PELs from Navy table, reformatted. All footnotes *, (a) – (m) are at last page of this document.
Where substance specific standards exist (e.g. acrylonitrile) they are referenced.
Substance
CAS No. (f)
Acetaldehyde
Acetic acid
Acetic anhydride
Acetone
Acetonitrile
2-Acetylaminofluorine; see
1910.1014
Acetylene dichloride; see1,2-Dichloroethylene
Acetylene tetrabromide
Acetylsalicylic acid
(Aspirin)
Acrolein
Acrylamide
Acrylic acid
Acrylonitrile; see 1910.1045
Aldrin
Allyl alcohol
Allyl chloride
Allyl glycidyl ether (AGE)
Allyl propyl disulfide
alpha-Alumina
Total dust
Respirable fraction
Aluminum (as Al) Metal
Total dust
Respirable fraction
Pyro powders
Welding fumes*
Soluble salts
Alkyls
4-Aminodiphenyl; see
1910.1011
2-Aminoethanol; see
Ethanolamine
2-Aminopyridine
Amitrole
Ammonia
Ammonium chloride fume
Ammonium sulfamate
Total dust
Respirable fraction
n-Amyl acetate
Sec-Amyl acetate
Aniline and homologs
Anisidine (o-,p-isomers)
Antimony and compounds
(as Sb)
ANTU (Alpha naphthylthiourea)
75-07-0
64-19-7
108-24-7
67-64-1
75-05-8
53-96-3
ppm
(a)
100
10
750
40
OSHA Permissible Exposure Limits
TWA
STEL
CEILING
mg/m3
ppm
mg/m3
ppm mg/m3
(b)
(a)
(b)
(a)
(b)
180
150
270
25
5
20
1800
1000
2400
70
60
105
-
p. 1 of 21
Skin
desig
-
540-59-0
79-27-6
50-78-2
107-02-8
79-06-1
79-10-7
107-13-1
309-00-2
107-18-6
107-05-1
106-92-3
2179-59-1
1344-28-1
1
-
14
5
-
-
-
-
-
0.1
10
0.25
0.03
30
0.3
-
0.8
-
-
-
yes
yes
2
1
5
2
0.25
5
3
22
12
4
2
10
3
10
6
44
18
-
-
yes
yes
-
-
10
5
-
-
-
-
-
-
15
5
5
5
2
2
-
-
-
-
-
0.5
-
2
0.2
10
35
-
27
20
-
-
-
100
125
2
-
10
5
525
650
8
0.5
0.5
-
-
-
-
yes
-
-
0.3
-
-
-
-
-
7429-90-5
92-67-1
141-43-5
504-29-0
61-82-5
7664-41-7
12125-02-9
7773-06-0
628-63-7
626-38-0
62-53-3
29191-52-4
7440-36-0
86-88-4
PELs from Navy table, reformatted. All footnotes *, (a) – (m) are at last page of this document.
Where substance specific standards exist (e.g. acrylonitrile) they are referenced.
Substance
CAS No. (f)
Arsenic, organic compounds
(as As)
Arsenic, inorganic
compounds (as As); see
1910.1018
Arsine
Asbestos; see 1910.1001
Atrazine
Azinphos-methyl
Barium, soluble compounds
Barium sulfate
Total dust
Respirable fraction
Benomyl
Total dust
Respirable fraction
Benzene; see 1910.1028.
See Table Z-2 for the limits
applicable in the operations
or sectors excluded in
1910.1028
Benzidine; see 1910.1010
p-Benzoquinone; see
Quinone
Benzo(a)pyrene; see Coal tar
pitch volatiles
Benzoyl peroxide
Benzyl chloride
Beryllium and beryllium
compounds (as Be); see
Table Z-2
Biphenyl; see Diphenyl
Bismuth telluride, undoped
Total dust
Respirable fraction
Bismuth telluride, Se-doped
Borates, tetra, sodium salts
Anhydrous
Decahydrate
Pentahydrate
Boron oxide, total dust
Boron tribromide
Boron trifluoride
Bromacil
Bromine
Bromine pentafluoride
Bromoform
Butadiene (1,3- Butadiene);
see 1910.1051
Butane
Butanethiol; see Butyl
mercaptan
7440-38-2
OSHA Permissible Exposure Limits
TWA
STEL
CEILING
ppm
mg/m3
ppm
mg/m3
ppm mg/m3
(a)
(b)
(a)
(b)
(a)
(b)
0.5
-
p. 2 of 21
Skin
desig
-
7440-38-2
7784-42-1
0.05
0.2
-
-
-
-
-
1912-24-9
86-50-0
7440-39-3
7727-43-7
-
5
0.2
0.5
-
-
-
-
yes
-
-
10
5
-
-
-
-
-
-
10
5
-
-
-
-
-
1
5
5
-
-
-
-
-
-
15
5
5
-
-
-
-
-
1330-43-4
1303-96-4
12179-04-3
1303-86-2
10294-33-4
7637-07-2
314-40-9
7726-95-6
7789-30-2
75-25-2
106-99-0
1
0.1
0.1
0.5
10
10
10
10
10
0.7
0.7
5
0.3
-
2
-
1
1
-
10
3
-
yes
106-97-8
109-79-5
800
1900
-
-
-
-
-
17804-35-2
71-43-2
92-87-5
106-51-4
94-36-0
100-44-7
7440-41-7
92-52-4
1304-82-1
PELs from Navy table, reformatted. All footnotes *, (a) – (m) are at last page of this document.
Where substance specific standards exist (e.g. acrylonitrile) they are referenced.
Substance
CAS No. (f)
2-Butanone (Methyl ethyl
ketone)
2-Butoxyethanol
n-Butyl-acetate
sec-Butyl acetate
tert-Butyl acetate
Butyl acrylate
n-Butyl alcohol
sec-Butyl alcohol
tert-Butyl alcohol
Butylamine
tert-Butyl chromate (as
CrO3); see 1910.1026. If the
exposure limit in 1910.1026
is stayed or is otherwise not
in effect, the exposure limit
is a ceiling of 0.1 mg/m3
n-Butyl glycidyl ether
(BGE)
n-Butyl lactate
Butyl mercaptan
o-sec-Butylphenol
p-tert-Butyltoluene
Cadmium (all forms, as Cd);
see 1910.1027. See Table Z2 for the exposure limits for
any operations or sectors
where the exposure limits in
1910.1027 are stayed or are
otherwise not in effect.
Calcium carbonate
Total dust
Respirable fraction
Calcium cyanamide
Calcium hydroxidei
Calcium oxidej
Calcium silicate
Total dust
Respirable fraction
Calcium sulfate
Total dust
Respirable fraction
Camphor, synthetic
Caprolactam
Dust
Vapor
Captafol (Difolatan®)
Captan
Carbaryl (Sevin®)
Carbofuran (Furadan®)
Carbon black
Carbon dioxide
78-93-3
OSHA Permissible Exposure Limits
TWA
STEL
CEILING
ppm
mg/m3
ppm
mg/m3
ppm mg/m3
(a)
(b)
(a)
(b)
(a)
(b)
200
590
300
885
-
p. 3 of 21
Skin
desig
-
111-76-2
123-86-4
105-46-4
540-88-5
141-32-2
71-36-3
78-92-2
75-65-0
109-73-9
1189-85-1
25
150
200
200
10
100
100
-
120
710
950
950
55
305
300
-
200
150
-
950
450
-
50
5
150
15
yes
yes
yes
2426-08-6
25
135
-
-
-
-
-
138-22-7
109-79-5
89-72-5
98-51-1
7440-43-9
5
0.5
5
10
25
1.5
30
60
20
120
-
-
yes
-
-
15
5
0.5
5i
5j
-
-
-
-
-
-
15
5
-
-
-
-
-
-
15
5
2
-
-
-
-
-
5
10,000
1
20
0.1
5
5
0.1
3.5
18,000
10
-
3
40
54,000
-
-
-
1317-65-3
156-62-7
1305-62-0
1305-78-8
1344-95-2
7778-18-9
76-22-2
105-60-2
2425-06-1
133-06-2
63-25-2
1563-66-2
1333-86-4
124-38-9
30,000
PELs from Navy table, reformatted. All footnotes *, (a) – (m) are at last page of this document.
Where substance specific standards exist (e.g. acrylonitrile) they are referenced.
Substance
CAS No. (f)
Carbon disulfide
Carbon monoxide
Carbon tetrabromide
Carbon tetrachloride
Carbonyl fluoride
Catechol (Pyrocatechol)
Cellulose
Total dust
Respirable fraction
Cesium hydroxide
Chlordane
Chlorinated camphene
Chlorinated diphenyl oxide
Chlorine
Chlorine dioxide
Chlorine trifluoride
Chloroacetaldehyde
alpha-Chloroacetophenone
(Phenacy1 chloride)
Chloroacetyl chloride
Chlorobenzene
o-Chlorobenzylidene
malononitrile
Chlorobromomethane
2-Chloro-1,3-butadiene; see
beta-Chloroprene
Chlorodifluoromethane
Chlorodiphenyl (42%
Chlorine) (PCB)
Chlorodiphenyl (54%
Chlorine) (PCB)
1-Chloro,2,3-epoxypropane;
see Epichlorohydrin
2-Chloroethanol; see
Ethylene chlorohydrin
Chloroethylene; see Vinyl
chloride
Chloroform
(Trichloromethane)
bis(Chloromethyl) ether; see
1910.1008
Chloromethyl methyl ether;
see 1910.1006
1-Chloro-l-nitropropane
Chloropentafluoroethane
Chloropicrin
beta-Chloroprene
o-Chlorostyrene
o-Chlorotoluene
75-15-0
630-08-050
558-13-4
56-23-5
353-50-4
120-80-9
9004-34-6
ppm
(a)
4
35
0.1
2
2
OSHA Permissible Exposure Limits
TWA
STEL
CEILING
mg/m3
ppm
mg/m3
ppm mg/m3
(b)
(a)
(b)
(a)
(b)
12
12
36
40
200
229
1.4
0.3
4
12.6
5
5
15
5
20
-
21351-79-1
57-74-9
8001-35-2
55720-99-5
7782-50-5
10049-04-4
7790-91-2
107-20-0
532-27-4
0.5
0.1
0.05
15
5
2
0.5
0.5
0.5
1.5
0.3
0.3
79-04-9
108-90-7
2698-41-1
0.05
75
-
74-97-5
126-99-8
-
p. 4 of 21
Skin
desig
yes
yes
1
0.3
-
1
3
0.9
-
0.1
1
-
0.4
3
-
yes
yes
-
0.2
350
-
-
-
0.05
0.4
yes
200
1050
-
-
-
-
-
75-45-6
53469-21-9
1000
-
3500
1
-
-
-
-
yes
11097-69-1
-
0.5
-
-
-
-
yes
2
9.78
-
-
-
-
-
2
1000
0.1
10
50
50
10
6320
0.7
35
285
250
75
-
428
-
-
-
yes
-
106-89-8
107-07-3
75-01-4
67-66-3
542-88-1
107-30-2
600-25-9
76-15-3
76-06-2
126-99-8
2039-87-4
95-49-8
PELs from Navy table, reformatted. All footnotes *, (a) – (m) are at last page of this document.
Where substance specific standards exist (e.g. acrylonitrile) they are referenced.
Substance
CAS No. (f)
2-Chloro-6-trichloro-methyl
pyridine
Total dust
Respirable fraction
Chlorpyrifos
Chromic acid and chromates
(as CrO3); see 1910.1026.
See Table Z-2 for the
exposure limit for any
operations or sectors where
the exposure limit in
1910.1026 is stayed or are
otherwise not in effect.
Chromium, soluble chromic,
chromous salts (as Cr)
Chromium VI compounds;
see 1910.1026. See Table Z2 for the exposure limit for
any operations or sectors
where the exposure limit in
1910.1026 is stayed or are
otherwise not in effect.
Chromium metal and
insoluble salts
Chrysene; see Coal tar pitch
volatiles
Clopidol
Total dust
Respirable fraction
Coal dust (less than5%
Si02), quartz, respirable
fraction
Coal dust (greater than or
equal to 5% Si02), respirable
quartz fraction
Coal tar pitch volatiles
(benzene soluble fraction),
anthracene, BaP, phenanthrene, acridine, chrysene,
pyrene
Cobalt metal, dust, and fume
(as Co)
Cobalt carbonyl (as Co)
Cobalt hydrocarbonyl (as
Co)
Coke oven emissions; see
1910.1029
Copper
Fume (as Cu)
Dusts and mists (as Cu)
1929-82-4
OSHA Permissible Exposure Limits
TWA
STEL
CEILING
ppm
mg/m3
ppm
mg/m3
ppm mg/m3
(a)
(b)
(a)
(b)
(a)
(b)
p. 5 of 21
Skin
desig
-
15
5
0.2
-
-
-
-
yes
-
0.5
-
-
-
-
-
-
1
-
-
-
-
-
-
15
5
2
-
-
-
-
-
-
0.1
-
-
-
-
-
8007-45-2
-
0.2
-
-
-
-
-
7440-48-4
-
0.05
-
-
-
-
-
10210-68-1
16842-03-8
-
0.1
0.1
-
-
-
-
-
-
0.1
1
-
-
-
-
-
2921-88-2
7440-47-3
7440-47-3
7440-47-3
(18540-299)
7440-47-3
2971-90-6
7440-50-8
PELs from Navy table, reformatted. All footnotes *, (a) – (m) are at last page of this document.
Where substance specific standards exist (e.g. acrylonitrile) they are referenced.
Substance
Cotton dust, raw This 8-hour
TWA applies to respirable
dust as measured by a
vertical elutriator cotton dust
or equivalent instrument.
The time-weighted average
applies to the cotton waste
processing operations of
waster recycling (sorting,
blending, cleaning, and
willowing) and garnetting.
See also 1910.1043 for
cotton dust limits applicable
to other sectors.
Crag herbicide (Sesone)
Total dust
Respirable fraction
Cresol, all isomers
Crotonaldehyde
Crufomate
Cumene
Cyanamide
Cyanides (as CN)
Cyanogen
Cyanogen chloride
Cyclohexane
Cyclohexanol
Cyclohexanone
Cyclohexene
Cyclohexylamine
Cyclonite
Cyclopentadiene
Cyclopentane
Cyhexatin
2,4-D
(Dichlorophenoxyacetic
acid)
Decaborane
Demton-(Systox®)
Dichlorodiphenyltrichloroethane (DDT)
Dichlorvos (DDVP)
Diacetone alcohol (4Hydroxy-4-methyl-2pentanone)
1,2-Diaminoethane; see
Ethylenediamine
Diazinon
Diazomethane
Diborane
CAS No. (f)
OSHA Permissible Exposure Limits
TWA
STEL
CEILING
ppm
mg/m3
ppm
mg/m3
ppm mg/m3
(a)
(b)
(a)
(b)
(a)
(b)
1
-
p. 6 of 21
Skin
desig
-
136-78-7
5
2
10
5
22
6
-
-
-
-
yes
-
1319-77-3
123-73-9
4170-30-3
299-86-5
98-82-8
420-04-2
Varies with
compound
460-19-5
506-77-4
110-82-7
108-93-0
108-94-1
110-83-8
108-91-8
121-82-4
542-92-7
287-92-3
13121-70-5
94-75-7
50
-
5
245
2
5
-
-
-
-
-
-
-
-
yes
-
10
300
50
25
300
10
75
600
-
20
1050
200
100
1015
40
1.5
200
1720
5
10
-
-
0.3
-
0.6
-
yes
yes
yes
-
-
-
-
-
17702-41-9
8065-48-3
50-29-3
0.05
-
0.3
0.1
1
0.15
-
0.9
-
-
-
-
-
yes
yes
yes
50
1
240
-
-
-
-
yes
-
0.2
0.1
0.1
0.4
0.1
-
-
-
-
yes
-
62-73-78
123-42-2
107-15-3
333-41-5
334-88-3
19287-45-7
PELs from Navy table, reformatted. All footnotes *, (a) – (m) are at last page of this document.
Where substance specific standards exist (e.g. acrylonitrile) they are referenced.
Substance
CAS No. (f)
1,2-Dibromo-3chloropropane; see
1910.1044
2-N-Dibutylaminoethanol
Dibutyl phosphate
Dibutyl phthalate
Dichloroacetylene
o-Dichlorobenzene
p-Dichlorobenzene
3,3'-Dichlorobenzidine; see
1910.1007
Dichlorodifluoromethane
1,3-Dichloro-5,5-dimethyl
hydantoin
1,1-Dichloroethane
1,2-Dichloroethylene
Dichloroethyl ether
Dichloromethane; see
Methylene chloride
Dichloromonofluoromethane
1,1-Dichloro-1-nitroethane
1,2-Dichloropropane; see
Propylene dichloride
1,3-Dichloropropene
2,2-Dichloropropionic acid
Dichlorotetrafluoroethane
Dicrotophos
Dicyclopentadiene
Dicyclopentadienyl iron
Total dust
Respirable fraction
Dieldrin
Diethanolamine
Diethylamine
2-Diethylaminoethanol
Diethylene triamine
Diethyl ether; see Ethyl
ether
Diethyl ketone
Diethyl phthalate
Difluorodibromomethane
Diglycidyl ether (DGE)
Dihydroxybenzene; see
Hydroquinone
Diisobutyl ketone
Diisopropylamine
4-Dimethylaminoazo
benzene; see 1910.1015
Dimethoxymethane;
see Methylal
Dimethyl acetamide
Dimethylamine
96-12-8
OSHA Permissible Exposure Limits
TWA
STEL
CEILING
ppm
mg/m3
ppm
mg/m3
ppm mg/m3
(a)
(b)
(a)
(b)
(a)
(b)
p. 7 of 21
Skin
desig
102-81-8
107-66-4
84-74-2
7572-29-4
95-50-1
106-46-7
91-94-1
2
1
75
14
5
5
450
2
110
10
675
0.1
50
-
0.4
300
-
-
75-71-8
118-52-5
1000
-
4950
0.2
-
0.4
-
-
-
75-34-3
540-59-0
111-44-4
75-09-2
100
200
5
400
790
30
10
60
-
-
yes
75-43-4
594-72-9
78-87-5
10
2
40
10
-
-
-
-
-
542-75-6
75-99-0
76-14-2
141-66-2
77-73-6
102-54-5
1
1
1000
5
5
6
7000
0.25
30
-
-
-
-
yes
yes
-
3
10
10
1
10
5
0.25
15
30
50
4
25
-
75
-
-
-
yes
yes
-
96-22-0
84-66-2
75-61-6
2238-07-5
123-31-9
200
100
0.1
705
5
860
0.5
-
-
-
-
-
108-83-8
108-18-9
60-11-7
25
5
150
20
-
-
-
-
yes
10
10
35
18
-
-
-
-
yes
-
60-57-1
111-42-2
109-89-7
100-37-0
111-40-0
60-29-7
109-87-5
127-19-5
124-40-3
PELs from Navy table, reformatted. All footnotes *, (a) – (m) are at last page of this document.
Where substance specific standards exist (e.g. acrylonitrile) they are referenced.
Substance
CAS No. (f)
Dimethylaminobenzene;
see Xylidine
Dimethylaniline (N,NDimethylaniline)
Dimethylbenzene;
see Xylene
Dimethyl-1,2-dibromo-2,2dichloroethyl phosphate
Dimethylformamide
2,6-Dimethyl-4-heptanone;
see Diisobutyl ketone
1,1-Dimethylhydrazine
Dimethylphthalate
Dimethyl sulfate
Dinitolmide (3,5-Dinitro-otoluamide)
Dinitrobenzene (all isomers)
1300-73-8
Dinitro-o-cresol
Dinitrotoluene
Dioxane (Diethylene
dioxide)
Dioxathion (Delnav)
Diphenyl (Biphenyl)
Diphenylamine
Diphenylmethane
diisocyanate; see Methylene
bisphenyl isocyanate
Dipropylene glycol methyl
ether
Dipropyl ketone
Diquat
Di-sec octyl phthalate (Di-2ethylhexyl phthalate)
Disulfiram
Disulfoton
2,6-Di-tert-butyl-p-cresol
Diuron
Divinyl benzene
Emery
Total dust
Respirable fraction
Endosulfan
Endrin
Epichlorohydrin
EPN
1,2-Epoxypropane; see
Propylene oxide
OSHA Permissible Exposure Limits
TWA
STEL
CEILING
ppm
mg/m3
ppm
mg/m3
ppm mg/m3
(a)
(b)
(a)
(b)
(a)
(b)
p. 8 of 21
Skin
desig
121-69-7
5
25
10
50
-
-
yes
Varies with
isomer
300-76-5
-
3
-
-
-
-
yes
68-12-2
108-83-8
10
30
-
-
-
-
yes
57-14-7
131-11-3
77-78-1
148-01-6
0.5
0.1
-
1
5
0.5
5
-
-
-
-
yes
(ortho):
528-29-0
(meta): 9965-0 (para-):
100-25-4
-
1
-
-
-
-
yes
534-52-1
25321-14-6
123-91-1
25
0.2
1.5
90
-
-
-
-
yes
yes
yes
78-34-2
92-52-4
122-39-4
101-68-8
0.2
-
0.2
1
10
-
-
-
-
yes
-
34590-94-8
100
600
150
900
-
-
yes
123-19-3
85-00-7
117-81-7
50
-
235
0.5
5
-
10
-
-
-
97-77-8
298-04-4
128-37-0
330-54-1
1321-74-0
12415-34-8
10
2
0.1
10
10
50
-
-
-
-
yes
-
2
-
10
5
0.1
0.1
8
0.5
-
-
-
-
yes
yes
yes
yes
115-29-7
72-20-8
106-89-8
2104-64-5
yes
-
PELs from Navy table, reformatted. All footnotes *, (a) – (m) are at last page of this document.
Where substance specific standards exist (e.g. acrylonitrile) they are referenced.
Substance
2,3-Epoxy-l-propanol; see
Glycidol
Ethanethiol; see Ethyl
mercaptan
Ethanolamine
Ethion
2-Ethoxyethanol
2-Ethoxyethyl acetate
(Cellosolve acetate)
Ethyl acetate
Ethyl acrylate
Ethyl alcohol (Ethanol)
Ethylamine
Ethyl amyl ketone (5Methyl-3-heptanone)
Ethyl benzene
Ethyl bromide
Ethyl butyl ketone (3Heptanone)
Ethyl chloride
Ethyl ether
Ethyl formate
Ethyl mercaptan
Ethyl silicate
Ethylene chlorohydrin
Ethylenediamine
Ethylene dibromide; see
Table Z-2
Ethylene dichloride
Ethylene glycol
Ethylene glycol dinitrate
Ethylene glycol methyl
acetate; see Methyl
cellosolve acetate
Ethyleneimine; see
1910.1012
Ethylene oxide; see
1910.1047
Ethylidene chloride; see 1,1Dichloroethane
Ethylidene norbornene
N-Ethylmorpholine
Fenamiphos
Fensulfothion (Dasanit)
Fenthion
Ferbam, total dust
Ferrovanadium dust
Fluorides (as F)
Fluorine
Fluorotrichloromethane
(Trichlorofluoromethane)
p. 9 of 21
CAS No. (f)
OSHA Permissible Exposure Limits
TWA
STEL
CEILING
ppm
mg/m3
ppm
mg/m3
ppm mg/m3
(a)
(b)
(a)
(b)
(a)
(b)
141-43-5
563-12-2
110-80-5
111-15-9
3
200
100
8
0.4
740
540
6
-
15
-
-
-
yes
-
141-78-6
140-88-5
64-17-5
75-04-7
541-85-5
400
5
1000
10
25
1400
20
1900
l8
130
25
-
100
-
-
-
yes
-
100-41-4
74-96-4
106-35-4
100
200
50
435
890
230
125
250
-
545
1110
-
-
-
-
75-00-3
60-29-7
109-94-4
75-08-1
78-10-4
107-07-3
107-15-3
106-93-4
1000
400
100
0.5
10
10
2600
1200
300
1
85
25
500
1500
-
-
1
3
-
yes
-
107-06-2
107-21-1
628-96-6
110-49-6
1
-
4
-
2
-
8
0.1
50
-
125
-
-
5
-
23
0.1
0.1
0.2
10
1
2.5
-
3
-
5
-
25
-
yes
yes
yes
-
0.1
-
0.2
-
-
-
1000
5600
-
Skin
desig
-
151-56-4
75-21-8
75-34-3
16219-75-3
100-74-3
22224-92-6
115-90-2
55-38-9
14484-64-1
12604-58-9
Varies with
compound
7782-41-4
75-69-4
PELs from Navy table, reformatted. All footnotes *, (a) – (m) are at last page of this document. p. 10 of 21
Where substance specific standards exist (e.g. acrylonitrile) they are referenced.
Substance
CAS No. (f)
Fonofos
Formaldehyde; see
1910.1048
Formamide
Formic acid
Furfural
Furfuryl alcohol
Gasoline
Gemanium tetrahydride
Glutaraldehyde
Glycerin (mist)
Total dust
Respirable fraction
Glycidol
Glycol monoethyl ether; see
2-Ethoxyethanol
Grain dust (oat, wheat,
barley)
Graphite, natural respirable
dust
Graphite, synthetic
Total dust
Respirable fraction
Guthion;
see Azinphos methyl
Gypsum
Total dust
Respirable fraction
Hafnium
Heptachlor
Heptane (n-Heptane)
Hexachlorobutadiene
Hexachlorocyclopentadiene
Hexachloroethane
Hexachloronaphthalene
Hexafluoroacetone
n-Hexane
Hexane isomers
944-22-9
50-00-0
2-Hexanone (Methyl n-butyl
ketone)
Hexone (Methyl isobutyl
ketone)
sec-Hexyl acetate
Hexylene glycol
Hydrazine
Hydrogenated terphenyls
Hydrogen bromide
Hydrogen chloride
Hydrogen cyanide
Hydrogen fluoride (as F)
Hydrogen peroxide
75-12-7
64-18-6
98-01-1
98-00-0
8006-61-9
7782-65-2
111-30-8
56-81-5
OSHA Permissible Exposure Limits
TWA
STEL
CEILING
ppm
mg/m3
ppm
mg/m3
ppm mg/m3
(a)
(b)
(a)
(b)
(a)
(b)
0.1
-
Skin
desig
yes
20
5
2
10
300
0.2
-
30
9
8
40
900
0.6
-
30
15
500
-
45
60
1500
-
0.2
0.8
yes
yes
-
25
10
5
75
-
-
-
-
-
-
10
-
-
-
-
-
-
2.5
-
-
-
-
-
-
10
5
-
-
-
-
-
400
0.02
0.01
1
0.1
50
500
15
5
0.5
0.5
1600
0.24
0.1
10
0.2
0.7
180
1800
500
1000
2000
3600
-
-
yes
yes
yes
yes
-
5
20
-
-
-
-
-
108-10-1
50
205
75
300
-
-
-
108-84-9
107-41-5
302-01-2
61788-32-7
10035-10-6
7647-01-0
74-90-8
7664-39-3
7722-84-1
50
0.1
0.5
3
1
300
0.1
5
1.4
4.7
6
-
5
-
25
3
5
-
125
10
7
-
yes
yes
-
556-52-5
110-80-5
7782-42-5
86-50-0
13397-24-5
7440-58-6
76-44-8
142-82-5
87-68-3
77-47-4
67-72-1
1335-87-1
684-16-2
110-54-3
Varies with
compound
591-78-6
PELs from Navy table, reformatted. All footnotes *, (a) – (m) are at last page of this document. p. 11 of 21
Where substance specific standards exist (e.g. acrylonitrile) they are referenced.
Substance
CAS No. (f)
Hydrogen selenide (as Se)
Hydrogen sulfide
Hydroquinone
2-Hydroxypropyl acrylate
Indene
Indium and compounds (as
In)
Iodine
Iodoform
Iron oxide fume
Iron pentacarbonyl (as Fe)
Iron salts (soluble) (as Fe)
7783-07-5
7783-06-4
123-31-9
999-61-1
95-13-6
7440-74-6
Isoamyl acetate
Isoamyl alcohol (primary
and secondary)
Isobutyl acetate
Isobutyl alcohol
Isooctyl alcohol
Isophorone
Isophorone diisocyanate
2-Isopropoxyethanol
Isopropyl acetate
Isopropyl alcohol
Isopropylamine
N-Isopropylaniline
Isopropyl ether
Isopropyl glycidyl ether
(IGE)
Kaolin
Total dust
Respirable fraction
Ketene
Lead inorganic (as Pb); see
1910.1025
Limestone
Total dust
Respirable fraction
Lindane
Lithium hydride
L.P.G. (Liquefied petroleum
gas)
Magnesite
Total dust
Respirable fraction
Magnesium oxide fume,
total particulate
Malathion, total dust
Maleic anhydride
Manganese compounds (as
Mn)
ppm
(a)
0.05
10
0.5
10
-
OSHA Permissible Exposure Limits
TWA
STEL
CEILING
mg/m3
ppm
mg/m3
ppm mg/m3
(b)
(a)
(b)
(a)
(b)
0.2
14
15
21
2
3
45
0.1
-
Skin
desig
yes
-
7553-56-2
75-47-8
1309-37-1
13463-40-6
Varies with
compound
123-92-2
123-51-3
0.6
0.1
-
10
10
0.8
1
0.2
-
1.6
-
0.1
-
1
-
-
100
100
525
360
125
450
-
-
-
110-19-0
78-83-1
26952-21-6
78-59-1
4098-71-9
109-59-1
108-21-4
67-63-0
75-31-0
768-52-5
108-20-3
4016-14-2
150
50
50
4
0.005
25
250
400
5
2
500
50
700
150
270
23
105
950
980
12
10
2100
240
0.02
310
500
10
75
1185
1225
24
360
-
-
yes
yes
yes
-
0.5
10
5
0.9
1.5
3
-
-
-
1000
15
5
0.5
0.025
1800
-
-
-
-
yes
-
1309-48-4
-
15
5
10
-
-
-
-
-
121-75-5
108-31-6
7439-96-5
0.25
-
10
1
-
-
-
-
5
yes
-
463-51-4
7439-92-1
1317-65-3
58-89-9
7580-67-8
68476-85-7
546-93-0
PELs from Navy table, reformatted. All footnotes *, (a) – (m) are at last page of this document. p. 12 of 21
Where substance specific standards exist (e.g. acrylonitrile) they are referenced.
Substance
CAS No. (f)
Manganese fume (as Mn)
Manganese cyclopentadienyl
tricarbonyl (as Mn)
Manganese tetroxide (as
Mn)
Marble
Total dust
Respirable fraction
Mercury (aryl and inorganic)
(as Hg)
Mercury (organo) alkyl
compounds (as Hg)
Mercury (vapor) (as Hg)
Mesityl oxide
Methacrylic acid
Methanethiol; see Methyl
mercaptan
Methomyl (Lannate)
Methoxychlor, total dust
2-Methoxyethanol; see
Methyl cellosolve
4-Methoxyphenol
Methyl acetate
Methyl acetylene (Propyne)
Methyl acetylenepropadiene mixture (MAPP)
Methyl acrylate
Methylacrylonitrile
Methylal (Dimethoxymethane)
Methyl alcohol
Methylamine
Methyl amyl alcohol; see
Methyl isobutyl carbinol
Methyl n-amyl ketone
Methyl bromide
Methyl butyl ketone; see 2Hexanone
Methyl cellosolve (2Methoxyethanol)
Methyl cellosolve acetate (2Methoxyethyl acetate)
Methyl chloride
Methyl chloroform (1,1,1Trichloroethane)
Methyl 2-cyanoacrylate
Methyl cyclohexane
Methylcyclohexanol
o-Methylcyclohexanone
Methylcyclopentadienyl
manganese tricarbonyl (as
Mn)
7439-96-5
12079-65-1
1317-35-7
OSHA Permissible Exposure Limits
TWA
STEL
CEILING
ppm
mg/m3
ppm
mg/m3
ppm mg/m3
(a)
(b)
(a)
(b)
(a)
(b)
1
3
0.1
-
Skin
desig
yes
-
1
-
-
-
-
-
15
5
-
-
-
-
7439-97-6
-
-
-
0.1
yes
7439-97-6
-
0.01
-
0.03
-
-
yes
7439-97-6
141-79-7
79-41-4
74-93-1
15
20
0.05
60
70
25
-
100
-
-
-
yes
yes
16752-77-5
72-43-5
109-86-4
-
2.5
10
-
-
-
-
-
150-76-5
79-20-9
74-99-7
200
1000
1000
5
610
1650
1800
250
1250
760
2250
-
-
-
96-33-3
126-98-7
109-87-5
10
1
1000
35
3
3100
-
-
-
-
yes
yes
-
67-56-1
74-89-5
108-11-2
200
10
260
12
250
-
325
-
-
-
yes
-
110-43-0
74-83-9
591-78-6
100
5
465
20
-
-
-
-
yes
109-86-4
25
80
-
-
-
-
yes
110-49-6
25
120
-
-
-
-
-
74-87-3
71-56-6
50
350
105
1900
100
450
205
2450
-
-
-
137-05-3
108-87-2
25639-42-3
583-60-8
12108-13-3
2
400
50
50
-
8
1600
235
230
0.2
4
75
-
16
345
-
-
-
yes
yes
1317-65-3
PELs from Navy table, reformatted. All footnotes *, (a) – (m) are at last page of this document. p. 13 of 21
Where substance specific standards exist (e.g. acrylonitrile) they are referenced.
Substance
CAS No. (f)
Methyl demeton
4,4'-Methylene bis(2chloroaniline) (MBOCA)
Methylene bis(4-cyclohexylisocyanate)
Methylene chloride; see
1910.1052
Methylenedianiline; see
1910.1050
Methyl ethyl ketone
peroxide (MEKP)
Methyl formate
Methyl hydrazine
(Monomethyl hydrazine)
Methyl iodide
Methyl isoamyl ketone
Methyl isobutyl carbinol
Methyl isobutyl ketone; see
Hexone
Methyl isocyanate
Methyl isopropyl ketone
Methyl mercaptan
Methyl methacrylate
Methyl parathion
Methyl propyl ketone; see 2Pentanone
Methyl silicate
Alpha-Methyl styrene
Methylene bisphenyl
isocyanate (MDI)
Metribuzin
Mica; see Silicates
Molybdenum (as Mo)
Soluble compounds
Insoluble compounds,
total dust
Monocrotophos (Azodrin®)
Monomethyl aniline
Morpholine
Naphtha (Coal tar)
Naphthalene
alpha-Naphthylamine; see
1910.1004
beta-Naphthylamine; see
1910.1009
Nickel carbonyl (as Ni)
Nickel, metal and insoluble
compounds (as Ni)
Nickel, soluble compounds
(as Ni)
Nicotine
Nitric acid
8022-00-2
101-14-4
5124-30-1
OSHA Permissible Exposure Limits
TWA
STEL
CEILING
ppm
mg/m3
ppm
mg/m3
ppm mg/m3
(a)
(b)
(a)
(b)
(a)
(b)
0.5
0.02
0.22
-
Skin
desig
yes
yes
-
-
-
-
0.01
0.11
yes
1338-23-4
-
-
-
-
0.7
5
-
107-31-3
60-34-4
100
-
250
-
150
-
375
-
0.2
0.35
yes
74-88-4
110-12-3
108-11-2
108-10-1
2
50
25
10
240
100
40
165
-
-
yes
yes
624-83-9
563-80-4
74-93-1
80-62-6
298-00-0
107-87-9
0.02
200
0.5
100
-
0.05
705
1
410
0.2
-
-
-
-
yes
yes
681-84-5
98-83-9
101-68-8
1
50
-
6
240
-
100
-
485
-
0.02
0.2
-
-
5
-
-
-
-
-
-
5
10
-
-
-
-
-
0.5
20
100
10
0.25
2
70
400
50
30
15
105
75
-
-
yes
yes
-
13463-39-3
7440-02-0
0.001
-
0.007
1
-
-
-
-
-
7440-02-0
-
0.1
-
-
-
-
-
54-11-5
7697-37-2
2
0.5
5
4
10
-
-
yes
-
75-09-2
101-77-9
21087-64-9
7439-98-7
6923-22-4
100-61-8
110-91-8
8030-30-6
91-20-3
134-32-7
91-59-8
PELs from Navy table, reformatted. All footnotes *, (a) – (m) are at last page of this document. p. 14 of 21
Where substance specific standards exist (e.g. acrylonitrile) they are referenced.
Substance
CAS No. (f)
Nitric oxide
p-Nitroaniline
Nitrobenzene
p-Nitrochlorobenzene
4-Nitrodipheny); see
1910.1003
Nitroethane
Nitrogen dioxide
Nitrogen trifluoride
Nitroglycerin
Nitromethane
1-Nitropropane
2-Nitropropane
N-Nitrosodimethylamine;
see 1910.1016
Nitrotoluene
10102-43-9
100-01-6
98-95-3
100-00-5
92-93-3
Nitrotrichloromethane; see
Chloropicrin
Nonane
Octachloronaphthalene
Octane
Oil mist, mineral
Osmium tetroxide (as Os)
Oxalic acid
Oxygen difluoride
Ozone
Paraffin wax fume
Paraquat, respirable dust
Parathion
Particulates not otherwise
regulated
Total dust
Respirable fraction
Pentaborane
Pentachloronaphthalene
Pentachlorophenol
Pentaerythritol
Total dust
Respirable fraction
Pentane
2-Pentanone (Methyl propyl
ketone)
Perchloroethylene
(Tetrachloroethylene)
Perchloromethyl mercaptan
ppm
(a)
25
1
-
OSHA Permissible Exposure Limits
TWA
STEL
CEILING
mg/m3
ppm
mg/m3
ppm mg/m3
(b)
(a)
(b)
(a)
(b)
30
3
5
1
-
Skin
desig
yes
yes
yes
79-24-3
10102-44-0
7783-54-2
55-63-0
75-52-5
108-03-2
79-46-9
62-75-9
100
10
100
25
10
310
29
250
90
35
1
-
1.8
0.1
-
-
-
yes
-
o-isomer
88-72-2 misomer 9908-1 pisomer 9999-0
76-06-2
2
11
-
-
-
-
yes
111-84-2
2234-13-1
111-65-9
8012-95-1
20816-12-0
144-62-7
7783-41-7
10028-15-6
8002-74-2
1910-42-5
4685-14-7
2074-50-2
56-38-2
200
300
0.0002
0.1
-
1050
0.1
1450
5
0.002
1
0.2
2
0.1
375
0.0006
0.3
-
0.3
1800
0.006
2
0.6
-
0.05
-
0.1
-
yes
-
-
0.1
-
-
-
-
yes
0.005
-
15
5
0.01
0.5
0.5
0.015
-
0.03
-
-
-
yes
yes
109-66-0
107-87-9
600
200
10
5
1800
700
750
250
2250
875
-
-
-
127-18-4
25
170
-
-
-
-
-
594-42-3
0.1
0.8
-
-
-
-
-
19624-22-7
1321-64-8
87-86-5
115-77-5
PELs from Navy table, reformatted. All footnotes *, (a) – (m) are at last page of this document. p. 15 of 21
Where substance specific standards exist (e.g. acrylonitrile) they are referenced.
Substance
CAS No. (f)
Perchloryl fluoride
Perlite
Total dust
Respirable fraction
Petroleum distillates
(Naphtha) (Rubber Solvent)
Phenol
Phenothiazine
p-Phenylene diamine
Phenyl ether, vapor
Phenyl ether-biphenyl
mixture, vapor
Phenylethylene; see Styrene
Phenyl glycidyl ether (PGE)
Phenylhydrazine
Phenyl mercaptan
Phenylphosphine
Phorate
Phosdrin (Mevinphos)
Phosgene (Carbonyl
chloride)
Phosphine
Phosphoric acid
Phosphorus (yellow)
Phosphorus oxychloride
Phosphorus pentachloride
Phosphorus pentasulfide
Phosphorus trichloride
Phthalic anhydride
m-Phthalodinitrile
Picloram
Total dust
Respirable fraction
Picric acid
Piperazine dihydrochloride
Pindone (2-Pivalyl-1,3indandione)
Plaster of Paris
Total dust
Respirable fraction
Platinum (as Pt)
Metal
Soluble salts
Portland cement
Total dust
Respirable fraction
Potassium hydroxide
Propane
Propargyl alcohol
beta-Propriolactone; see
1910.1013
7616-94-6
108-95-2
92-84-2
106-50-3
101-84-8
100-42-5
122-60-1
100-63-0
108-98-5
638-21-1
298-02-2
7786-34-7
75-44-5
7803-51-2
7664-38-2
7723-14-0
10025-87-3
10026-13-8
1314-80-3
7719-12-2
85-44-9
626-17-5
1918-02-1
88-89-1
142-64-3
83-26-1
OSHA Permissible Exposure Limits
TWA
STEL
CEILING
ppm
mg/m3
ppm
mg/m3
ppm mg/m3
(a)
(b)
(a)
(b)
(a)
(b)
3
14
6
28
-
Skin
desig
-
400
15
5
1600
-
-
-
-
-
5
1
1
19
5
0.1
7
7
-
-
-
-
yes
yes
yes
-
1
5
0.5
0.01
0.1
6
20
2
0.05
0.1
0.4
10
0.03
-
45
0.2
0.3
-
0.05
-
0.25
-
yes
yes
yes
-
0.3
0.1
0.2
1
-
0.4
1
0.1
0.6
1
1
1.5
6
5
1
0.5
-
1
3
3
3
-
-
-
-
-
10
5
0.1
5
0.1
-
-
-
-
yes
-
-
15
5
-
-
-
-
-
-
1
0.002
-
-
-
-
-
1000
1
10
5
1800
2
-
-
-
2
-
yes
26499-65-0
7440-06-4
65997-15-1
1310-58-3
74-98-6
107-19-7
57-57-8
PELs from Navy table, reformatted. All footnotes *, (a) – (m) are at last page of this document. p. 16 of 21
Where substance specific standards exist (e.g. acrylonitrile) they are referenced.
Substance
CAS No. (f)
Propionic acid
Propoxur (Baygon)
n-Propyl acetate
n-Propyl alcohol
n-Propyl nitrate
Propylene dichloride
Propylene glycol dinitrate
Propylene glycol
monomethyl ether
Propylene imine
Propylene oxide
Propyne; see Methyl
acetylene
Pyrethrum
Pyridine
Quinone
Resorcinol
Rhodium (as Rh), metal
fume and insoluble
compounds
Rhodium (as Rh), soluble
compounds
Ronnel
Rosin core solder pyrolysis
products, as formaldehyde
Rotenone
Rouge
Total dust
Respirable fraction
Selenium compounds (as Se)
Selenium hexafluoride (as
Se)
Silica, amorphous,
precipitated and gel
Silica, amorphous,
diatomaceous earth,
containing less than 1%
crystalline silica
Silica, crystalline cristobalite
respirable dust
Silica, crystalline, quartz,
respirable dust
Silica, crystalline tripoli as
quartz), respirable dust)
Silica, crystalline tridymite
respirable dust
Silica, fused, respirable dust
Silicates (less than 1%
crystalline silica)
Mica (respirable dust)
Soapstone, total dust
79-09-4
114-26-1
109-60-4
71-23-8
627-13-4
78-87-5
6423-43-4
107-98-2
ppm
(a)
10
200
200
25
75
0.05
100
OSHA Permissible Exposure Limits
TWA
STEL
CEILING
mg/m3
ppm
mg/m3
ppm mg/m3
(b)
(a)
(b)
(a)
(b)
30
0.5
840
250
1050
500
250
625
105
40
170
350
110
510
0.3
360
150
540
-
Skin
desig
-
75-55-8
75-56-9
74-99-7
2
20
5
50
-
-
-
-
yes
-
8003-34-7
110-86-1
106-51-4
108-46-3
7440-16-6
5
0.1
10
-
5
15
0.4
45
0.1
20
-
90
-
-
-
-
7440-16-6
-
0.001
-
-
-
-
-
299-84-3
-
10
0.1
-
-
-
-
-
83-79-4
-
5
-
-
-
-
-
0.05
10
5
0.2
0.4
-
-
-
-
-
112926-008
61790-53-2
-
6
-
-
-
-
-
-
6
-
-
-
-
-
14464-46-1
-
0.05
-
-
-
-
-
14808-60-7
-
0.1
-
-
-
-
-
1317-95-9
-
0.1
-
-
-
-
-
15468-32-3
-
0.05
-
-
-
-
-
60676-86-0
-
0.1
-
-
-
-
-
12001-26-2
-
3
6
-
-
-
-
-
7782-49-2
7783-79-1
PELs from Navy table, reformatted. All footnotes *, (a) – (m) are at last page of this document. p. 17 of 21
Where substance specific standards exist (e.g. acrylonitrile) they are referenced.
Substance
CAS No. (f)
Soapstone, respirable dust
Talc (containing asbestos):
Use asbestos limit; see
1910.1001
Talc (containing no
asbestos), respirable dust
Tremolite; see 1910.1101
Silicon
Total dust
Respirable fraction
Silicon carbide
Total dust
Respirable fraction
Silicon tetrahydride
Silver, metal and soluble
compounds (as Ag)
Soapstone; see Silicates
Sodium azide
(as HN3)
(as NaN3 )
Sodium bisulfite
Sodium fluoroacetate
Sodium hydroxide
Sodium metabisulfite
Starch
Total dust
Respirable fraction
Stibine
Stoddard solvent
Strychnine
Styrene
Subtilisins (Proteolytic
enzymes)
Sucrose
Total dust
Respirable fraction
Sulfur dioxide
Sulfur hexafluoride
Sulfuric acid
Sulfur monochloride
Sulfur pentafluoride
Sulfur tetrafluoride
Sulfuryl fluoride
Sulprofos
Systox®; see Demeton
2,4,5-T
Talc; see Silicates
Tantalum, metal and oxide
dust
TEDP (Sulfotep)
14807-96-6
OSHA Permissible Exposure Limits
TWA
STEL
CEILING
ppm
mg/m3
ppm
mg/m3
ppm mg/m3
(a)
(b)
(a)
(b)
(a)
(b)
3
-
Skin
desig
-
-
2
-
-
-
-
-
-
10
5
-
-
-
-
-
5
-
10
5
7
0.01
-
-
-
-
-
-
5
0.05
5
-
0.15
-
0.1
-
0.3
2
-
yes
yes
yes
-
0.1
100
50
-
15
5
0.5
525
0.15
215
-
100
-
425
-
-
6x10-5
-
2
1000
5
-
15
5
5
6000
1
20
1
5
10
-
13
40
-
1
0.01
0.1
-
6
0.1
0.4
-
-
-
10
-
-
-
-
-
7440-25-7
-
5
-
-
-
-
-
3689-24-5
-
0.2
-
-
-
-
yes
7440-21-3
409-21-2
7803-62-5
7440-22-4
26628-22-8
7631-90-5
62-74-8
1310-73-2
7681-57-4
9005-25-8
7803-52-3
8052-41-3
57-24-9
100-42-5
9014-01-1
57-50-1
7446-09-5
2551-62-4
7664-93-9
10025-67-9
5714-22-7
7783-60-0
2699-79-8
35400-43-2
8065-48-3
93-76-5
PELs from Navy table, reformatted. All footnotes *, (a) – (m) are at last page of this document. p. 18 of 21
Where substance specific standards exist (e.g. acrylonitrile) they are referenced.
Substance
CAS No. (f)
Tellurium and compounds
(as Te)
Tellurium hexafluoride
(as Te)
Temephos
Total dust
Respirable fraction
TEPP
Terphenyls
1,1,1,2-Tetrachloro-2,2difluoroethane
1,1,2,2-Tetrachloro 1,2difluoroethane
1,1,2,2-Tetrachloro ethane
Tetrachoroethylene; see
Perchloroethylene
Tetrachloromethane; see
Carbon tetrachloride
Tetrachloronaphthalene
Tetraethyl lead (as Pb)
Tetrahydrofuran
Tetramethyl lead (as Pb)
Tetramethyl succinonitrile
Tetranitromethane
Tetrasodium pyrophosphate
Tetryl (2,4,6-Trinitrophenyl- methyl-nitramine)
Thallium, soluble
compounds (as Tl)
4,4'-Thiobis (6-tert-Butyl-mcresol)
Total dust
Respirable fraction
Thioglycolic acid
Thionyl chloride
Thiram
Tin, inorganic compounds
(except oxides) (as Sn)
Tin, organic compounds (as
Sn)
Tin oxide (as Sn)
Titanium dioxide, total dust
Toluene
Toluene-2,4-diisocyanate
(TDI)
m-Toluidine
o-Toluidine
p-Toluidine
Toxaphene; see Chlorinated
camphene
Tremolite; see Silicates
Tributyl phosphate
13494-80-9
OSHA Permissible Exposure Limits
TWA
STEL
CEILING
ppm
mg/m3
ppm
mg/m3
ppm mg/m3
(a)
(b)
(a)
(b)
(a)
(b)
0.1
-
7783-80-4
0.02
0.2
-
-
-
-
-
107-49-3
26140-60-3
76-11-9
500
10
5
0.05
4170
-
-
0.5
-
5
-
yes
-
76-12-0
500
4170
-
-
-
-
-
79-34-5
127-18-4
1
7
-
-
-
-
yes
1335-88-2
78-00-2
109-99-9
75-74-1
3333-52-6
509-14-8
7722-88-5
479-45-8
200
0.5
1
-
2
0.075
590
0.075
3
8
5
1.5
250
-
735
-
-
-
yes
yes
yes
yes
yes
7440-28-0
-
0.1
-
-
-
-
yes
68-11-1
7719-09-7
137-26-8
7440-31-5
1
-
10
5
4
5
2
-
-
1
-
5
-
yes
-
7440-31-5
-
0.1
-
-
-
-
yes
7440-31-5
13463-67-7
108-88-3
584-84-9
100
0.005
2
10
375
0.04
150
0.02
560
0.15
-
-
-
108-44-1
95-53-4
106-49-0
2
5
2
9
22
9
-
-
-
-
yes
yes
yes
126-73-8
0.2
2.5
-
-
-
-
-
Skin
desig
-
3383-96-8
56-23-5
96-69-5
PELs from Navy table, reformatted. All footnotes *, (a) – (m) are at last page of this document. p. 19 of 21
Where substance specific standards exist (e.g. acrylonitrile) they are referenced.
Substance
CAS No. (f)
Trichloroacetic acid
1,2,4-Trichlorobenzene
1,1,1-Trichloroethane; see
Methyl chloroform
1,1,2-Trichloroethane
Trichloroethylene
Trichloromethane; see
Chloroform
Trichloronaphthalene
1,2,3-Trichloropropane
1,1,2-Trichloro-1,2,2trifluoroethane
Triethylamine
Trifluorobromomethane
Trimellitic anhydride
Trimethylamine
Trimethyl benzene
Trimethyl phosphite
2,4,6-Trinitrophenyl; see
Picric acid
2,4,6-Trinitrophenylmethyl
nitramine; see Tetryl
2,4,6-Trinitrotoluene (TNT)
Triorthocresyl phosphate
Triphenyl amine
Triphenyl phosphate
Tungsten (as W)
Insoluble compounds
Soluble compounds
Turpentine
Uranium (as U)
Soluble compounds
Insoluble compounds
n-Valeraldehyde
Vanadium
Respirable dust (as V205)
Fume (as V205)
Vegetable oil mist
Total dust
Respirable fraction
Vinyl acetate
Vinyl benzene; see Styrene
Vinyl bromide
Vinyl chloride; see
1910.1017
Vinyl cyanide; see
Acrylonitrile
Vinyl cyclohexene dioxide
Vinylidene chloride (1,1Dichloroethylene)
Vinyl toluene
VM & P Naphtha
76-03-9
120-82-1
71-55-6
79-00-5
79-01-6
67-66-3
OSHA Permissible Exposure Limits
TWA
STEL
CEILING
ppm
mg/m3
ppm
mg/m3
ppm mg/m3
(a)
(b)
(a)
(b)
(a)
(b)
1
7
5
40
Skin
desig
-
10
50
45
270
200
1080
-
-
yes
1321-65-9
96-18-4
76-13-1
10
1000
5
60
7600
1250
9500
-
-
yes
-
121-44-8
75-63-8
552-30-7
75-50-3
25551-13-7
121-45-9
88-89-1
10
1000
0.005
10
25
2
40
6100
0.04
24
125
10
15
15
-
60
36
-
-
-
-
-
0.5
0.1
5
3
-
-
-
-
yes
yes
-
100
5
1
560
-
10
3
-
-
-
-
50
0.05
0.2
175
-
0.6
-
-
-
-
-
0.05
0.05
-
-
-
-
-
10
15
5
30
20
60
-
-
-
5
20
-
-
-
-
-
106-87-6
75-35-4
10
1
60
4
-
-
-
-
yes
-
25013-15-4
8032-32-4
100
300
480
1350
400
1800
-
-
-
479-45-8
118-96-1
78-30-8
603-34-9115-86-67440-33-7
8006-64-2
7440-61-1
110-62-3
1314-62-1
108-05-4
100-42-5
593-60-2
75-01-4
107-13-1
PELs from Navy table, reformatted. All footnotes *, (a) – (m) are at last page of this document. p. 20 of 21
Where substance specific standards exist (e.g. acrylonitrile) they are referenced.
Substance
CAS No. (f)
Warfarin
Welding fumes (total
particulate)*
Wood dust, all soft and hard
woods, except Western red
cedar
Wood dust, western red
cedar
Xylenes (o-, m-, p-isomers)
m-Xylene alpha, alpha'
diamine
Xylidine
Yttrium
Zinc chloride fume
Zinc chromate (as CrO3);
see 1910.1026. If the
exposure limit in 1910.1026
is stayed or is otherwise not
in effect, the exposure limit
is a ceiling of 0.1 mg/m3
Zinc oxide fume
Zinc oxide
Total dust
Respirable fraction
Zinc stearate
Total dust
Respirable fraction
Zirconium compounds
(as Zr)
81-81-2
OSHA Permissible Exposure Limits
TWA
STEL
CEILING
ppm
mg/m3
ppm
mg/m3
ppm mg/m3
(a)
(b)
(a)
(b)
(a)
(b)
0.1
5
-
Skin
desig
-
-
5
-
10
-
-
-
-
2.5
-
-
-
-
-
1330-20-7
1477-55-0
100
-
435
-
150
-
655
-
-
0.1
yes
1300-73-8
7440-65-5
7646-85-7
Varies with
Compound
2
-
10
1
1
-
2
-
-
yes
-
1314-13-2
1314-13-2
-
5
-
10
-
-
-
-
10
5
-
-
-
-
-
-
10
5
5
-
10
-
-
-
557-05-1
7440-67-7
PELs from Navy table, reformatted. All footnotes *, (a) – (m) are at last page of this document. p. 21 of 21
Where substance specific standards exist (e.g. acrylonitrile) they are referenced.
* As determined from breathing-zone air samples.
a. Parts of vapor or gas per million parts of contaminated air by volume at 25°C and 760 torr.
b. Milligrams of substance per cubic meter of air. When a numerical entry for a substance is in the mg/m 3 column
and not in the ppm column, then the number in the mg/m3 column is exact. When numerical entries for a
substance are in both the ppm and mg/m3 columns, then the number in the ppm column is exact and the number
in the m/m3 column may be rounded off.
c. Duration is for 15 minutes, unless otherwise noted.
d. The final benzene standard in 1910.1028 applies to all occupational exposures to benzene except some
subsegments of industry where exposures are consistently under the action level (i.e., distribution and sale of
fuels, sealed containers and pipelines, coke production, oil and gas drilling and production, natural gas
processing, and the percentage exclusion for liquid mixtures); for the excepted subsegments, the benzene limits
in Table Z-2 apply.
e. Exposures under 10,000 ppm to be cited as de minimus.
f. 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 the CAS
numbers for the individual compounds.
g. Compliance with the subtilisins STEL is assessed by sampling with a high volume sampler (600-800 liters per
minute) for at least 60 minutes.
h. The acetone STEL does not apply to the cellulose acetate fiber industry. It is in effect for all other sectors.
i. The TWA PEL of 5 mg/m3 is not in effect as a result of reconsideration. Calcium hydroxide is covered by the
exposure limits for particulates not otherwise regulated of 5 mg/m3 respirable dust and 15 mg/m3 total dust.
j. The TWA PEL of 5 mg/m3 is not in effect as a result of reconsideration. The calcium oxide Transitional Limit
of mg/m3 remains in effect and employee exposures shall be kept below that level pursuant to the methods of
compliance specified in 29 CFR 1910.1000(e).
k. The STEL of 0.1 mg/m3 is not in effect as a result of reconsideration for the industrial sector of civilian
manufacture and distribution of explosives and propellants for civilian use. The skin designation and the
Transitional limits ceiling limit of 1 mg/m3 remains in effect for this sector until completion of the
reconsideration.
l.
The STEL of 0.1 mg/m3 is not in effect as a result of reconsideration for the industrial sector of civilian
manufacture and distribution of explosives and propellants for civilian use. The skin designation and the
Transitional limits ceiling limit of 2 mg/m3 remains in effect for this sector until completion of the
reconsideration.
m. Sampling for the carbon monoxide ceiling shall be averaged over 5 minutes but an instantaneous reading over
1500 ppm shall not be exceeded.