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Immediately dangerous to life or health

January 01, 1970

The term 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]

Personal protective equipment for IDLH conditions: pressure-demand supplied-air respirator equipped with a full facepiece in combination with an auxiliary pressure-demand self-contained breathing apparatus

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%) although atmosphere-supplying breathing apparatus is also required.[3] 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.

NIOSH respirator selection logic edit

 
Personal protective equipment for IDLH conditions: pressure-demand self-contained breathing apparatus with a full facepiece

If the concentration of harmful substances is IDLH, the worker must use the most reliable respirators. Such respirators should not use 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[4] 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 edit

The following examples are listed in reference to IDLH values.[3]

Legend:[5]

Ca
NIOSH considers this substance to be a potential occupational carcinogen. Revised values may follow in parentheses.
N.D.
Not determined. That is, the level is unknown, not non-existent.
10%LEL
The IDLH value has been set at 10% of the lower explosive limit although other irreversible health effects or impairment of escape due to toxicology exist only at higher levels.

See also edit

References edit

  1. ^ a b "Immediately Dangerous To Life or Health (IDLH) Introduction". NIOSH. 4 December 2014. from the original on 18 September 2017.
  2. ^ "Occupational Safety and Health Standards". Occupational Safety & Health Administration. from the original on 9 July 2012. Retrieved 7 July 2012.
  3. ^ a b "Chemical Listing and Documentation of Revised IDLH Values". NIOSH Publications and Products. Centers for Disease Control and Prevention. from the original on 17 November 2012. Retrieved 7 July 2012.
  4. ^ Bollinger, Nancy; et al. (1987). NIOSH Respirator Selecion Logic. DHHS (NIOSH) Publication No. 87-108. Cincinnati, OH: National Institute for Occupational Safety and Health. p. 32. doi:10.26616/NIOSHPUB2005100. from the original on 23 June 2017.
  5. ^ "CDC - NIOSH Pocket Guide to Chemical Hazards (NPG) Introduction". www.cdc.gov. 2 December 2019. from the original on 10 December 2017.
  6. ^ "Benzyl Chloride | Technology Transfer Network Air Toxics Web site | US EPA". from the original on 2014-07-12. Retrieved 2014-08-17.
  7. ^ "Dimethyl Sulfate | Technology Transfer Network Air Toxics Web site | US EPA". from the original on 2012-05-11. Retrieved 2012-05-03.

External links edit

  • NIOSH IDLH site
  • 1910.134(b) Respiratory protection definitions

January 01, 1970
immediately, dangerous, life, health, term, immediately, dangerous, life, health, idlh, defined, national, institute, occupational, safety, health, niosh, exposure, airborne, contaminants, that, likely, cause, death, immediate, delayed, permanent, adverse, hea. The term 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 Personal protective equipment for IDLH conditions pressure demand supplied air respirator equipped with a full facepiece in combination with an auxiliary pressure demand self contained breathing apparatus 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 although atmosphere supplying breathing apparatus is also required 3 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 Contents 1 NIOSH respirator selection logic 2 IDLH values 3 See also 4 References 5 External linksNIOSH respirator selection logic edit nbsp Personal protective equipment for IDLH conditions pressure demand self contained breathing apparatus with a full facepiece If the concentration of harmful substances is IDLH the worker must use the most reliable respirators Such respirators should not use 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 4 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 editThe following examples are listed in reference to IDLH values 3 Legend 5 Ca NIOSH considers this substance to be a potential occupational carcinogen Revised values may follow in parentheses N D Not determined That is the level is unknown not non existent 10 LEL The IDLH value has been set at 10 of the lower explosive limit although other irreversible health effects or impairment of escape due to toxicology exist only at higher levels IDLH values for gases and vapors used in industry Number Substance IDLH value Source CAS ICSC mg m3 ppm 75 07 0 0009 Acetaldehyde 3600 mg m3 2000 ppm 75070 Archived 2015 10 02 at the Wayback Machine 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 Archived 2015 10 02 at the Wayback Machine 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 Archived 2015 10 02 at the Wayback Machine 10022 31 8 1480 Barium nitrate 50 mg m3 7440393 Archived 2015 10 02 at the Wayback Machine 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 amp 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 0740 Chlordane 100 mg m3 57749 carcinogenic substance 8001 35 2 0843 Chlorinated camphene 200 mg m3 8001352 carcinogenic substance 31242 93 0 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 a 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 b 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 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 1 permanent dead link 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 IDLH values for several gases and vapors military Number Substance IDLH value Source CAS ICSC mg m3 ppm 7782 50 5 0126 Chlorine 29 mg m3 10 ppm 7782505 100 44 7 0016 Benzyl chloride used in chemical weapons 6 51 8 mg m3 10 ppm 100447 77 78 1 0148 Dimethyl sulfate used in chemical weapons 7 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 nerveSee also editNIOSH air filtration ratingReferences edit a b Immediately Dangerous To Life or Health IDLH Introduction NIOSH 4 December 2014 Archived from the original on 18 September 2017 Occupational Safety and Health Standards Occupational Safety amp Health Administration Archived from the original on 9 July 2012 Retrieved 7 July 2012 a b Chemical Listing and Documentation of Revised IDLH Values NIOSH Publications and Products Centers for Disease Control and Prevention Archived from the original on 17 November 2012 Retrieved 7 July 2012 Bollinger Nancy et al 1987 NIOSH Respirator Selecion Logic DHHS NIOSH Publication No 87 108 Cincinnati OH National Institute for Occupational Safety and Health p 32 doi 10 26616 NIOSHPUB2005100 Archived from the original on 23 June 2017 CDC NIOSH Pocket Guide to Chemical Hazards NPG Introduction www cdc gov 2 December 2019 Archived from the original on 10 December 2017 Benzyl Chloride Technology Transfer Network Air Toxics Web site US EPA Archived from the original on 2014 07 12 Retrieved 2014 08 17 Dimethyl Sulfate Technology Transfer Network Air Toxics Web site US EPA Archived from the original on 2012 05 11 Retrieved 2012 05 03 External links editNIOSH IDLH site 1910 134 b Respiratory protection definitions Retrieved from https en wikipedia org w index php title Immediately dangerous to life or health amp oldid 1194680330, wikipedia, wiki, book, books, library,

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