TABLE AC-1 (printable .pdf file 128K)
PERMISSIBLE EXPOSURE LIMITS FOR CHEMICAL CONTAMINANTS

Chemical
Abstracts
Registry
Number (a) 		Skin(b) Name(c) PEL (d)
   STEL (o)
ppm(e) mg/M3(f) Ceiling(g) ppm(e) mg/M3(f)
75070   Acetaldehyde 25 45 C    
64197   Acetic acid 10 25 40 ppm 15 37
108247   Acetic Anhydride 5 20 C    
67641   Acetone 500 1200 3000 ppm 750 1780
75868   Acetone cyanohydrin as CN 4.7 5 C    
75058 S Acetonitrile 40 70   60 105
98862   Acetophenone 10 49      
53963 S 2-Acetylaminofluorene; N-fluoren-2-yl acetamide;          
    see Section 5209          
74862   Acetylene (h)        
540590   Acetylene dichloride; see 1,2-Dichloroethylene          
79276   Acetylene tetrabromide:1,1,2,2-tetrabromoethane 1 14      
79345   Acetylene tetrachloride; see 1,1,2,2-          
    Tetrachloroethane          
50782   Acetylsalicylic acid (Aspirin)   5      
107028 S Acrolein 0.1 0.25 C    
79061 S Acrylamide -- 0.03      
79107 S Acrylic acid 2 5.9      
107131 S Acrylonitrile; see Section 5213 2 4.5      
124049   Adipic acid -- 5      
111693 S Adiponitrile 2 8.8      
309002 S Aldrin; 1,2,3,4,10,10-hexachloro-1,4,4a,5,8,8a-          
    hexahydro-endo-1,2-exo-5,8-          
    dimethanonaphthalene -- 0.25      
107186 S Allyl alcohol 0.5 1.25   4 10
107051   Allyl chloride 1 3   2 6
106923 S Allyl glycidyl ether; AGE 5 22   10 44
2179591   Allyl propyl disulfide 2 12   3 18
1344281   Alumina; see Particulates not otherwise regulated          
    Aluminum, alkyls (not otherwise classified) -- 2      
    Aluminum soluble salts -- 2      
    Aluminum metal and oxide --        
    Total dust -- 10      
    Respirable fraction(n) -- 5(n)      
    Aluminum pyro powders -- 5      
    Aluminum welding fumes -- 5      
300925   Aluminum distearate -- 10      
7047849   Aluminum stearate -- 10      
637127   Aluminum tristearate -- 10      
1300738   Aminodimethylbenzene; see Xylidene          
92671 S 4-Aminodiphenyl; see Section 5209          
141435   2-Aminoethanol; see Ethanolamine          
91598   2-Aminonapthalene; see beta-Naphthylamine,          
    Section 5209          
504290   2-Aminopyridine 0.5 2      
61825   Amitrole -- 0.2      
7664417   Ammonia 25 18   35 27
3825261 S Ammonium perfluorooctanoate -- 00.1      
12125029   Ammonium chloride fume -- 10   -- 20
1002897   Ammonium stearate -- 10      
7773060   Ammonium sulfamate --        
    Total dust -- 10      
    Respirable fraction(n) -- 5      
620111   3-Amyl acetate; See Pentyl acetate          
628637   n-Amyl acetate; See Pentyl acetate          
626380   sec-Amyl acetate (all isomers and mixtures); See Pentyl acetate          
625161   tert-Amyl acetate; See Pentyl acetate        
62533 S Aniline 2 7.6      
29191524 S Anisidine (ortho and para isomers) 0.1 0.5      
    Antimony and compounds, as Sb -- 0.5      
86884   ANTU; 1-(1-naphthyl)-2-thiourea; Bantu; Rattrack -- 0.3      
7440371   Argon (h)        
7440382   Arsenic and inorganic arsenic compounds; see also   0.01      
    Section 5214          
    Arsenic, organic compounds, as As -- 0.2      
7784421   Arsine; AsH3 0.05 0.2      
1332-21-4   Asbestos (including actinolite, amosite          
    anthophyllite, chrysotile, crocidolite, and tremolite);          
    see Section 5208          
8052424   Asphalt (petroleum) fumes -- 5      
1912249   Atrazine -- 5      
86500 S Azinphos methyl; o,o-dimethyl S-(4-oxo-1,2,3- -- 0.2      
    benzotriazin-3(4H)-ylmethyl) phosphorodithioate          
3333526 S 2,2'-Azobisisobutyronitrile decomposition product,          
    see Tetramethyl succinonitrile          
7440393   Barium, soluble compounds, as Ba -- 0.5      
7727437   Barium sulfate; see Particulates not otherwise regulated          
17804352   Benomyl          
    Total dust -- 10      
    Respirable fraction(n) -- 5      
71432 S Benzene; see also Section 5218 1     5 --
92875 S Benzidine; 4,4'-diaminobiphenyl, see Section 5209          
71432   Benzol; see Benzene          
106514   D-Benzoquinone; see Quinone          
98884   Benzoyl chloride 0.2 1.1 C    
94360   Benzoyl peroxide; dibenzoyl peroxide -- 5      
140114   Benzyl acetate 10 61      
100447   benzyl chloride; alpha-chlorotoluene 1 5      
7440417   Beryllium, and beryllium compounds as Be -- 0.0002 0.025mg/M3 --  
92524   Biphenyl; diphenyl; phenylbenzene 0.2 1.5      
542881   Bis(chloromethyl) ether, see bis-Chloromethyl ether,          
    Section 5209          
3033623 S Bis (Dimethylaminoethyl) ether (DMAEE) 0.05 0.328   0.15 0.983
1304821   Bismuth telluride          
    Total dust -- 10      
    Respirable fraction(n) -- 5      
    Bismuth telluride (selenium-doped) -- 5      
    Borates, tetra, sodium salts          
    Anhydrous -- 5      
    Decahydrate -- 5      
    Pentahydrate -- 5      
1303862   Boron oxide -- 10      
10294334   Boron tribromide 1 10 C    
7637072   Boron trifluoride 1 3 C    
314409   Bromacil 1 10      
7726956   Bromine 0.1 0.7 C    
7789302   Bromine pentafluoride 0.1 0.7      
74975   Bromochloromethane; see Chlorobromethane          
74964   Bromoethane; see Ethyl bromide          
75252 S Bromoform; tribromomethane 0.5 5      
74839   Bromomethane, see Methyl bromide          
75638   Bromotrifluoromethane; see Trifluorobromomethane          
106990   1,3-Butadiene (see also section 5201) 1 2.2   5 11
106978   Butane 800 1,900      
109795   1-Butanethiol; see Butyl mercaptan          
71363   1-Butanol; see n-Butyl alcohol          
78933   2-Butanone; see Methyl ethyl ketone          
111762 S 2-Butoxyethanol (EGBE) 20 97      
123864   n-Butyl acetate 150 710   200 950
105464   sec-Butyl acetate 200 950      
540885   tert-Butyl acetate 200 950      
141322   Butyl acrylate 2 11      
71363 S n-Butyl alcohol; 1-butanol 50 150 C    
78922   sec-Butyl alcohol 100 305      
75650   tert-Butyl alcohol 100 300   150 450
109739 S Butylamine 5 15 C    
1189851 S tert-Butyl chromate; di-tert-butyl          
    chromate, as CrO3 -- 0.1 C    
                     as Cr   0.005      
      (see also Sections 1532.2, 5206 & 8359)          
2426086   n-Butyl glycidyl ether; BGE; 25 135      
    1-butoxy-2,3-epoxypropane          
138227   n-Butyl lactate 5 25      
109795   n-Butyl mercaptan 0.5 1.5      
89725 S o-sec-Butylphenol 5 30      
98511   p-tert-Butyltoluene 1 6.1   20 120
7440439   Cadmium metal dust, as Cd          
    (see also Sections 1532 & 5207) -- 0.005      
    Cadmium, soluble salts, as Cd          
    (see also Sections 1532 & 5207) -- 0.005      
1306190   Cadmium oxide fume, as Cd          
    (see also Sections 1532 & 5207 ) -- 0.005      
7778441   Calcium arsenate; see Arsenic,inorganic (see          
    also Section 5214)          
471341   Calcium carbonate; see Particulates not otherwise regulated   --      
156627   Calcium cyanamide -- 0.5      
1305620   Calcium hydroxide -- 5      
1305788   Calcium oxide -- 2      
    Calcium silicate; see Particulates not otherwise regulated          
1344952   Calcium silicate (synthetic): see Particulates not otherwise regulated          
1592230   Calcium stearate -- 10      
7778189   Calcium sulfate; see Particulates not otherwise regulated          
76222   Camphor (synthetic) -- 2      
105602   Caprolactam dust -- 1   -- 3
105602   Caprolactam vapor 5 20   10 40
2425061 S Captafol -- 0.1      
133062   Captan -- 5      
63252   Carbaryl; 1-naphthyl N-methylcarbamate -- 5      
1563662   Carbofuran -- 0.1      
1333864   Carbon black -- 3.5      
124389   Carbon dioxide 5,000 9,000   30,000 54,000
75150 S Carbon disulfide 4 12 30 ppm 12 36
630080   Carbon monoxide 25 29 200 ppm    
558134   Carbon tetrabromide 0.1 1.4   0.3 4
56235 S Carbon tetrachloride 2 12.6 200 ppm 10 63
75445   Carbonyl chloride; see Phosgene          
353504   Carbonyl fluoride 2 5   5 15
120809 S Catechol; pyrocatechol 5 20      
9004346   Cellulose (paper fiber); see Particulates not otherwise regulated          
21351791   Cesium hydroxide   2      
57749 S Chlordane; 1,2,4,5,6,7,8,8-octachloro-3a,4,7,7a- -- 0.5      
    tetrahydro-4,7-methanoindane          
8001352 S Chlorinated camphene; toxaphene -- 0.5   -- 1
    Chlorinated diphenyl oxide -- 0.5      
7782505   Chlorine 0.5 1.5   1 3
10049044   Chlorine dioxide 0.1 0.3   0.3 0.9
7790912   Chlorine trifluoride 0.1 0.4 C    
107200   Chloroacetaldehyde 1 3 C    
78955 S Chloroacetone 1 3.8 C    
532274   alpha-Chloroacetophenone;phenacyl chloride 0.05 0.3      
79049 S Chloroacetyl chloride 0.05 0.2   0.15 0.69
108907   Chlorobenzene; monochlorobenzene 10 46      
2698411 S o-Chlorobenzylidene malononitrile; OCBM 0.05 0.4 C    
74975   Chlorobromomethane; bromochloromethane 200 1,050      
126998 S 2-Chloro-1,3-butadiene; see Chloroprene          
75456   Chlorodifluoromethane; Fluorocarbon 22 1,000 3,500      
53469219 S Chlorodiphenyl (42% chlorine) -- 1      
11097691 S Chlorodiphenyl (54% chlorine) -- 0.5      
106898   1-Chloro-2,3-epoxypropane; see Epichlorohydrin          
75003   Chloroethane; see Ethyl chloride          
107073   2-Chloroethanol; see Ethylene chlorohydrin          
75014   Chloroethylene, see Vinyl chloride, Section 5210          
67663   Chloroform; trichloromethane 2 9.78      
74873   Chloromethane, see Methyl chloride          
107302   Chloromethyl methyl ether; see Methyl          
    chloromethyl ether, Section 5209          
542881   bis-Chloromethyl ether, see also Section 5209 0.001 0.005      
100005   1-Chloro-4-nitrobenzene; see          
    p-Nitrochlorobenzene          
600259   1-Chloro-1-nitropropane 2 10      
76153   Chloropentafluoroethane 1,000 6,320      
76062   Chloropicrin; trichloronitromethane 0.1 0.7      
126998 S Chloroprene; 2-chloro-1,3-butadiene 10 36      
598787 S 2-Chloropropionic acid 0.1 0.44      
2039874   o-Chlorostyrene 50 285   75 428
95498 S o-Chlorotoluene 50 250      
1929824   2-Chloro-6-(trichloromethyl)pyridine; see Nitrapyrin          
2921882 S Chlorpyrifos -- 0.2      
    Chromite ore processing (chromate), as Cr -- 0.005      
  (see also Sections 1532.2, 5206 & 8359)          
7440473   Chromium metal -- 0.5      
    Chromium (II) compounds, as Cr -- 0.5      
    Chromium (III) compounds, as Cr -- 0.5      
    Chromium (VI) compounds, as Cr -- 0.005 0.1mg/M3    
  (see also Sections 1532.2, 5206 & 8359)          
14977618   Chromyl chloride 0.025 0.15      
2971906   Clopidol --        
    Total dust -- 10      
      Respirable fraction -- 5      
    Coal (Bituminous) dust          
    <5% quartz, respirable fraction(n) -- 2      
    >5% quartz, respirable fraction(n) -- 0.1      
    Coal tar pitch volatiles(i) -- 0.2      
7440484   Cobalt, metal fume and dust, as Co -- 0.020      
    Cobalt carbonyl, as Co -- 0.1      
16842038   Cobalt hydrocarbonyl, as Co -- 0.1      
    Coke oven emissions, see Section 5211   0.15      
7440508   Copper metal fume, as Cu -- 0.1      
    Copper salts, dusts and mists, as Cu -- 1      
    Corundum, see Particulates not otherwise regulated          
    Cotton dust, see also Section 5190 -- 1(j)      
1319773 S Cresol (all isomers) 5 22      
123739 S Crotonaldehyde; beta-methylacrolein     0.3    
4170303              
299865   Crufomate -- 5      
98828 S Cumene; isopropylbenzene 50 245      
420042   Cyanamide -- 2      
  S Cyanide, as CN -- 5      
460195   Cyanogen 10 20      
506774   Cyanogen chloride 0.3 0.6 C    
110827   Cyclohexane 300 1,050      
108930 S Cyclohexanol 50 200      
108941 S Cyclohexanone 25 100      
110838   Cyclohexene 300 1,015      
108918 S Cyclohexylamine 10 40      
121824 S Cyclonite; RDX; cyclotrimethylenetrinitramine -- 1.5      
542927   Cyclopentadiene 75 200      
287923   Cyclopentane 600 1,720      
13121705   Cyhexatin; tricyclohexyltin hydroxide   5      
94757   2,4-D;2,4-dichlorophenoxyacetic acid -- 10      
50293 S DDT; 1,1,1-trichloro-2,2-bis-          
    (p-chlorophenyl)ethane -- 1      
62737   DDVP, see Dichlorvos          
17702419 S Decaborane 0.05 0.3   0.15 0.9
8065483 S Demeton; a mixture of o,o-diethyl          
    o-2(ethylthio)ethyl phosphorothloate and          
    o,o'-diethyl S-2(ethylthio)ethyl phosphorothioate 0.01 0.1      
123422   Diacetone alcohol; 4-hydroxy-4-methyl-          
    2-pentanone 50 240      
107153   1,2-Diaminoethane; see Ethylenediamine          
    Diatomacous earth; see Silica-amorphous          
333415 S Diazinon; o,o-diethyl o-(2-isopropyl-6- -- 0.1      
    methyl-4-pyrimidinyl) phosphorothioate          
334883   Diazomethane 0.2 0.4      
94360   Dibenzoyl peroxide; see Benzoyl peroxide          
19287457   Diborane 0.1 0.1      
2528361 S Dibutyl phenyl phosphate 0.3 3.5      
96128   1,2-Dibromo-3-chloropropane; DBCP; .001 .01      
    see Section 5212          
75616   Dibromodifluoromethane; see          
    Difluorodibromomethane          
106934 S 1,2-Dibromomethane; see Ethylene dibromide,          
    Section 5219          
102818 S 2-N-Dibutylaminoethanol 2 14      
107664   Dibutyl phosphate 1 5   2 10
84742   Dibutyl phthalate -- 5      
7572294   Dichloroacetylene 0.1 0.4 C    
95501 S o-Dichlorobenzene 25 150 50 ppm    
106467   p-Dichlorobenzene; 1,4-dichlorobenzene 10 60 200 ppm 110 675
91941 S 3,3'-Dichlorobenzidine; 4,4'-diamino-3,3'-          
    dichlorobiphenyl; see Section 5209          
764410 S 1,4 -Dichloro-2-butene 0.005 0.025      
75718   Dichlorodifluoromethane 1000 4950 6200 ppm    
118525   1,3-Dichloro-5,5-dimethyl hydantoin -- 0.2   -- 0.4
75343   1,1-Dichloroethane 100 400      
107062   1,2-Dichloroethane, see Ethylene dichloride          
75354   1,1-Dichloroethylene; see Vinylidene chloride          
540590   1,2-Dichloroethylene; acetylene dichloride 200 790      
111444 S Dichloroethyl ether; bis(2-chloroethyl) ether 5 30   10 60
75434   Dichlorofluoromethane; Fluorocarbon 21 10 42      
75092   Dichloromethane; see Methylene chloride          
594729   1,1-Dichloro-1-nitroethane 2 10      
78875   1,2-Dichloropropane; see Propylene dichloride          
542756 S Dichloropropene 1 5      
75990   2,2-Dichloropropionic acid 1 6      
76142   1,2-Dichlorotetrafluoroethane; Fluorocarbon 114 1,000 7,000      
62737 S Dichlorvos (DDVP); 2,2-dichlorovinyl          
    dimethyl phosphate 0.1 1      
141662 S Dicrotophos -- 0.25      
5124301   Dicyclohexylmethane-4,4'-diisocyanate;          
    see Methylene bis-(4-cyclohexylisocyanate)          
77736   Dicyclopentadiene 5 30      
102545   Dicyclopentadienyl iron --        
    Total dust -- 10      
    Respirable fraction(n) -- 5      
60571 S Dieldrin; 1,2,3,4,10,10-hexachloro-6,7-epoxy-          
    1,4,4a,5,6,7,8,8a-octahydro-1,4-endo-exo-5,8-          
    dimethanonaphthalene -- 0.25      
111422 S Diethanolamine 0.46 2      
109897 S Diethylamine 5 15 C    
112367 S Diethylene glycol diethyl ether,          
    Ethyl diglyme 5 33      
111966 S Diethylene glycol dimethyl ether, Diglyme 1 5.5   5 27
100378 S 2-(Diethylamino) ethanol 2 9.6      
123911   1,4-Diethylene dioxide; see p-Dioxane          
111400 S Diethylenetriamine 1 4      
60297   Diethyl ether; see Ethyl ether          
298044   Di-(2-ethylhexyl) phthalate;          
    see Di-sec-octyl phthalate          
96220   Diethyl ketone 200 705   300 1057
84662   Diethyl phthalate -- 5      
75616   Difluorodibromomethane; dibromodifluoromethane 100 860      
2238075   Diglycidyl ether; DGE; bis(2,3-epoxypropyl)          
    ether 0.1 0.5      
123319   p-Dihydroxybenzene; see Hydroquinone          
108838   Diisobutyl ketone; 2,6-dimethyl-4-heptanone 25 150      
108189 S Diisopropylamine 5 20      
108203   Diisopropyl ether; see Isopryl ether          
109875   Dimethoxymethane; see Methylal          
127195 S Dimethylacetamide 10 35      
124403   Dimethylamine 5 9.2   15 27.6
60117   4-Dimethylaminoazobenzene, see Section 5209          
1300738   Dimethylaminobenzene; see Xylidene          
121697 S N,N-Dimethylaniline; dimethylphenylamine 5 25   10 50
1330207   Dimethylbenzene; see Xylene          
108849   1,3-Dimethylbutyl acetate; see sec-          
    Hexyl acetate          
300765   o,o-Dimethyl o-(1,2-dibromo-2,2-dichloroethyl)          
    phosphate; see Naled          
14857342   Dimethylethoxysilane 0.5 2.1   1.5 6.4
68122 S Dimethylformamide; DMF 10 30      
108838   2,6-Dimethyl-4-heptanone; see          
    Diisobutyl ketone          
57147 S 1,1-Dimethylhydrazine 0.01 0.025      
67641   Dimethyl ketone; see Acetone          
62759   N,N-Dimethylnitrosamine; see          
    N-Nitrosodimethylamine, Section 5209          
131113   Dimethyl phthalate -- 5      
77781 S Dimethyl sulfate; methyl sulfate 0.1 0.5      
148016   Dinitolmide; 3,5-Dinitro-o-toluamide -- 5      
528290, S Dinitrobenzene (all (isomers)          
99650,   ortho, meta and          
100254   para isomers 0.15 1      
534521 S 4,6-Dinitro-o-cresol; 2-methyl-          
    4,6-dinitrophenol -- 0.2      
25321146 S 2,4-Dinitrotoluene -- 0.15      
123911 S p-Dioxane, tech. grade;          
    1,4-dioxacyclohexane; 25 90      
    1,4-diethylene dioxide          
78342 S Dioxathion -- 0.2      
92524   Diphenyl; see Biphenyl          
122394   Diphenylamine; N-phenylaniline -- 10      
101688   Diphenylmethane diisocyanate; see          
    Methylene bis(phenylisocyanate)          
123193   Dipropyl ketone 50 235      
34590948 S Dipropylene glycol methyl ether 100 600   150 900
85007   Diquat; 1,1'-ethylene-2,2'-          
    dipyridinium dibromide --        
    Total dust -- 0.5      
    Respirable fraction(n)          
117817   Di-sec-octyl phthalate; bis(2 ethylhexyl) phthalate -- 5   --
97778   Disulfiram -- 2      
298044 S Disulfoton; o,o-diethyl          
      S-2-(ethylthio)ethyl phosphorodithioate -- 0.1      
128370   2,6-Di-tert-butyl-p-cresol -- 10      
330541   Diuron -- 10      
68122   DMF; see Dimethylformamide          
57147   DMH; see 1,1-Dimethylhydrazine          
1321740   Divinyl benzene 10 50      
    Dust, nuisance dust and particulates,          
    see Particulates not otherwise regulated          
12415348   Emery; see Particulates not otherwise regulated          
115297 S Endosulfan; 6,7,8,9,10,10-hexachloro-          
    1,5,5a,6,9,9a-hexahydro-6,9-methano-2,4,          
    3-benzodioxathiepin-3-oxide -- 0.1      
72208 S Endrin; 1,2,3,4,10,10-hexachloro-6,7-epoxy-          
    1,4,4a,5,6,7,8,8a-octahydro-1,4-endo-endo-5,          
    8-dimethanonaphthalene -- 0.1      
13838169   Enflurane 2 15      
106898 S Epichlorohydrin; 1-chloro-2,          
    3-epoxypropane 0.05 0.19      
2104645 S EPN; o-ethyl o-(p-nitrophenyl)          
    phenylphosphonothioate -- 0.1      
75569   1,2-Epoxypropane; see Propylene oxide          
556525   2,3-Epoxypropanol; see Glycidol          
74840   Ethane (h) --      
75081   Ethanethiol; see Ethyl mercaptan          
64175   Ethanol; see Ethyl alcohol          
141435   Ethanolamine; 2-aminoethanol 3 8   6 15
563122 S Ethion -- 0.4      
110805 S 2-Ethoxyethanol 5 18      
111159 S 2-Ethoxyethyl acetate 5 27      
141786   Ethyl acetate 400 1,400      
140885 S Ethyl acrylate 5 20   25 100
64175   Ethyl alcohol; ethanol 1,000 1,900      
75047 S Ethylamine 5 9.2 C    
541855   Ethyl sec-amyl ketone; 5-methyl-3-heptanone 25 130      
100414   Ethylbenzene 100 435   125 545
74964 S Ethyl bromide 5 22      
106354   Ethyl butyl ketone; 3-heptanone 50 230   75 345
75003 S Ethyl chloride; chloroethane 100 264      
7085850 Ethyl cyanoacrylate 0.2 1.02      
673923 Ethyl tert-butyl ether 5 21      
74851   Ethylene (h) --      
107073 S Ethylene chlorohydrin; 2-chloroethanol 1 3 C    
107153   Ethylenediamine; 1,2-diaminoethane 10 25      
106934 S Ethylene dibromide; 1,2-dibromoethane,          
    see Section 5219 0.13 1 C    
107062   Ethylene dichloride; 1,2-dichloroethane 1 4 200 ppm 2 8
107211   Ethylene glycol (vapor) 40 100 C    
629141 S Ethylene glycol diethyl ether, 1,2-diethoxyethane 5 24      
110714 S Ethylene glycol dimethyl ether, 1 3.7   5 18
    1,2-dimethoxyethane, Glyme          
628966 S Ethylene glycol dinitrate   (k)   -- 0.1
110805 S Ethylene glycol monoethyl ether, see          
    2-Ethoxyethanol          
109864 S Ethylene glycol monomethyl ether, see          
    2-Methoxyethanol          
110496 S Ethylene glycol monomethyl ether acetate;          
    see 2-Methoxyethyl acetate          
151564 S Ethyleneimine; see also Section 5209 0.5 1      
75218   Ethylene oxide; see Section 5220 1 2   5  
60297   Ethyl ether 400 1,200   500 1500
109944   Ethyl formate 100 300      
75343   Ethylidene chloride; see 1,1-Dichloroethane          
16219753   Ethylidene norbornene 5 25 C    
75081   Ethyl mercaptan; ethanethiol 0.5 1      
78933   Ethyl methyl ketone; see Methyl ethyl ketone          
100743 S N-Ethylmorpholine; 4-ethyl-1,          
      4-tetrahydrooxazine 5 23      
78104   Ethyl silicate; tetraethyl silicate 10 85      
22224926 S Fenamiphos   0.1      
115902   Fensulfothion -- 0.1      
55389 S Fenthion -- 0.2      
14484641   Ferbam; ferric N,N-dimethylthiocarbamate -- 10      
12604589   Ferrovanadium dust -- 1   -- 3
14808607   Fibrous glass, see Glass          
    Flour dust   0.5(s)      
    Fluorides, as F -- 2.5      
7782414   Fluorine 0.1 0.2      
75694   Fluorocarbon 11; see Trichlorofluoromethane          
75718   Fluorocarbon 12; see Dichlorodifluoromethane          
75434   Fluorocarbon 21; see Dichlorofluoromethane          
75456   Fluorocarbon 22; see Chlorodifluoromethane          
76120   Fluorocarbon 112; see 1,1,2,2-Tetrachloro-          
    1,2-difluoroethane          
76131   Fluorocarbon 113; see 1,1,2-Trichloro-1,2,2-          
    trifluoroethane          
    Fluorocarbon 114; see 1,2-          
    Dichlorotetrafluoroethane          
75694   Fluorotrichloromethane; see          
    Trichlorofluoromethane          
944229 S Fonofos -- 0.1      
50000   Formaldehyde, see Section 5217 0.75 --   2 --
75127 S Formamide 10 18      
64186   Formic acid 5 9   10 19
98011 S Furfural 2 8      
98000 S Furfuryl alcohol 10 40   15 60
8006619   Gasoline 300 900   500 1500
7782652   Germanium tetrahydride 0.2 0.6      
    Glass, fibrous 1.0 f/cc(q)        
111308   Glutaraldehyde (t) 0.05 0.2 C    
56815   Glycerin mist; see Particulates not otherwise regulated          
123944   Glyceryl stearate -- 10      
556525   Glycidol; 2,3-epoxy-1-propanol 2 6.1      
111762   Glycol monobutyl ether; see 2-Butoxyethanol          
110805   Glycol monoethyl ether; see 2-Ethoxyethanol          
109864   Glycol monoethyl ether; see 2-Methoxyethanol          
    Grain dust (oat, wheat, barley) -- 10      
7782425   Graphite, natural respirable dust   2.5      
    Graphite, synthetic          
    Total dust -- 10      
    Respirable fraction(n) -- 5      
13397245   Gypsum; Calcium sulfate dihydrate; see          
    Particulates not otherwise regulated          
7440586   Hafnium -- 0.5      
151677   Halothane 2 16      
822060   HDI; see Hexamethylene diisocyanate          
7440597   Helium (h) --      
76448 S Heptachlor; 1,4,5,6,7,8,8-hepta-chloro-          
    3a,4,7,7a-tetrahydro-4,7-methanoindene -- 0.05      
142825   n-Heptane 400 1,600   500 2000
118741 S Hexachlorobenzene -- 0.002      
87683 S Hexachlorobutadiene 0.02 0.24      
77474   Hexachlorocyclopentadiene 0.01 0.11      
67721 S Hexachloroethane; perchloroethane 1 10      
1335871 S Hexachloronaphthalene -- 0.2      
684162 S Hexafluoroacetone; 1,1,1,3,3,3-hexafluoro-          
    2-propanone 0.1 0.7      
822060   Hexamethylene diisocyanate; HDI 0.005 0.034      
110543 S n-Hexane 50 180      
    Hexane, other isomers 500 1800   1000 3600
124094   1,6-Hexanediamine 0.5 2.3      
591786   2-Hexanone; see Methyl butyl ketone          
592416   1-Hexene 50 180      
108101   Hexone; see Methyl isobutyl ketone          
108849   sec-Hexyl acetate; 4-methyl-2-pentyl acetate;          
    1,3-dimethyl-butyl acetate 50 300      
107415   Hexylene glycol 25 125 C    
302012 S Hydrazine 0.01 0.013      
10035106   Hydrobromic acid; see Hydrogen bromide          
7647010   Hydrochloric acid; see Hydrogen chloride          
74908   Hydrocyanic acid; see Hydrogen cyanide          
7664393   Hydrofluoric acid; see Hydrogen fluoride          
1333740   Hydrogen (h) --      
61788327   Hydrogenated terphenyls 0.5 5      
10035106   Hydrogen bromide 3 10 C    
7647010   Hydrogen chloride; muriatic acid 5 7 C    
74908 S Hydrogen cyanide 4.7 5 C    
7664393   Hydrogen fluoride, as F 3 2.5   6 --
7722841   Hydrogen peroxide, as H2O2 1 1.4      
7783075   Hydrogen selenide, as Se 0.05 0.2      
7783064   Hydrogen sulfide 10 14 50 ppm 15 21
123319   Hydroquinone; 1,4-benezendiol -- 2      
999611 S 2-Hydroxypropyl acrylate 0.5 3      
95136   Indene 10 48      
7440746   Indium -- 0.1      
    Indium compounds -- 0.1      
7553562   Iodine 0.1 1 C    
75478   Iodoform 0.6 10      
4098719   IPDI; see Isophorone diisocyanate          
1309371   Iron oxide fume -- 5      
13463406   Iron pentacarbonyl, as Fe 0.1 0.8   0.2 1.6
    Iron salts, soluble, as Fe -- 1      
123922   Isoamyl acetate; 3-methylbutyl acetate; see Pentyl acetate          
123513   Isoamyl alcohol; 3-methylbutanol 100 360   125 450
110190   Isobutyl acetate; 2-methylpropyl acetate 150 700      
78831   Isobutyl alcohol; 2-methylpropanol 50 150      
26675467   Isoflurane 2 15      
26952216 S Isooctyl alcohol 50 270      
78591   Isophorone; 3,5,5-trimethyl-2-cyclohexene-          
    1-one 4 23      
4098719 S Isophorone diisocyanate; IPDI 0.005 0.045   0.02 --
109591   Isopropoxyethanol 25 105      
108214   Isopropyl acetate 250 950   310 1185
67630   Isopropyl alcohol 400 980   500 1225
75310   Isopropylamine 5 12   10 24
768525 S N-isopropylaniline 2 10      
108203   Isopropyl ether; diisopropyl ether 250 1,050      
4016142   Isopropyl glycidyl ether; IGE;          
    1,2-epoxy-3-isopropoxypropane 50 240   75 360
1332587   Kaolin; (respirable dust containing no          
    asbestos and <1% crystaline silica) -- 2      
463514   Ketene; ethenone 0.5 0.9   1.5 3
    Lead arsenate, see Sections 5214 and 5198          
7758976   Lead chromate, as Pb -- 0.02      
    as Cr -- 0.005      
    (see also Section 5198, 1532.1, 1532.2, 5206 & 8359)          
    Lead (metallic) and inorganic compounds, dust          
    and fume, as Pb (see also Section 5198 ) -- 0.05      
78002   Lead tetraethyl, see Tetraethyl lead          
75741   Lead tetramethyl, see Tetramethyl lead          
1317653   Limestone; calcium carbonate; see          
    Particulates not otherwise regulated          
58899 S Lindane; 1,2,3,4,5,6-hexachlorocyclohexane,          
    gamma isomer -- 0.5      
7580678   Lithium hydride -- 0.025      
    L.P.G.; liquefied petroleum gas 1,000 1,800      
4485125   Lithium stearate -- 10      
13717005   Magnesite; magnesium carbonate; see          
    Particulates not otherwise regulated          
1309484   Magnesium oxide fume, as Mg -- 10      
557040   Magnesium stearate -- 10      
121755 S Malathion; o,o-dimethyl S-1(1,2-          
    dicarboethyoxyethyl) phosphorodithioate -- 10      
108316   Maleic anhydride; cis-butenedioic anhydride 0.1 0.4      
    Manganese and compounds, as Mn -- 0.2      
7439965   Manganese fume, as Mn -- 0.2   -- 3
12079651 S Manganese, cyclopentadienyl-tricarbonyl,          
    as Mn -- 0.1      
    Manganese tetroxide -- 0.2      
    Marble; calcium carbonate; see          
    Particulates not otherwise regulated          
101779 S MDA; see 4,4'-Methylene dianiline          
101688   MDI; see Methylene bis(phenylisocyanate)          
7439976 S Mercury alkyls, as Hg -- 0.01 0.04 mg/M3 -- 0.03
7439976 S Mercury, metallic and inorganic compounds as Hg -- 0.025 0.1 mg/M3    
7439976 S Mercury aryl compounds as Hg -- 0.01 C    
108678   Mesitylene; see 1,3,5-Trimethylbenzene          
141797   Mesityl oxide; 4-methyl-3-pentene-2-one 15 60   25 100
79414 S Methacrylic acid 20 70      
74828   Methane (h) --      
74931   Methanethiol; see Methyl mercaptan          
67561   Methanol; see Methyl alcohol          
16752775 S Methomyl -- 2.5      
72435   Methoxychlor; 1,1,1-trichloro-2,          
    2-bis(p-methoxyphenyl)ethane -- 10      
109864 S 2-Methoxyethanol 5 16      
110496   2-Methoxyethyl acetate 5 24      
76380   Methoxyflurane 2 13      
150765   4-Methoxyphenol -- 5      
79209   Methyl acetate 200 610   250 760
74997   Methyl acetylene; propyne 1,000 1,650      
    Methyl acetylene-propadiene mixture; MAPP 1,000 1,800   1250 2250
96333 S Methyl acrylate 10 35      
126987 S alpha-Methylacrylonitrile 1 3      
624419 2-Methylbutyl acetate; see Pentyl acetate          
109875   Methylal; dimethoxymethane 1,000 3,100      
67561 S Methyl alcohol; methanol 200 260 1000 ppm 250 325
74895   Methylamine 5 6.4   15 19
108112   Methyl amyl alcohol; see Methyl          
    isobutyl carbinol          
110430   Methyl n-amyl ketone; 2-heptanone 50 235      
100618 S N-Methylaniline; monomethylaniline 0.5 2      
95534   o-Methylaniline; see o-Toluidine          
74839 S Methyl bromide 1 3.88 20 ppm    
591786 S Methyl butyl ketone; 2-hexanone 5 20      
74873   Methyl chloride 50 105 300 ppm 100 210
71556   Methyl chloroform; 1,1,1-trichloroethane 350 1900 800 ppm 450 2450
107302   Methyl chloromethyl ether; see Section 5209          
75058   Methyl cyanide; see Acetonitrile          
137053   Methyl 2-cyanoacrylate 0.2 0.908   4  
108872   Methylcyclohexane 400 1,600      
25639423   Methylcyclohexanol (meta- and          
    para-isomer mixture) 50 235      
583608 S o-Methylcyclohexanone 50 230   75 345
12108133 S 2-Methylcyclopentadienyl manganese