrial hygienist or other technically qualified person. Whenever respirators are used, their use shall comply with § 1926.103.

(c) Paragraphs (a) and (b) of this section do not apply to the exposure of employees to airborne asbestos, tremolite, anthophyllite, or actinolite dust. Whenever any employee is exposed to airborne asbestos, tremolite, anthophyllite, or actinolite dust, the requirements of § 1926.1101 shall apply.

(d) Paragraphs (a) and (b) of this section do not apply to the exposure of employees to formaldehyde. Whenever any employee is exposed to formaldehyde, the requirements of § 1910.1048 of this title shall apply.

Table 1 to § 1926.55—Permissible Exposure Limits for Airborne Contaminants

Substance CAS No. dppm amg/m 3 bSkin
designation *
Abate; see Temephos
Acetaldehyde75–07–0200360—
Acetic acid64–19–71025—
Acetic anhydride108–24–7520—
Acetone67–64–110002400—
Acetonitrile75–05–84070—
2-Acetylaminofluorine; see § 1926.111453–96–3
Acetylene74–86–2E
Acetylene dichloride; see 1,2-Dichloroethylene
Acetylene tetrabromide79–27–6114—
Acrolein107–02–80.10.25—
Acrylamide79–06–1—0.3X
Acrylonitrile; see § 1926.1145107–13–1
Aldrin309–00–2—0.25X
Allyl alcohol107–18–625X
Allyl chloride107–05–113—
Allyl glycidyl ether (AGE)106–92–3(C)10(C)45—
Allyl propyl disulfide2179–59–1212—
alpha-Alumina1344–28–1
Total dust——
Respirable fraction——
Alundum; see alpha-Alumina
4-Aminodiphenyl; see § 1926.111192–67–1
2-Aminoethanol; see Ethanolamine
2-Aminopyridine504–29–00.52—
Ammonia7664–41–75035—
Ammonium sulfamate7773–06–0
Total dust—15—
Respirable fraction—5—
n-Amyl acetate628–63–7100525—
sec-Amyl acetate626–38–0125650—
Aniline and homologs62–53–3519X
Anisidine (o-, p-isomers)29191–52–4—0.5X
Antimony and compounds (as Sb)7440–36–0—0.5—
ANTU (alpha Naphthylthiourea)86–88–4—0.3—
Argon7440–37–1E
Arsenic, inorganic compounds (as As); see § 1926.11187440–38–2———
Arsenic, organic compounds (as As)7440–38–2—0.5—
Arsine7784–42–10.050.2—
Asbestos; see § 1926.1101
Azinphos-methyl86–50–0—0.2X
Barium, soluble compounds (as Ba)7440–39–3—0.5—
Benzene g; see § 1926.112871–43–2
Benzidine; see § 1926.111092–87–5
p-Benzoquinone; see Quinone
Benzo(a)pyrene; see Coal tar pitch volatiles
Benzoyl peroxide94–36–0—5—
Benzyl chloride100–44–715—
Beryllium and beryllium compounds (as Be); see 1926.1124 (q)7440–41–7—0.002—
Biphenyl; see Diphenyl
Bisphenol A; see Diglycidyl ether
Boron oxide1303–86–2
Total dust—15—
Boron tribromide10294–33–4110—
Boron trifluoride7637–07–2(C)1(C)3—
Bromine7726–95–60.10.7—
Bromine pentafluoride7789–30–20.10.7—
Bromoform75–25–20.55X
Butadiene (1,3-Butadiene); see 29 CFR 1910.1051; 29 CFR 1910.19(l)106–99–0STEL 1 ppm/5 ppm—
Butanethiol; see Butyl mercaptan
2-Butanone (Methyl ethyl ketone)78–93–3200590—
2-Butoxyethanol111–76–250240X
n-Butyl-acetate123–86–4150710—
sec-Butyl acetate105–46–4200950—
tert-Butyl acetate540–88–5200950—
n-Butyl alcohol71–36–3100300—
sec-Butyl alcohol78–92–2150450—
tert-Butyl alcohol75–65–0100300—
Butylamine109–73–9(C)5(C)15X
tert-Butyl chromate (as CrO3); see 1926.1126 n1189–85–1
n-Butyl glycidyl ether (BGE)2426–08–650270—
Butyl mercaptan109–79–50.51.5—
p-tert-Butyltoluene98–51–11060—
Cadmium (as Cd); see 1926.11277440–43–9
Calcium carbonate1317–65–3
Total dust——
Respirable fraction——
Calcium oxide1305–78–8—5—
Calcium sulfate7778–18–9
Total dust—15—
Respirable fraction—5—
Camphor, synthetic76–22–2—2—
Carbaryl (Sevin)63–25–2—5—
Carbon black1333–86–4—3.5—
Carbon dioxide124–38–950009000—
Carbon disulfide75–15–02060X
Carbon monoxide630–08–05055—
Carbon tetrachloride56–23–51065X
Cellulose9004–34–6
Total dust——
Respirable fraction——
Chlordane57–74–9—0.5X
Chlorinated camphene8001–35–2—0.5X
Chlorinated diphenyl oxide55720–99–5—0.5—
Chlorine7782–50–513—
Chlorine dioxide10049–04–40.10.3
Chlorine trifluoride7790–91–2(C)0.1(C)0.4—
Chloroacetaldehyde107–20–0(C)1(C)3—
a-Chloroacetophenone (Phenacyl chloride)532–27–40.050.3—
Chlorobenzene108–90–775350—
o-Chlorobenzylidene malononitrile2698–41–10.050.4—
Chlorobromomethane74–97–52001050—
2-Chloro-1,3-butadiene; see beta-Chloroprene
Chlorodiphenyl (42% Chlorine) (PCB)53469–21–9—1X
Chlorodiphenyl (54% Chlorine) (PCB)11097–69–1—0.5X
1-Chloro,2,3-epoxypropane; see Epichlorohydrin
2-Chloroethanol; see Ethylene chlorohydrin
Chloroethylene; see Vinyl chloride
Chloroform (Trichloromethane)67–66–3(C)50(C)240—
bis(Chloromethyl) ether; see § 1926.1108542–88–1
Chloromethyl methyl ether; see § 1926.1106107–30–2
1-Chloro-1-nitropropane600–25–920100—
Chloropicrin76–06–20.10.7—
beta-Chloroprene126–99–82590X
Chromium (II) compounds
(as Cr)7440–47–3—0.5—
Chromium (III) compounds
(as Cr)7440–47–3—0.5—
Chromium (VI) compounds; See 1926.1126 o
Chromium metal and insol. salts (as Cr)7440–47–3—1—
Chrysene; see Coal tar pitch volatiles
Coal tar pitch volatiles (benzene soluble fraction), anthracene, BaP, phenanthrene, acridine, chrysene, pyrene65996–93–2—0.2—
Cobalt metal, dust, and fume (as Co)7440–48–4—0.1—
Copper7440–50–8
Fume (as Cu)—0.1—
Dusts and mists (as Cu)—1—
Corundum; see Emery
Cotton dust (raw)—1
Crag herbicide (Sesone)136–78–7
Total dust——
Respirable fraction——
Cresol, all isomers1319–77–3522X
Crotonaldehyde123–73–9;26
4170–30–3
Cumene98–82–850245X
Cyanides (as CN)Varies with Compound—5X
Cyanogen460–19–510——
Cyclohexane110–82–73001050—
Cyclohexanol108–93–050200—
Cyclohexanone108–94–150200—
Cyclohexene110–83–83001015—
Cyclonite121–82–4—1.5X
Cyclopentadiene542–92–775200—
DDT, see Dichlorodiphenyltrichloroethane
DDVP, see Dichlorvos
2,4-D (Dichlorophenoxyacetic acid)94–75–7—10—
Decaborane17702–41–90.050.3X
Demeton (Systox)8065–48–3—0.1X
Diacetone alcohol (4-Hydroxy-4-methyl-2-pentanone)123–42–250240—
1,2-Diaminoethane; see Ethylenediamine
Diazomethane334–88–30.20.4—
Diborane19287–45–70.10.1—
1,2-Dibromo-3-chloropropane (DBCP); see § 1926.114496–12–8—
1,2-Dibromoethane; see Ethylene dibromide
Dibutyl phosphate107–66–415—
Dibutyl phthalate84–74–2—5—
Dichloroacetylene7572–29–4(C)0.1(C)0.4—
o-Dichlorobenzene95–50–1(C)50(C)300—
p-Dichlorobenzene106–46–775450—
3,3′-Dichlorobenzidine; see § 1926.110791–94–1
Dichlorodifluoromethane75–71–810004950—
1,3-Dichloro-5,5-dimethyl hydantoin118–52–5—0.2—
Dichlorodiphenyltrichloroethane (DDT)50–29–3—1X
1,1-Dichloroethane75–34–3100400—
1,2-Dichloroethane; see Ethylene dichloride
1,2-Dichloroethylene540–59–0200790—
Dichloroethyl ether111–44–4(C)15(C)90X
Dichloromethane; see Methylene chloride
Dichloromonofluoromethane75–43–410004200—
1,1-Dichloro-1-nitroethane594–72–9(C)10(C)60—
1,2-Dichloropropane; see Propylene dichloride
Dichlorotetrafluoroethane76–14–210007000—
Dichlorvos (DDVP)62–73–7—1X
Dieldrin60–57–1—0.25X
Diethylamine109–89–72575—
2-Diethylaminoethanol100–37–81050X
Diethylene triamine111–40–0(C)10(C)42X
Diethyl ether; see Ethyl ether
Difluorodibromomethane75–61–6100860—
Diglycidyl ether (DGE)2238–07–5(C)0.5(C)2.8—
Dihydroxybenzene; see Hydroquinone
Diisobutyl ketone108–83–850290—
Diisopropylamine108–18–9520X
4-Dimethylaminoazobenzene; see § 1926.111560–11–7
Dimethoxymethane; see Methylal
Dimethyl acetamide127–19–51035X
Dimethylamine124–40–31018—
Dimethylaminobenzene; see Xylidine
Dimethylaniline (N,N-Dimethylaniline)121–69–7525X
Dimethylbenzene; see Xylene
Dimethyl-1,2-dibromo- 2,2-dichloroethyl phosphate300–76–5—3—
Dimethylformamide68–12–21030X
2,6-Dimethyl-4-heptanone; see Diisobutyl ketone
1,1-Dimethylhydrazine57–14–70.51X
Dimethylphthalate131–11–3—5—
Dimethyl sulfate77–78–315X
Dinitrobenzene (all isomers)1X
(ortho)528–29–0
(meta)99–65–0
(para)100–25–4
Dinitro-o-cresol534–52–1—0.2X
Dinitrotoluene25321–14–6—1.5X
Dioxane (Diethylene dioxide)123–91–1100360X
Diphenyl (Biphenyl)92–52–40.21—
Diphenylamine122–39–4—10—
Diphenylmethane diisocyanate; see Methylene bisphenyl isocyanate
Dipropylene glycol methyl ether34590–94–8100600X
Di-sec octyl phthalate (Di-(2-ethylhexyl) phthalate)117–81–7—5—
Emery12415–34–8
Total dust——
Respirable fraction——
Endosulfan115–29–7—0.1X
Endrin72–20–8—0.1X
Epichlorohydrin106–89–8519X
EPN2104–64–5—0.5X
1,2-Epoxypropane; see Propylene oxide
2,3-Epoxy-1-propanol; see Glycidol
Ethane74–84–0E
Ethanethiol; see Ethyl mercaptan
Ethanolamine141–43–536—
2-Ethoxyethanol (Cellosolve)110–80–5200740X
2-Ethoxyethyl acetate (Cellosolve acetate)111–15–9100540X
Ethyl acetate141–78–64001400—
Ethyl acrylate140–88–525100X
Ethyl alcohol (Ethanol)64–17–510001900—
Ethylamine75–04–71018—
Ethyl amyl ketone (5-Methyl-3-heptanone)541–85–525130—
Ethyl benzene100–41–4100435—
Ethyl bromide74–96–4200890—
Ethyl butyl ketone (3-Heptanone)106–35–450230—
Ethyl chloride75–00–310002600—
Ethyl ether60–29–74001200—
Ethyl formate109–94–4100300—
Ethyl mercaptan75–08–10.51—
Ethyl silicate78–10–4100850—
Ethylene74–85–1E
Ethylene chlorohydrin107–07–3516X
Ethylenediamine107–15–31025—
Ethylene dibromide106–93–4(C)25(C)190X
Ethylene dichloride (1,2-Dichloroethane)107–06–250200—
Ethylene glycol dinitrate628–96–6(C)0.2(C)1X
Ethylene glycol methyl acetate; see Methyl cellosolve acetate
Ethyleneimine; see § 1926.1112151–56–4
Ethylene oxide; see § 1926.114775–21–8
Ethylidene chloride; see 1,1-Dichloroethane
N-Ethylmorpholine100–74–32094X
Ferbam14484–64–1
Total dust—15—
Ferrovanadium dust12604–58–9—1—
Fibrous Glass
Total dust—
Respirable fraction——
Fluorides (as F)Varies with compound—2.5—
Fluorine7782–41–40.10.2—
Fluorotrichloromethane (Trichlorofluoromethane)75–69–410005600—
Formaldehyde; see § 1926.114850–00–0
Formic acid64–18–659—
Furfural98–01–1520X
Furfuryl alcohol98–00–050200—
Gasoline8006–61–9A 3—
Glycerin (mist)56–81–5
Total dust——
Respirable fraction——
Glycidol556–52–550150—
Glycol monoethyl ether; see 2-Ethoxyethanol
Graphite, natural, respirable dust7782–42–5( 2)( 2)( 2)
Graphite, synthetic
Total dust——
Respirable fraction——
Guthion; see Azinphos methyl
Gypsum13397–24–5
Total dust——
Respirable fraction——
Hafnium7440–58–6—0.5—
Helium7440–59–7E
Heptachlor76–44–8—0.5X
Heptane (n-Heptane)142–82–55002000—
Hexachloroethane67–72–1110X
Hexachloronaphthalene1335–87–1—0.2X
n-Hexane110–54–35001800—
2-Hexanone (Methyl n-butyl ketone)591–78–6100410—
Hexone (Methyl isobutyl ketone)108–10–1100410—
sec-Hexyl acetate108–84–950300—
Hydrazine302–01–211.3X
Hydrogen1333–74–0E
Hydrogen bromide10035–10–6310—
Hydrogen chloride7647–01–0(C)5(C)7—
Hydrogen cyanide74–90–81011X
Hydrogen fluoride (as F)7664–39–332—
Hydrogen peroxide7722–84–111.4—
Hydrogen selenide (as Se)7783–07–50.05.02—
Hydrogen sulfide7783–06–41015—
Hydroquinone123–31–9—2—
Indene95–13–61045—
Indium and compounds (as In)7440–74–6—0.1—
Iodine7553–56–2(C)0.1(C)1—
Iron oxide fume1309–37–1—10—
Iron salts (soluble) (as Fe)Varies with compound—1—
Isoamyl acetate123–92–2100525—
Isoamyl alcohol (primary and secondary)123–51–3100360—
Isobutyl acetate110–19–0150700—
Isobutyl alcohol78–83–1100300—
Isophorone78–59–125140—
Isopropyl acetate108–21–4250950—
Isopropyl alcohol67–63–0400980—
Isopropylamine75–31–0512—
Isopropyl ether108–20–35002100—
Isopropyl glycidyl ether (IGE)4016–14–250240—
Kaolin1332–58–7
Total dust——
Respirable fraction——
Ketene463–51–40.50.9—
Lead, inorganic (as Pb); see 1926.627439–92–1
Limestone1317–65–3
Total dust——
Respirable fraction——
Lindane58–89–9—0.5X
Lithium hydride7580–67–8—0.025—
L.P.G. (Liquefied petroleum gas)68476–85–710001800
Magnesite546–93–0
Total dust——
Respirable fraction——
Magnesium oxide fume1309–48–4
Total particulate15——
Malathion121–75–5
Total dust—15X
Maleic anhydride108–31–60.25
Manganese compounds (as Mn)7439–96–5—(C)5—
Manganese fume (as Mn)7439–96–5—(C)5—
Marble1317–65–3
Total dust——
Respirable fraction——
Mercury (aryl and inorganic)(as Hg)7439–97–60.1X
Mercury (organo) alkyl compounds (as Hg)7439–97–6—0.01X
Mercury (vapor) (as Hg)7439–97–6—0.1X
Mesityl oxide141–79–725100—
Methane74–82–8E
Methanethiol; see Methyl mercaptan
Methoxychlor72–43–5
Total dust—15—
2-Methoxyethanol (Methyl cellosolve)109–86–42580X
2-Methoxyethyl acetate (Methyl cellosolve acetate)110–49–625120X
Methyl acetate79–20–9200610—
Methyl acetylene (Propyne)74–99–710001650—
Methyl acetylene-propadiene mixture (MAPP)10001800—
Methyl acrylate96–33–31035X
Methylal (Dimethoxy-methane)109–87–510003100—
Methyl alcohol67–56–1200260—
Methylamine74–89–51012—
Methyl amyl alcohol; see Methyl isobutyl carbinol
Methyl n-amyl ketone110–43–0100465—
Methyl bromide74–83–9(C)20(C)80X
Methyl butyl ketone; see 2-Hexanone
Methyl cellosolve; see 2-Methoxyethanol
Methyl cellosolve acetate; see 2-Methoxyethyl acetate
Methylene chloride; see § 1910.1052
Methyl chloroform (1,1,1-Trichloroethane)71–55–63501900—
Methylcyclohexane108–87–25002000—
Methylcyclohexanol25639–42–3100470—
o-Methylcyclohexanone583–60–8100460X
Methylene chloride75–09–25001740—
Methylenedianiline (MDA)101–77–9
Methyl ethyl ketone (MEK); see 2-Butanone
Methyl formate107–31–3100250—
Methyl hydrazine (Monomethyl hydrazine)60–34–4(C)0.2(C)0.35X
Methyl iodide74–88–4528X
Methyl isoamyl ketone110–12–3100475—
Methyl isobutyl carbinol108–11–225100X
Methyl isobutyl ketone; see Hexone
Methyl isocyanate624–83–90.020.05X
Methyl mercaptan74–93–10.51—
Methyl methacrylate80–62–6100410—
Methyl propyl ketone; see 2-Pentanone
Methyl silicate681–84–5(C)5(C)30—
alpha-Methyl styrene98–83–9(C)100(C)480—
Methylene bisphenyl isocyanate (MDI)101–68–8(C)0.02(C)0.2—
Mica; see Silicates
Molybdenum (as Mo)7439–98–7
Soluble compounds—5—
Insoluble compounds
Total dust—15—
Monomethyl aniline100–61–829X
Monomethyl hydrazine; see Methyl hydrazine
Morpholine110–91–82070X
Naphtha (Coal tar)8030–30–6100400—
Naphthalene91–20–31050—
alpha-Naphthylamine; see § 1926.1104134–32–7
beta-Naphthylamine; see § 1926.110991–59–8—
Neon7440–01–9E
Nickel carbonyl (as Ni)13463–39–30.0010.007—
Nickel, metal and insoluble compounds (as Ni)7440–02–0—1—
Nickel, soluble compounds (as Ni)7440–02–0—1—
Nicotine54–11–5—0.5X
Nitric acid7697–37–225—
Nitric oxide10102–43–92530—
p-Nitroaniline100–01–616X
Nitrobenzene98–95–315X
p-Nitrochlorobenzene100–00–5—1X
4-Nitrodiphenyl; see § 1926.110392–93–3
Nitroethane79–24–3100310—
Nitrogen7727–37–9E
Nitrogen dioxide10102–44–0(C)5(C)9—
Nitrogen trifluoride7783–54–21029—
Nitroglycerin55–63–0(C)0.2(C)2X
Nitromethane75–52–5100250—
1-Nitropropane108–03–22590—
2-Nitropropane79–46–92590—
N-Nitrosodimethylamine; see § 1926.111662–79–9—
Nitrotoluene (all isomers)530X
o-isomer88–72–2;
m-isomer99–08–1;
p-isomer99–99–0
Nitrotrichloromethane; see Chloropicrin
Nitrous oxide10024–97–2E
Octachloronaphthalene2234–13–1—0.1X
Octane111–65–94001900—
Oil mist, mineral8012–95–1—5—
Osmium tetroxide (as Os)20816–12–0—0.002—
Oxalic acid144–62–7—1—
Oxygen difluoride7783–41–70.050.1—
Ozone10028–15–60.10.2—
Paraquat, respirable dust4685–14–7;—0.5X
1910–42–5;
2074–50–2
Parathion56–38–2—0.1X
Particulates not otherwise regulated
Total dust organic and inorganic—15—
PCB; see Chlorodiphenyl (42% and 54% chlorine)
Pentaborane19624–22–70.0050.01—
Pentachloronaphthalene1321–64–8—0.5X
Pentachlorophenol87–86–5—0.5X
Pentaerythritol115–77–5
Total dust——
Respirable fraction——
Pentane109–66–05001500—
2-Pentanone (Methyl propyl ketone)107–87–9200700—
Perchloroethylene (Tetrachloroethylene)127–18–4100670—
Perchloromethyl mercaptan594–42–30.10.8—
Perchloryl fluoride7616–94–6313.5—
Petroleum distillates (Naphtha)(Rubber Solvent)A 3—
Phenol108–95–2519X
p-Phenylene diamine106–50–3—0.1X
Phenyl ether, vapor101–84–817—
Phenyl ether-biphenyl mixture, vapor17—
Phenylethylene; see Styrene
Phenyl glycidyl ether (PGE)122–60–11060—
Phenylhydrazine100–63–0522X
Phosdrin (Mevinphos)7786–34–7—0.1X
Phosgene (Carbonyl chloride)75–44–50.10.4—
Phosphine7803–51–20.30.4—
Phosphoric acid7664–38–2—1—
Phosphorus (yellow)7723–14–0—0.1—
Phosphorus pentachloride10026–13–8—1—
Phosphorus pentasulfide1314–80–3—1—
Phosphorus trichloride7719–12–20.53—
Phthalic anhydride85–44–9212—
Picric acid88–89–1—0.1X
Pindone (2-Pivalyl-1,3-indandione)83–26–1—0.1—
Plaster of Paris26499–65–0
Total dust——
Respirable fraction——
Platinum (as Pt)7440–06–4
Metal———
Soluble salts—0.002—
Polytetrafluoroethylene decomposition productsA 2
Portland cement65997–15–1
Total dust—15—
Respirable fraction5—
Propane74–98–6E
Propargyl alcohol107–19–71—X
beta-Propriolactone; see § 1926.111357–57–8
n-Propyl acetate109–60–4200840—
n-Propyl alcohol71–23–8200500—
n-Propyl nitrate627–13–425110—
Propylene dichloride78–87–575350—
Propylene imine75–55–825X
Propylene oxide75–56–9100240—
Propyne; see Methyl acetylene
Pyrethrum8003–34–7—5—
Pyridine110–86–1515—
Quinone106–51–40.10.4—
RDX; see Cyclonite
Rhodium (as Rh), metal fume and insoluble compounds7440–16–6—0.1—
Rhodium (as Rh), soluble compounds7440–16–6—0.001—
Ronnel299–84–3—10—
Rotenone83–79–4—5—
Rouge
Total dust——
Respirable fraction——
Selenium compounds (as Se)7782–49–2—0.2—
Selenium hexafluoride (as Se)7783–79–10.050.4—
Silica, amorphous, precipitated and gel112926–00–8( 2)( 2)( 2)
Silica, amorphous, diatomaceous earth, containing less than 1% crystalline silica61790–53–2( 2)( 2)( 2)
Silica, crystalline, respirable dust
Cristobalite; see 1926.115314464–46–1
Quartz; see 1926.1153 514808–60–7
Tripoli (as quartz); see 1926.1153 51317–95–9
Tridymite; see 1926.115315468–32–3
Silica, fused, respirable dust60676–86–0( 2)( 2)( 2)
Silicates (less than 1% crystalline silica)
Mica (respirable dust)12001–26–2( 2)( 2)( 2)
Soapstone, total dust( 2)( 2)( 2)
Soapstone, respirable dust( 2)( 2)( 2)
Talc (containing asbestos); use asbestos limit; see § 1926.1101
Talc (containing no asbestos), respirable dust 14807–96–6( 2)( 2)( 2)
Tremolite, asbestiform; see § 1926.1101
Silicon carbide409–21–2
Total dust——
Respirable fraction——
Silver, metal and soluble compounds (as Ag)7440–22–4—0.01—
Soapstone; see Silicates
Sodium fluoroacetate62–74–8—0.05X
Sodium hydroxide1310–73–2—2—
Starch9005–25–8
Total dust——
Respirable fraction——
Stibine7803–52–30.10.5—
Stoddard solvent8052–41–32001150—
Strychnine57–24–9—0.15—
Styrene100–42–5(C)100(C)420—
Sucrose57–50–1
Total dust——
Respirable fraction——
Sulfur dioxide7446–09–5513—
Sulfur hexafluoride2551–62–410006000—
Sulfuric acid7664–93–9—1—
Sulfur monochloride10025–67–916—
Sulfur pentafluoride5714–22–70.0250.25—
Sulfuryl fluoride2699–79–8520—
Systox, see Demeton
2,4,5-T (2,4,5-trichlorophenoxyacetic acid)93–76–5—10—
Talc; see Silicates—
Tantalum, metal and oxide dust7440–25–7—5—
TEDP (Sulfotep)3689–24–5—0.2X
Teflon decomposition productsA2
Tellurium and compounds (as Te)13494–80–9—0.1—
Tellurium hexafluoride (as Te)7783–80–40.020.2—
Temephos3383–96–8
Total dust——
Respirable fraction——
TEPP (Tetraethyl pyrophosphate)107–49–3—0.05X
Terphenyls26140–60–3(C)1(C)9—
1,1,1,2-Tetrachloro-2,2-difluoroethane76–11–95004170—
1,1,2,2-Tetrachloro-1,2-difluoroethane76–12–05004170—
1,1,2,2-Tetrachloroethane79–34–5535X
Tetrachloroethylene; see Perchloroethylene
Tetrachloromethane; see Carbon tetrachloride
Tetrachloronaphthalene1335–88–2—2X
Tetraethyl lead (as Pb)78–00–2—0.1X
Tetrahydrofuran109–99–9200590—
Tetramethyl lead, (as Pb)75–74–1—0.15X
Tetramethyl succinonitrile3333–52–60.53X
Tetranitromethane509–14–818—
Tetryl (2,4,6-Trinitrophenylmethylnitramine)479–45–8—1.5X
Thallium, soluble compounds (as Tl)7440–28–0—0.1X
Thiram137–26–8—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——
Respirable fraction——
Titanium dioxide13463–67–7
Total dust——
Toluene108–88–3200750—
Toluene-2,4-diisocyanate (TDI)584–84–9(C)0.02(C)0.14—
o-Toluidine95–53–4522X
Toxaphene; see Chlorinated camphene
Tremolite; see Silicates
Tributyl phosphate126–73–8—5—
1,1,1-Trichloroethane; see Methyl chloroform
1,1,2-Trichloroethane79–00–51045X
Trichloroethylene79–01–6100535—
Trichloromethane; see Chloroform
Trichloronaphthalene1321–65–9—5X
1,2,3-Trichloropropane96–18–450300—
1,1,2-Trichloro-1,2,2-trifluoroethane76–13–110007600—
Triethylamine121–44–825100—
Trifluorobromomethane75–63–810006100—
Trimethyl benzene25551–13–725120—
2,4,6-Trinitrophenol; see Picric acid
2,4,6-Trinitrophenylmethylnitramine; see Tetryl
2,4,6-Trinitrotoluene (TNT)118–96–7—1.5X
Triorthocresyl phosphate78–30–8—0.1—
Triphenyl phosphate115–86–6—3—
Tungsten (as W)7440–33–7
Insoluble compounds—5—
Soluble compounds—1—
Turpentine8006–64–2100560—
Uranium (as U)7440–61–1
Soluble compounds—0.2—
Insoluble compounds—0.2—
Vanadium1314–62–1
Respirable dust (as V2 O5)—(C)0.5—
Fume (as V2 O5)—(C)0.1—
Vegetable oil mist
Total dust——
Respirable fraction——
Vinyl benzene; see Styrene
Vinyl chloride; see § 1926.111775–01–4
Vinyl cyanide; see Acrylonitrile
Vinyl toluene25013–15–4100480—
Warfarin81–81–2—0.1—
Xylenes (o-, m-, p-isomers)1330–20–7100435—
Xylidine1300–73–8525X
Yttrium7440–65–5—1—
Zinc chloride fume7646–85–7—1—
Zinc oxide fume1314–13–2—5—
Zinc oxide1314–13–2
Total dust—15—
Respirable fraction—5—
Zirconium compounds (as Zr)7440–67–7—5
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