Immediately dangerous to life or health

Pressure-demand supplied-air respirator equipped with a full facepiece in combination with an auxiliary pressure-demand self-contained breathing apparatus - for IDLH conditions in workplace.

Immediately dangerous to life or health (IDLH) is defined by the US National Institute for Occupational Safety and Health (NIOSH) as exposure to airborne contaminants that is "likely to cause death or immediate or delayed permanent adverse health effects or prevent escape from such an environment." Examples include smoke or other poisonous gases at sufficiently high concentrations. It is calculated using the LD50 or LC50.[1] The Occupational Safety and Health Administration (OSHA) regulation (1910.134(b)) defines the term as "an atmosphere that poses an immediate threat to life, would cause irreversible adverse health effects, or would impair an individual's ability to escape from a dangerous atmosphere."[2]

IDLH values are often used to guide the selection of breathing apparatus that are made available to workers or firefighters in specific situations.[1]

The NIOSH definition does not include oxygen deficiency (below 19.5 percent) although atmosphere-supplying breathing apparatus is also required. Examples include high altitudes and unventilated, confined spaces.

The OSHA definition is arguably broad enough to include oxygen-deficient circumstances in the absence of "airborne contaminants", as well as many other chemical, thermal, or pneumatic hazards to life or health (e.g., pure helium, super-cooled or super-heated air, hyperbaric or hypo-baric or submerged chambers, etc.). It also uses the broader term "impair", rather than "prevent", with respect to the ability to escape. For example, blinding but non-toxic smoke could be considered IDLH under the OSHA definition if it would impair the ability to escape a "dangerous" but not life-threatening atmosphere (such as tear gas).

The OSHA definition is part of a legal standard, which is the minimum legal requirement. Users or employers are encouraged to apply proper judgment to avoid taking unnecessary risks, even if the only immediate hazard is "reversible", such as temporary pain, disorientation, nausea, or non-toxic contamination.

Pressure-demand self-contained breathing apparatus with a full facepiece - for IDLH conditions in workplace.

NIOSH respirator selection logic

If the concentration of harmful substances is IDLH, the worker must use the most reliable respirators. Such respirators should not have used cartridges or canister with the sorbent, as their lifetime is too poorly predicted. In addition, the respirator must maintain positive pressure under the mask during inspiration, as this will prevent the leakage of unfiltered air through the gaps (which occur between the edges of the mask and the face sometimes).

Textbook NIOSH[3] recommended for use in IDLH conditions only pressure-demand self-contained breathing apparatus with a full facepiece, or pressure-demand supplied-air respirator equipped with a full facepiece in combination with an auxiliary pressure-demand self-contained breathing apparatus.

IDLH values

The following examples are listed in reference to IDLH values.[4]

IDLH values for several gases and liquids
CAS ICSC mg/m3 ppm
Chlorine | 7782505
100-44-7 0016 Benzyl chloride (used in chemical weapons)[5] 51,8 mg/m3 10 ppm 100447
77-78-1 0148 Dimethyl sulfate (used in chemical weapons)[6] 36,1 mg/m3 7 ppm 77781, carcinogenic substance
76-06-2 0750 Chloropicrin 13,44 mg/m3 2 ppm 76062
75-44-5 0007 Phosgene (used in chemical weapons) 8,1 mg/m3 2 ppm 75445
5714-22-7 - Sulfur pentafluoride (about 4 times as poisonous as phosgene) ~10,4 mg/m3 1 ppm 5714227
505-60-2 0418 Sulfur mustard ~4,7 mg/m3 0.7 ppm 29750008
77-81-6 - Tabun ~0.7 mg/m3 0.1 ppm nerve
77-81-6 - Sarin ~0.6 mg/m3 0.1 ppm nerve
96-64-0 - Soman (Zoman) ~0.4 mg/m3 0.05 ppm nerve
329-99-7 - Cyclosarin ~0.4 mg/m3 0.05 ppm nerve
50782-69-9 51848-47-6 53800-40-1 - VX ~0.034 mg/m3 0.003 ppm nerve
CAS ICSC mg/m3 ppm
75-07-0 0009 Acetaldehyde 3600 mg/m3 2000 ppm 75070
64-19-7 0363 Acetic acid 123 mg/m3 50 ppm 64197
108-24-7 0209 Acetic anhydride 836 mg/m3 200 ppm 108247
67-64-1 0087 Acetone 5900 mg/m3 2500 ppm 67641 (10% Lower explosive limit LEL)
75-05-8 0088 Acetonitrile 840 mg/m3 500 ppm 75058
79-27-6 1235 Acetylene tetrabromide 113,1 mg/m3 8 ppm 79276
107-02-8 0090 Acrolein 4,58 mg/m3 2 ppm 107028
79-06-1 0091 Acrylamide 60 mg/m3 - 79061, carcinogenic substance
107-13-1 0092 Acrylonitrile 184,45 mg/m3 85 ppm 107131
309-00-2 0774 Aldrin 25 mg/m3 - 309002, carcinogenic substance
107-18-6 0095 Allyl alcohol 47,6 mg/m3 20 ppm 107186
107-05-1 0010 Allyl chloride 782,5 mg/m3 250 ppm 107051
106-92-3 0096 Allyl glycidyl ether 233,5 mg/m3 50 ppm 106923
504-29-0 0214 2-Aminopyridine 19,25 mg/m3 5 ppm 504290
7664-41-7 0414 Ammonia 210 mg/m3 300 ppm 7664417
7773-06-0 1555 Ammonium sulfamate 1500 mg/m3 - 7773060
628-63-7 0218 n-Amyl acetate 5330 mg/m3 1000 ppm 628637
626-38-0 0219 sec-Amyl acetate 5330 mg/m3 1000 ppm 626380
62-53-3 0011 Aniline 381 mg/m3 100 ppm 62533, carcinogenic substance
90-04-0 0970 o-Anisidine 50 mg/m3 - 90040
104-94-9 0971 p-Anisidine 50 mg/m3 - 104949
7440-36-0 0775 Antimony 50 mg/m3 - 7440360
86-88-4 0973 ANTU 100 mg/m3 - 86884
7440-38-2 0013 Arsenic 5 mg/m3 - 7440382
7784-42-1 0222 Arsine 9,57 mg/m3 3 ppm 7784421, carcinogenic substance
86-50-0 0826 Azinphos-methyl 10 mg/m3 - 86500
10361-37-2 0614 Barium chloride 50 mg/m3 - 7440393
10022-31-8 1480 Barium nitrate 50 mg/m3 - 7440393
71-43-2 0015 Benzene 1595 mg/m3 500 ppm 71432, carcinogenic substance
94-36-0 0225 Benzoyl peroxide 1500 mg/m3 - 94360
100-44-7 0016 Benzyl chloride 51,8 mg/m3 10 ppm 100447
7440-41-7 0226 Beryllium & beryllium compounds 4 mg/m3 - 7440417
1303-86-2 0836 Boron oxide 2000 mg/m3 - 1303862
7637-07-2 0231 Boron trifluoride 69,3 mg/m3 25 ppm 7637072
7726-95-6 0107 Bromine 19,6 mg/m3 3 ppm 7726956
75-25-2 0108 Bromoform 8789 mg/m3 850 ppm 75252
106-99-0 0017 1,3-Butadiene 4420 mg/m3 2000 ppm 106990, (10% Lower explosive limit LEL); carcinogenic substance
78-93-3 0179 2-Butanone 8850 mg/m3 3000 ppm 78933
111-76-2 0059 2-Butoxyethanol 3381 mg/m3 700 ppm 111762
123-86-4 0399 n-Butyl acetate 8075 mg/m3 1700 ppm 123864, (10% Lower explosive limit LEL)
105-46-4 0840 sec-Butyl acetate 8075 mg/m3 1700 ppm 105464 (10% Lower explosive limit LEL)
540-88-5 1445 tert-Butyl acetate 7125 mg/m3 1500 ppm 540885, (10% Lower explosive limit LEL)
71-36-3 0111 n-Butyl alcohol 4242 mg/m3 1400 ppm 71363
78-92-2 0112 sec-Butyl alcohol 6060 mg/m3 2000 ppm 78922
75-65-0 0114 tert-Butyl alcohol 4848 mg/m3 1600 ppm 75650
109-73-9 0374 n-Butylamine 897 mg/m3 300 ppm 109739
1189-85-1 1533 tert-Butyl chromate 15 mg/m3 - 1189851, carcinogenic substance
2426-08-6 0115 n-Butyl glycidyl ether 1332,5 mg/m3 250 ppm 2426086
109-79-5 0018 n-Butyl mercaptan 1845 mg/m3 500 ppm 109795
98-51-1 1068 p-tert-Butyltoluene 607 mg/m3 100 ppm 98511
7440-43-9 0020 Cadmium dust 9 mg/m3 - 7440439, carcinogenic substance
1306-19-0 0020 Cadmium fume 9 mg/m3 - 7440439, carcinogenic substance
7778-44-1 0765 Calcium arsenate 5 mg/m3 - 7778441, carcinogenic substance
1305-78-8 0409 Calcium oxide 25 mg/m3 - 1305788
76-22-2 1021 Camphor 200 mg/m3 - 76222
63-25-2 0121 Carbaryl 100 mg/m3 - 63252
1333-86-4 0471 Carbon black 1750 mg/m3 - 1333864
124-38-9 0021 Carbon dioxide 72000 mg/m3 40000 ppm 124389
75-15-0 0022 Carbon disulfide 1555 mg/m3 500 ppm 75150
630-08-0 0023 Carbon monoxide 1380 mg/m3 1200 ppm 630080
56-23-5 0024 Carbon tetrachloride 1258 mg/m3 200 ppm 56235, carcinogenic substance
57-74-9 - Chlordane 100 mg/m3 - 57749, carcinogenic substance
8001-35-2 0843 Chlorinated camphene 200 mg/m3 - 8001352, carcinogenic substance
- - Chlorinated diphenyl oxide 5 mg/m3 - 31242930
7782-50-5 0126 Chlorine 29 mg/m3 10 ppm 7782505
10049-04-4 0127 Chlorine dioxide 13,35 mg/m3 5 ppm 10049044
7790-91-2 0656 Chlorine trifluoride 75,6 mg/m3 20 ppm 7790912
107-20-0 0706 Chloroacetaldehyde 144,5 mg/m3 45 ppm 107200
532-27-4 0128 α-Chloroacetophenone 15 mg/m3 - 532274
108-90-7 0642 Chlorobenzene 4610 mg/m3 1000 ppm 108907
2698-41-1 1065 o-Chlorobenzylidene malonitrile 2 mg/m3 - 2698411
74-97-5 0392 Chlorobromomethane 10580 mg/m3 2000 ppm 74975
53469-21-9 0175 Chlorodiphenyl (42% chlorine) 5 mg/m3 - 53469219, carcinogenic substance
11097-69-1 0939 Chlorodiphenyl (54% chlorine) 5 mg/m3 - 53469219, carcinogenic substance
67-66-3 0027 Chloroform 2440 mg/m3 500 ppm 67663, carcinogenic substance
600-25-9 1423 1-Chloro-1-nitropropane 5,06 mg/m3 100 ppm 600259
76-06-2 0750 Chloropicrin 13,44 mg/m3 2 ppm 76062
126-99-8 0133 β-Chloroprene 10,86 mg/m3 300 ppm 126998, carcinogenic substance
1333-82-0 1194 Chromium trioxide 15 mg/m3 - 1333820, carcinogenic substance
- - Chromium(II) 250 mg/m3 - cr2m3
- - Chromium(III) 25 mg/m3 - cr3m3
7440-47-3 0029 Chromium 250 mg/m3 - 7440473
65996-93-2 1415 Coal tar pitch volatiles 80 mg/m3 - 65996932, carcinogenic substance
7440-48-4 0782 Cobalt 20 mg/m3 - 7440484
7440-50-8 0240 Copper 100 mg/m3 - 7440508
- - Cotton dust (raw) 100 mg/m3 - cotdust
136-78-7 1142 Crag® herbicide 500 mg/m3 - 136787
108-39-4 0646 m-Cresol 1107,5 mg/m3 250 ppm cresol
95-48-7 0030 o-Cresol 1107,5 mg/m3 250 ppm cresol
106-44-5 0031 p-Cresol 1107,5 mg/m3 250 ppm cresol
4170-30-3 0241 Crotonaldehyde 143,5 mg/m3 50 ppm 123739
98-82-8 0170 Cumene 4428 mg/m3 900 ppm 98828 (10% Lower explosive limit LEL)
110-82-7 0242 Cyclohexane 4472 mg/m3 1300 ppm 110827
108-93-0 0243 Cyclohexanol 1640 mg/m3 400 ppm 108930
108-94-1 0425 Cyclohexanone 2814 mg/m3 700 ppm 108941
110-83-8 1054 Cyclohexene 6720 mg/m3 2000 ppm 110838
542-92-7 0857 Cyclopentadiene 2025 mg/m3 750 ppm 542927 (10% Lower explosive limit LEL)
13121-70-5 - Cyhexatin 80 mg/m3 (25 mg/m3 - for Sn) - tin-org
94-75-7 0033 2,4-D 100 mg/m3 - 94757
50-29-3 0034 DDT 500 mg/m3 - 50293, carcinogenic substance
17702-41-9 0712 Decaborane 15 mg/m3 - 17702419
8065-48-3 0861 Demeton 10 mg/m3 - 8065483
123-42-2 0647 Diacetone alcohol 8550 mg/m3 1800 ppm 123422
334-88-3 1256 Diazomethane 3,44 mg/m3 2 ppm 334883 (10% Lower explosive limit LEL)
19287-45-7 0432 Diborane 16,95 mg/m3 15 ppm 19287457
107-66-4 1278 Dibutyl phosphate 258 mg/m3 30 ppm 107664
84-74-2 0036 Dibutyl phthalate 4000 mg/m3 - 84742
95-50-1 1066 o-Dichlorobenzene 1202 mg/m3 200 ppm 95501
106-46-7 0037 p-Dichlorobenzene 906 mg/m3 150 ppm 106467, carcinogenic substance
75-71-8 0048 Dichlorodifluoromethane 7425 mg/m3 15000 ppm 75718
118-52-5 - 1,3-Dichloro-5,5-dimethylhydantoin 5 mg/m3 - 118525
75-34-3 0249 1,1-Dichloroethane 12150 mg/m3 3000 ppm 75343
540-59-0 0436 1,2-Dichloroethylene 3970 mg/m3 1000 ppm 540590
111-44-4 0417 Dichloroethyl ether 585 mg/m3 100 ppm 111444, carcinogenic substance
75-43-4 1106 Dichloromonofluoromethane 21050 mg/m3 5000 ppm 75434
594-72-9 0434 Dichloronitroethane 147,3 mg/m3 25 ppm 594729
76-14-2 0649 Dichlorotetrafluoroethane 104850 mg/m3 15000 ppm 76142
62-73-7 0872 Dichlorvos 100 mg/m3 - 62737
60-57-1 0787 Dieldrin 50 mg/m3 - 60571, carcinogenic substance
109-89-7 0444 Diethylamine 5980 mg/m3 200 ppm 109897
100-37-8 0257 2-Diethylaminoethanol 479 mg/m3 100 ppm 100378
75-61-6 1419 Difluorodibromomethane 17160 mg/m3 2000 ppm 75616
2238-07-5 0145 Diglycidyl ether 53,3 mg/m3 10 ppm 2238075, carcinogenic substance
108-83-8 0713 Diisobutyl ketone 2910 mg/m3 500 ppm 108838
108-18-9 0449 Diisopropylamine 828 mg/m3 200 ppm 108189
127-19-5 0259 Dimethyl acetamide 1068 mg/m3 300 ppm 127195
124-40-3 1485 Dimethylamine 925 mg/m3 500 ppm 124403
121-69-7 0877 N,N-Dimethylaniline 4,96 mg/m3 100 ppm 121697
300-76-5 0925 Naled 200 mg/m3 - 300765
68-12-2 0457 Dimethylformamide 1495 mg/m3 500 ppm 68122
57-14-7 0147 1,1-Dimethylhydrazine 371,5 mg/m3 15 ppm 57147, carcinogenic substance
131-11-3 0261 Dimethylphthalate 2000 mg/m3 - 131113
77-78-1 0148 Dimethyl sulfate 36,1 mg/m3 7 ppm 77781, carcinogenic substance
99-65-0 0691 m-Dinitrobenzene 50 mg/m3 - 528290
528-29-0 0460 o-Dinitrobenzene 50 mg/m3 - 528290
100-25-4 0692 p-Dinitrobenzene 50 mg/m3 - 528290
534-52-1 0462 Dinitro-o-cresol 5 mg/m3 - 534521
25321-14-6 0465 Dinitrotoluene 50 mg/m3 - 25321146, carcinogenic substance
117-81-7 0271 Di-sec octyl phthalate 5000 mg/m3 - 117817, carcinogenic substance
123-91-1 0041 Dioxane 1800 mg/m3 500 ppm 123911, carcinogenic substance
92-52-4 0106 Diphenyl 100 mg/m3 - 92524
34590-94-8 0884 Dipropylene glycol methyl ether 3636 mg/m3 600 ppm 34590948
72-20-8 1023 Endrin 2 mg/m3 - 72208
106-89-8 0043 Epichlorohydrin 283,5 mg/m3 75 ppm 106898, carcinogenic substance
2104-64-5 0753 EPN 5 mg/m3 - 2104645
141-43-5 0152 Ethanolamine 75 mg/m3 30 ppm 141435
110-80-5 0060 2-Ethoxyethanol 1845 mg/m3 500 ppm 110805
111-15-9 0364 2-Ethoxyethyl acetate 2705 mg/m3 500 ppm 111159
141-78-6 0367 Ethyl acetate 7200 mg/m3 2000 ppm 141786 (10% Lower explosive limit LEL)
140-88-5 0267 Ethyl acrylate 1227 mg/m3 500 ppm 140885, carcinogenic substance
64-17-5 0044 Ethyl alcohol 6237 mg/m3 3300 ppm 64175 (10% Lower explosive limit LEL)
75-04-7 1482 Ethylamine 1110 mg/m3 600 ppm 75047
100-41-4 0268 Ethyl benzene 3472 mg/m3 800 ppm 100414 (10% Lower explosive limit LEL)
74-96-4 1378 Ethyl bromide 8920 mg/m3 2000 ppm 74964
106-35-4 0889 Ethyl butyl ketone 4670 mg/m3 1000 ppm 106354
75-00-3 0132 Ethyl chloride 10032 mg/m3 3800 ppm 75003 (10% Lower explosive limit LEL)
107-07-3 0236 Ethylene chlorohydrin 23 mg/m3 7 ppm 107073
107-15-3 0269 Ethylenediamine 2460 mg/m3 1000 ppm 107153
106-93-4 0045 Ethylene dibromide 769 mg/m3 100 ppm 106934, carcinogenic substance
107-06-2 0250 Ethylene dichloride 202,5 mg/m3 50 ppm 107062, carcinogenic substance
628-96-6 1056 Ethylene glycol dinitrate 75 mg/m3 - 628966
151-56-4 0100 Ethyleneimine 176 mg/m3 100 ppm 151564, carcinogenic substance
75-21-8 0155 Ethylene oxide 1440 mg/m3 800 ppm html, carcinogenic substance
60-29-7 0355 Ethyl ether 5757 mg/m3 1900 ppm 60297 (10% Lower explosive limit LEL)
109-94-4 0623 Ethyl formate 4545 mg/m3 1500 ppm 109944
75-08-1 0470 Ethyl mercaptan 1270 mg/m3 500 ppm 75081
100-74-3 0480 N-Ethylmorpholine 471 mg/m3 100 ppm 100743
78-10-4 0333 Ethyl silicate 5964 mg/m3 700 ppm 78104
14484-64-1 0792 Ferbam 800 mg/m3 - 14484641
12604-58-9 - Ferrovanadium dust 500 mg/m3 - 12604589
7782-41-4 0046 Fluorine 38,8 mg/m3 25 ppm 7782414
75-69-4 0047 Fluorotrichloromethane 11240 mg/m3 2000 ppm 75694
50-00-0 0695 Formaldehyde 24,6 mg/m3 20 ppm 50000, carcinogenic substance
- 0695 Formalin 24,6 mg/m3 20 ppm 50000, carcinogenic substance
64-18-6 0485 Formic acid 56,4 mg/m3 30 ppm 64186
98-01-1 0276 Furfural 393 mg/m3 100 ppm 98011
98-00-0 0794 Furfuryl alcohol 300,8 mg/m3 75 ppm 98000
556-52-5 0159 Glycidol 454,5 mg/m3 150 ppm 556525
7782-42-5 0893 Graphite (natural) 1250 mg/m3 - 7782425
7440-58-6 0847 Hafnium 50 mg/m3 - 7440586
76-44-8 0743 Heptachlor 35 mg/m3 - 76448, carcinogenic substance
142-82-5 0657 n-Heptane 3075 mg/m3 750 ppm 142825
67-72-1 0051 Hexachloroethane 2904 mg/m3 300 ppm 67721, carcinogenic substance
1335-87-1 0997 Hexachloronaphthalene 2 mg/m3 - 1335871
110-54-3 0279 n-Hexane 3883 mg/m3 1100 ppm 110543 (10% Lower explosive limit LEL)
591-78-6 0489 2-Hexanone 6560 mg/m3 1600 ppm 591786
108-10-1 0511 Hexone 2050 mg/m3 500 ppm 108101
108-84-9 1335 sec-Hexyl acetate 2950 mg/m3 500 ppm 108849
302-01-2 0281 Hydrazine 65,5 mg/m3 50 ppm 302012, carcinogenic substance
10035-10-6 0282 Hydrogen bromide 99,3 mg/m3 30 ppm 10035106
7647-01-0 0163 Hydrogen chloride 74,5 mg/m3 50 ppm 7647010
74-90-8 0492 Hydrogen cyanide 55 mg/m3 50 ppm 74908
7664-39-3 0283 Hydrogen fluoride 24,6 mg/m3 30 ppm 7664393
7722-84-1 - Hydrogen peroxide 104 mg/m3 75 ppm 772841
7783-07-5 0284 Hydrogen selenide 3,3 mg/m3 1 ppm 7783075
7783-06-4 0165 Hydrogen sulfide 140 mg/m3 100 ppm 7783064
123-31-9 0166 Hydroquinone 50 mg/m3 - 123319
7553-56-2 0167 Iodine 20,76 mg/m3 2 ppm 7553562
1309-37-1 1577 Iron(III) oxide 2500 mg/m3 - 1309371
123-92-2 0356 Isoamyl acetate 5330 mg/m3 1000 ppm 123922
123-51-3 0798 Isoamyl alcohol (primary) 1805 mg/m3 500 ppm 123513
6032-29-7 - Isoamyl alcohol (secondary) 1805 mg/m3 500 ppm 123513
110-19-0 0494 Isobutyl acetate 6175 mg/m3 1300 ppm 110190 (10% Lower explosive limit LEL)
78-83-1 0113 Isobutyl alcohol 4848 mg/m3 1600 ppm 78831
78-59-1 0169 Isophorone 1130 mg/m3 200 ppm 78591
108-21-4 0907 Isopropyl acetate 7524 mg/m3 1800 ppm 108214
67-63-0 0554 Isopropyl alcohol 4920 mg/m3 2000 ppm 67630 (10% Lower explosive limit LEL)
75-31-0 0908 Isopropylamine 1815 mg/m3 750 ppm 75310
108-20-3 0906 Isopropyl ether 5852 mg/m3 1400 ppm 108203 (10% Lower explosive limit LEL)
4016-14-2 0171 Isopropyl glycidyl ether 1900 mg/m3 400 ppm 4016142
463-51-4 0812 Ketene 8,6 mg/m3 5 ppm 463514
7439-92-1 0052 Lead 100 mg/m3 - 7439921
58-89-9 0053 Lindane 50 mg/m3 - 58899
7580-67-8 0813 Lithium hydride 0,5 mg/m3 - 7580678
68476-85-7 - L.P.G. 3440-4740 mg/m3 2000 ppm 68476857 (10% Lower explosive limit LEL)
1309-48-4 0504 Magnesium oxide fume 750 mg/m3 - 1309484
121-75-5 0172 Malathion 250 mg/m3 - 121755
108-31-6 0799 Maleic anhydride 10 mg/m3 - 108316
7439-96-5 0174 Manganese 500 mg/m3 - 7439965
7439-97-6 0056 Mercury 10 mg/m3 - 7439976
- 1304 Mercury (organo) alkyl compounds 2 mg/m3 - merc-hg
141-79-7 0814 Mesityl oxide 5628 mg/m3 1400 ppm 141797 (10% Lower explosive limit LEL)
72-43-5 1306 Methoxychlor 5000 mg/m3 - 72435, carcinogenic substance
79-20-9 0507 Methyl acetate 9393 mg/m3 3100 ppm 79209 (10% Lower explosive limit LEL)
74-99-7 0560 Methyl acetylene 2788 mg/m3 1700 ppm 74997 (10% Lower explosive limit LEL)
59355-75-8 - Methyl acetylene-propadiene mixture 5576 mg/m3 3400 ppm 59355758 (10% Lower explosive limit LEL)
96-33-3 0625 Methyl acrylate 880 mg/m3 250 ppm 96333
109-87-5 1152 Methylal 6842 mg/m3 2200 ppm 109875 (10% Lower explosive limit LEL)
67-56-1 0057 Methyl alcohol 7860 mg/m3 6000 ppm 67561
74-89-5 1483 Methylamine 127 mg/m3 100 ppm 74895
110-43-0 0920 Methyl (n-amyl) ketone 3736 mg/m3 800 ppm 110430
74-83-9 0109 Methyl bromide 972 mg/m3 250 ppm 74839, carcinogenic substance
109-86-4 0061 Methyl Cellosolve 622 mg/m3 200 ppm 109864
110-49-6 0476 Methyl Cellosolve acetate 966 mg/m3 200 ppm 110496
74-87-3 0419 Methyl chloride 4140 mg/m3 2000 ppm 74873, carcinogenic substance
71-55-6 0079 Methyl chloroform 3822 mg/m3 700 ppm 71556
108-87-2 0923 Methylcyclohexane 4824 mg/m3 1200 ppm 108872 (10% Lower explosive limit LEL)
25639-42-3 0292 Methylcyclohexanol 2335 mg/m3 500 ppm 25639423
583-60-8 - 2-Methylcyclohexanone 2754 mg/m3 600 ppm 583608
101-68-8 0298 Methylene bisphenyl isocyanate 75 mg/m3 - 101688
75-09-2 0058 Methylene chloride 7981 mg/m3 2300 ppm 75092, carcinogenic substance
107-31-3 0664 Methyl formate 11070 mg/m3 4500 ppm 107313
541-85-5 1391 5-Methyl-3-heptanone 524 mg/m3 100 ppm 541855
60-34-4 0180 Methyl hydrazine 37,8 mg/m3 20 ppm 60344, carcinogenic substance
74-88-4 0509 Methyl iodide 580 mg/m3 100 ppm 74884, carcinogenic substance
108-11-2 0665 Methyl isobutyl carbinol 1672 mg/m3 400 ppm 108112
624-83-9 0004 Methyl isocyanate 7 mg/m3 3 ppm 624839
74-93-1 0299 Methyl mercaptan 295,5 mg/m3 150 ppm 74931
80-62-6 0300 Methyl methacrylate 4090 mg/m3 1000 ppm 80626
98-83-9 0732 alpha-Methylstyrene 3381 mg/m3 700 ppm 98839
12001-26-2 - Mica 1500 mg/m3 - 12001262
7439-98-7 1003 Molybdenum 5000 mg/m3 - 7439987
- 1003 Molybdenum, soluble compounds 1000 mg/m3 - moly-mo
100-61-8 0921 Monomethyl aniline 438 mg/m3 100 ppm 100618
110-91-8 0302 Morpholine 1400 mg/m3 4984 ppm 110918 (10% Lower explosive limit LEL)
8030-30-6 - Naphtha (coal tar) 4500 mg/m3 1000 ppm 8030306 (10% Lower explosive limit LEL)
91-20-3 0667 Naphthalene 1310 mg/m3 250 ppm 91203
13463-39-3 0064 Nickel carbonyl 14 mg/m3 2 ppm 13463393, carcinogenic substance
7440-02-0 0062 Nickel 10 mg/m3 - 7440020, carcinogenic substance
54-11-5 0519 Nicotine 5 mg/m3 - 54115
7697-37-2 0183 Nitric acid 64,5 mg/m3 25 ppm 7697372
10102-43-9 1311 Nitric oxide 123 mg/m3 100 ppm 10102439
100-01-6 0308 p-Nitroaniline 300 mg/m3 - 100016
98-95-3 0065 Nitrobenzene 1008 mg/m3 200 ppm 98953
100-00-5 0846 p-Nitrochlorobenzene 100 mg/m3 - 100005
79-24-3 0817 Nitroethane 3070 mg/m3 1000 ppm 79243
10102-44-0 0930 Nitrogen dioxide 37,6 mg/m3 20 ppm 10102440
7783-54-2 1234 Nitrogen trifluoride 2900 mg/m3 2000 ppm 7783542
55-63-0 0186 Nitroglycerine 75 mg/m3 - 55630
75-52-5 0522 Nitromethane 1875 mg/m3 750 ppm 75525
108-03-2 1050 1-Nitropropane 3640 mg/m3 1000 ppm 108032
79-46-9 0187 2-Nitropropane 354 mg/m3 100 ppm 79469, carcinogenic substance
99-08-1 1411 m-Nitrotoluene 1122 mg/m3 200 ppm 88722
88-72-2 0931 o-Nitrotoluene 1122 mg/m3 200 ppm 88722
99-99-0 0932 p-Nitrotoluene 1122 mg/m3 200 ppm 88722
2234-13-1 1059 Octachloronaphthalene ~1 mg/m3 - 2234131
111-65-9 0933 Octane 4670 mg/m3 1000 ppm 111659 (10% Lower explosive limit LEL)
8012-95-1 - Oil mist (mineral) 2500 mg/m3 - 8012951
20816-12-0 0528 Osmium tetroxide 1 mg/m3 - 20816120
7783-41-7 0818 Oxygen difluoride 1,1 mg/m3 0,5 ppm 7783417
10028-15-6 0068 Ozone 9,8 mg/m3 5 ppm 10028156
1910-42-5 0005 Paraquat 1 mg/m3 - 1910425
56-38-2 0006 Parathion 10 mg/m3 - 56382
19624-22-7 0819 Pentaborane 2,6 mg/m3 1 ppm 19624227
87-86-5 0069 Pentachlorophenol 2,5 mg/m3 - 87865
109-66-0 0534 n-Pentane 4425 mg/m3 1500 ppm 109660 (10% Lower explosive limit LEL)
107-87-9 0816 2-Pentanone 5280 mg/m3 1500 ppm 107879
594-42-3 0311 Perchloromethyl mercaptan 10 mg/m3 76 ppm 594423
7616-94-6 1114 Perchloryl fluoride 419 mg/m3 100 ppm 7616946
8002-05-9 Petroleum distillates (naphtha) 4455 mg/m3 1100 ppm 8002059 (10% Lower explosive limit LEL)
108-95-2 0070 Phenol 962 mg/m3 250 ppm 108952
106-50-3 0805 p-Phenylene diamine 25 mg/m3 - 106503
101-84-8 0791 Phenyl ether 100 mg/m3 696 ppm 101848
122-60-1 0188 Phenyl glycidyl ether 614 mg/m3 100 ppm 122601, carcinogenic substance
100-63-0 0938 Phenylhydrazine 66,3 mg/m3 15 ppm 100630, carcinogenic substance
7786-34-7 0924 Phosdrin 36,7 mg/m3 4 ppm 7786347
75-44-5 0007 Phosgene 8,1 mg/m3 2 ppm 75445
7803-51-2 0694 Phosphine 69,5 mg/m3 50 ppm 7803512
7664-38-2 1008 Phosphoric acid 1000 mg/m3 - 7664382
7723-14-0 0628 Phosphorus (yellow) 5 mg/m3 - 7723140.html 7723140
10026-13-8 0544 Phosphorus pentachloride 70 mg/m3 - 10026138
1314-80-3 1407 Phosphorus pentasulfide 250 mg/m3 - 1314803
7719-12-2 0696 Phosphorus trichloride 140 mg/m3 25 ppm 7719122
85-44-9 0315 Phthalic anhydride 60 mg/m3 - 85449
88-89-1 0316 Picric acid 75 mg/m3 - 88891
83-26-1 1515 Pindone 100 mg/m3 - 83261
- - Platinum (soluble salts, as Pt) 4 mg/m3 - platinum
65997-15-1 1425 Portland cement 5000 mg/m3 - 65997151
151-50-8 0671 Potassium cyanide 25 mg/m3 - cyanides
74-98-6 0319 Propane 3780 mg/m3 2100 ppm 74986 (10% Lower explosive limit LEL)
109-60-4 0940 n-Propyl acetate 7106 mg/m3 1700 ppm 109604
71-23-8 0553 n-Propyl alcohol 1968 mg/m3 800 ppm 71238
78-87-5 0441 Propylene dichloride 1848 mg/m3 400 ppm 78875, carcinogenic substance
75-55-8 0322 Propylene imine 234 mg/m3 100 ppm 75558, carcinogenic substance
75-56-9 0192 Propylene oxide 952 mg/m3 400 ppm 75569, carcinogenic substance
627-13-4 1513 n-Propyl nitrate 2150 mg/m3 500 ppm 627134
8003-34-7 1475 Pyrethrum 5000 mg/m3 - 8003347
110-86-1 0323 Pyridine 3240 mg/m3 1000 ppm 110861
106-51-4 0779 Quinone 100 mg/m3 - 106514
7440-16-6 1247 Rhodium (metal fume and insoluble compounds, as Rh) 100 mg/m3 - rhodium
- - Rhodium (soluble compounds, as Rh) 2 mg/m3 - rhodium
299-84-3 0975 Ronnel 300 mg/m3 - 299843
83-79-4 0944 Rotenone 2500 mg/m3 - 83794
7782-49-2 0072 Selenium 1 mg/m3 - 7782492
7783-79-1 0947 Selenium hexafluoride 15,8 mg/m3 2 ppm 7783791
7631-86-9 - Silica, amorphous 3000 mg/m3 - 7631869
14808-60-7 0808 Silica, crystalline 25/50 mg/m3 - 14808607, carcinogenic substance (25 mg/m3 – cristobalite, tridymite; 50 mg/m3 – crystalline silica)
7440-22-4 0810 Silver 10 mg/m3 - 7440224
- - Soapstone (containing less than 1% quartz) 3000 mg/m3 - soapston
15096-52-3 1565 Sodium aluminum fluoride 250 mg/m3 - fluoride
143-33-9 1118 Sodium cyanide 25 mg/m3 - cyanides
7681-49-4 0951 Sodium fluoride 250 mg/m3 - fluoride
62-74-8 0484 Sodium fluoroacetate 2,5 mg/m3 - 62748
1310-73-2 0360 Sodium hydroxide 10 mg/m3 - 1310732
7803-52-3 0776 Stibine 25,5 mg/m3 5 ppm 7803523
8052-41-3 0361 Stoddard solvent 20 000 mg/m3 - 8052413
57-24-9 0197 Strychnine 3 mg/m3 - 57249
100-42-5 0073 Styrene 2982 mg/m3 700 ppm 100425
7446-09-5 0074 Sulfur dioxide 262 mg/m3 100 ppm 7446095
7664-93-9 0362 Sulfuric acid 15 mg/m3 - 7664939
10025-67-9 0958 Sulfur monochloride 27,6 mg/m3 5 ppm 10025679
5714-22-7 - Sulfur pentafluoride 10,4 mg/m3 1 ppm 5714227
2699-79-8 1402 Sulfuryl fluoride 836 mg/m3 200 ppm 2699798
93-76-5 0075 2,4,5-Trichlorophenoxyacetic acid 250 mg/m3 - 93765
14807-96-6 0329 Talc 1000 mg/m3 - 14807966
7440-25-7 1596 Tantalum 2500 mg/m3 - 7440257
3689-24-5 0985 TEDP 10 mg/m3 - 3689245
13494-80-9 0986 Tellurium 25 mg/m3 - 13494809
7783-80-4 - Tellurium hexafluoride 9,9 mg/m3 1 ppm 7783804
107-49-3 1158 TEPP 5 mg/m3 - 107493
92-06-8 - m-Terphenyl 500 mg/m3 - 26140603
84-15-1 1525 o-Terphenyl 500 mg/m3 - 26140603
92-94-4 - p-Terphenyl 500 mg/m3 - 26140603
76-11-9 1420 1,1,1,2-Tetrachloro-2,2-difluoroethane 16680 mg/m3 2000 ppm 76119
76-12-0 1421 Freon 112 16680 mg/m3 2000 ppm 76120
79-34-5 0332 1,1,2,2-Tetrachloroethane 687 mg/m3 100 ppm 79345, carcinogenic substance
127-18-4 0076 Tetrachloroethylene 1017 mg/m3 150 ppm 127184, carcinogenic substance
78-00-2 0008 Tetraethyl lead 40 mg/m3 - 78002
109-99-9 0578 Tetrahydrofuran 5900 mg/m3 2000 ppm 109999 (10% Lower explosive limit LEL)
75-74-1 0200 Tetramethyl lead 40 mg/m3 - 75741
3333-52-6 1121 Tetramethyl succinonitrile 27,9 mg/m3 5 ppm 3333526
509-14-8 1468 Tetranitromethane 32 mg/m3 4 ppm 509148
479-45-8 0959 Tetryl 750 mg/m3 - 479458
- - Thallium (soluble compounds) 15 mg/m3 - thallium
137-26-8 0757 Thiram 100 mg/m3 - 137268
7440-31-5 1535 Tin 100 mg/m3 - 7440315
- - Tin (organic compounds) 25 mg/m3 - tin-org
13463-67-7 0338 Titanium dioxide 5000 mg/m3 - 13463677, carcinogenic substance
108-88-3 0078 Toluene 1885 mg/m3 500 ppm 108883
584-84-9 0339 Toluene-2,4-diisocyanate 17,8 mg/m3 2,5 ppm 584849, carcinogenic substance
95-53-4 0341 o-Toluidine 219 mg/m3 50 ppm 95534, carcinogenic substance
126-73-8 0584 Tributyl phosphate 327 mg/m3 30 ppm 126738
79-00-5 0080 1,1,2-Trichloroethane 546 mg/m3 100 ppm 79005, carcinogenic substance
79-01-6 0081 Trichloroethylene 5370 mg/m3 1000 ppm 79016, carcinogenic substance
96-18-4 0683 1,2,3-Trichloropropane 603 mg/m3 100 ppm 96184, carcinogenic substance
76-13-1 0050 1,1,2-Trichloro-1,2,2-trifluoroethane 15340 mg/m3 2000 ppm 76131
121-44-8 0203 Triethylamine 828 mg/m3 200 ppm 121448
75-63-8 0837 Trifluorobromomethane 243 600 mg/m3 40 000 ppm 75638
118-96-7 0967 2,4,6-Trinitrotoluene 500 mg/m3 - 118967
78-30-8 0961 Triorthocresyl phosphate 40 mg/m3 - 78308
115-86-6 1062 Triphenyl phosphate 1000 mg/m3 - 115866
8006-64-2 1063 Turpentine 4448 mg/m3 8000 ppm 8006642
7440-61-1 1251 Uranium (insoluble compounds) 10 mg/m3 - 7440611, carcinogenic substance
- - Uranium (soluble compounds) 10 mg/m3 - uranium, carcinogenic substance
7440-62-2 - Vanadium dust 35 mg/m3 - vandust
1314-62-1 - Vanadium fume 35 mg/m3 - vanfume
25013-15-4 0514 Vinyl toluene 1932 mg/m3 400 ppm 25013154
81-81-2 0821 Warfarin 100 mg/m3 - 81812
108-38-3 0085 m-Xylene 3906 mg/m3 900 ppm 95476
95-47-6 0084 o-Xylene 3906 mg/m3 900 ppm 95476
106-42-3 0086 p-Xylene 3906 mg/m3 900 ppm 95476
1300-73-8 0600 Xylidine 248 mg/m3 50 ppm 1300738
7440-65-5 - Yttrium 500 mg/m3 - 7440655
7646-85-7 1064 Zinc chloride fume 50 mg/m3 - 7646857
1314-13-2 0208 Zinc oxide 500 mg/m3 - 1314132
7440-67-7 1405 Zirconium compounds 25 mg/m3 - 7440677

References

  1. 1 2 "Immediately Dangerous To Life or Health (IDLH) Introduction". NIOSH. December 4, 2014.
  2. ↑ "Occupational Safety and Health Standards". Occupational Safety & Health Administration. Retrieved 7 July 2012.
  3. ↑ Bollinger, Nancy; et al. (1987). NIOSH Respirator Selecion Logic. DHHS (NIOSH) Publication No. 87-108. Cincinnati, Ohio: National Institute for Occupational Safety and Health. p. 32.
  4. ↑ "Chemical Listing and Documentation of Revised IDLH Values". NIOSH Publications and Products. Centers for Disease Control and Prevention. Retrieved 7 July 2012.
  5. ↑ http://www.epa.gov/ttn/atw/hlthef/benzylch.html
  6. ↑ http://www.epa.gov/ttn/atw/hlthef/di-sulfa.html

External links

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