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Immediately dangerous to life or health

February 15, 2024

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

February 15, 2024
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 apparatusIDLH 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 facepieceIf 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 industryNumber Substance IDLH value SourceCAS ICSC mg m3 ppm75 07 0 0009 Acetaldehyde 3600 mg m3 2000 ppm 75070 Archived 2015 10 02 at the Wayback Machine64 19 7 0363 Acetic acid 123 mg m3 50 ppm 64197108 24 7 0209 Acetic anhydride 836 mg m3 200 ppm 10824767 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 Machine79 27 6 1235 Acetylene tetrabromide 113 1 mg m3 8 ppm 79276107 02 8 0090 Acrolein 4 58 mg m3 2 ppm 10702879 06 1 0091 Acrylamide 60 mg m3 79061 carcinogenic substance107 13 1 0092 Acrylonitrile 184 45 mg m3 85 ppm 107131309 00 2 0774 Aldrin 25 mg m3 309002 carcinogenic substance107 18 6 0095 Allyl alcohol 47 6 mg m3 20 ppm 107186107 05 1 0010 Allyl chloride 782 5 mg m3 250 ppm 107051106 92 3 0096 Allyl glycidyl ether 233 5 mg m3 50 ppm 106923504 29 0 0214 2 Aminopyridine 19 25 mg m3 5 ppm 5042907664 41 7 0414 Ammonia 210 mg m3 300 ppm 76644177773 06 0 1555 Ammonium sulfamate 1500 mg m3 7773060628 63 7 0218 n Amyl acetate 5330 mg m3 1000 ppm 628637626 38 0 0219 sec Amyl acetate 5330 mg m3 1000 ppm 62638062 53 3 0011 Aniline 381 mg m3 100 ppm 62533 carcinogenic substance90 04 0 0970 o Anisidine 50 mg m3 90040104 94 9 0971 p Anisidine 50 mg m3 1049497440 36 0 0775 Antimony 50 mg m3 744036086 88 4 0973 ANTU 100 mg m3 868847440 38 2 0013 Arsenic 5 mg m3 74403827784 42 1 0222 Arsine 9 57 mg m3 3 ppm 7784421 carcinogenic substance86 50 0 0826 Azinphos methyl 10 mg m3 8650010361 37 2 0614 Barium chloride 50 mg m3 7440393 Archived 2015 10 02 at the Wayback Machine10022 31 8 1480 Barium nitrate 50 mg m3 7440393 Archived 2015 10 02 at the Wayback Machine71 43 2 0015 Benzene 1595 mg m3 500 ppm 71432 carcinogenic substance94 36 0 0225 Benzoyl peroxide 1500 mg m3 94360100 44 7 0016 Benzyl chloride 51 8 mg m3 10 ppm 1004477440 41 7 0226 Beryllium amp beryllium compounds 4 mg m3 74404171303 86 2 0836 Boron oxide 2000 mg m3 13038627637 07 2 0231 Boron trifluoride 69 3 mg m3 25 ppm 76370727726 95 6 0107 Bromine 19 6 mg m3 3 ppm 772695675 25 2 0108 Bromoform 8789 mg m3 850 ppm 75252106 99 0 0017 1 3 Butadiene 4420 mg m3 2000 ppm 106990 10 Lower explosive limit LEL carcinogenic substance78 93 3 0179 2 Butanone 8850 mg m3 3000 ppm 78933111 76 2 0059 2 Butoxyethanol 3381 mg m3 700 ppm 111762123 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 7136378 92 2 0112 sec Butyl alcohol 6060 mg m3 2000 ppm 7892275 65 0 0114 tert Butyl alcohol 4848 mg m3 1600 ppm 75650109 73 9 0374 n Butylamine 897 mg m3 300 ppm 1097391189 85 1 1533 tert Butyl chromate 15 mg m3 1189851 carcinogenic substance2426 08 6 0115 n Butyl glycidyl ether 1332 5 mg m3 250 ppm 2426086109 79 5 0018 n Butyl mercaptan 1845 mg m3 500 ppm 10979598 51 1 1068 p tert Butyltoluene 607 mg m3 100 ppm 985117440 43 9 0020 Cadmium dust 9 mg m3 7440439 carcinogenic substance1306 19 0 0020 Cadmium fume 9 mg m3 7440439 carcinogenic substance7778 44 1 0765 Calcium arsenate 5 mg m3 7778441 carcinogenic substance1305 78 8 0409 Calcium oxide 25 mg m3 130578876 22 2 1021 Camphor 200 mg m3 7622263 25 2 0121 Carbaryl 100 mg m3 632521333 86 4 0471 Carbon black 1750 mg m3 1333864124 38 9 0021 Carbon dioxide 72000 mg m3 40000 ppm 12438975 15 0 0022 Carbon disulfide 1555 mg m3 500 ppm 75150630 08 0 0023 Carbon monoxide 1380 mg m3 1200 ppm 63008056 23 5 0024 Carbon tetrachloride 1258 mg m3 200 ppm 56235 carcinogenic substance57 74 9 0740 Chlordane 100 mg m3 57749 carcinogenic substance8001 35 2 0843 Chlorinated camphene 200 mg m3 8001352 carcinogenic substance31242 93 0 Chlorinated diphenyl oxide 5 mg m3 312429307782 50 5 0126 Chlorine 29 mg m3 10 ppm 778250510049 04 4 0127 Chlorine dioxide 13 35 mg m3 5 ppm 100490447790 91 2 0656 Chlorine trifluoride 75 6 mg m3 20 ppm 7790912107 20 0 0706 Chloroacetaldehyde 144 5 mg m3 45 ppm 107200532 27 4 0128 a Chloroacetophenone 15 mg m3 532274108 90 7 0642 Chlorobenzene 4610 mg m3 1000 ppm 1089072698 41 1 1065 o Chlorobenzylidene malonitrile 2 mg m3 269841174 97 5 0392 Chlorobromomethane 10580 mg m3 2000 ppm 7497553469 21 9 0175 Chlorodiphenyl 42 chlorine 5 mg m3 53469219 carcinogenic substance11097 69 1 0939 Chlorodiphenyl 54 chlorine 5 mg m3 53469219 carcinogenic substance67 66 3 0027 Chloroform 2440 mg m3 500 ppm 67663 carcinogenic substance600 25 9 1423 1 Chloro 1 nitropropane 5 06 mg m3 100 ppm 60025976 06 2 0750 Chloropicrin 13 44 mg m3 2 ppm 76062126 99 8 0133 b Chloroprene 10 86 mg m3 300 ppm 126998 carcinogenic substance1333 82 0 1194 Chromium trioxide 15 mg m3 1333820 carcinogenic substance Chromium II 250 mg m3 cr2m3 Chromium III 25 mg m3 cr3m37440 47 3 0029 Chromium 250 mg m3 744047365996 93 2 1415 Coal tar pitch volatiles 80 mg m3 65996932 carcinogenic substance7440 48 4 0782 Cobalt 20 mg m3 74404847440 50 8 0240 Copper 100 mg m3 7440508 Cotton dust raw 100 mg m3 cotdust136 78 7 1142 Crag herbicide 500 mg m3 136787108 39 4 0646 m Cresol 1107 5 mg m3 250 ppm cresol95 48 7 0030 o Cresol 1107 5 mg m3 250 ppm cresol106 44 5 0031 p Cresol 1107 5 mg m3 250 ppm cresol4170 30 3 0241 Crotonaldehyde 143 5 mg m3 50 ppm 12373998 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 110827108 93 0 0243 Cyclohexanol 1640 mg m3 400 ppm 108930108 94 1 0425 Cyclohexanone 2814 mg m3 700 ppm 108941110 83 8 1054 Cyclohexene 6720 mg m3 2000 ppm 110838542 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 org94 75 7 0033 2 4 D 100 mg m3 9475750 29 3 0034 DDT 500 mg m3 50293 carcinogenic substance17702 41 9 0712 Decaborane 15 mg m3 177024198065 48 3 0861 Demeton 10 mg m3 8065483123 42 2 0647 Diacetone alcohol 8550 mg m3 1800 ppm 123422334 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 19287457107 66 4 1278 Dibutyl phosphate 258 mg m3 30 ppm 10766484 74 2 0036 Dibutyl phthalate 4000 mg m3 8474295 50 1 1066 o Dichlorobenzene 1202 mg m3 200 ppm 95501106 46 7 0037 p Dichlorobenzene 906 mg m3 150 ppm 106467 carcinogenic substance75 71 8 0048 Dichlorodifluoromethane 7425 mg m3 15000 ppm 75718118 52 5 1 3 Dichloro 5 5 dimethylhydantoin 5 mg m3 11852575 34 3 0249 1 1 Dichloroethane 12150 mg m3 3000 ppm 75343540 59 0 0436 1 2 Dichloroethylene 3970 mg m3 1000 ppm 540590111 44 4 0417 Dichloroethyl ether 585 mg m3 100 ppm 111444 carcinogenic substance75 43 4 1106 Dichloromonofluoromethane 21050 mg m3 5000 ppm 75434594 72 9 0434 Dichloronitroethane 147 3 mg m3 25 ppm 59472976 14 2 0649 Dichlorotetrafluoroethane 104850 mg m3 15000 ppm 7614262 73 7 0872 Dichlorvos 100 mg m3 6273760 57 1 0787 Dieldrin 50 mg m3 60571 carcinogenic substance109 89 7 0444 Diethylamine 5980 mg m3 200 ppm 109897100 37 8 0257 2 Diethylaminoethanol 479 mg m3 100 ppm 10037875 61 6 1419 Difluorodibromomethane 17160 mg m3 2000 ppm 756162238 07 5 0145 Diglycidyl ether 53 3 mg m3 10 ppm 2238075 carcinogenic substance108 83 8 0713 Diisobutyl ketone 2910 mg m3 500 ppm 108838108 18 9 0449 Diisopropylamine 828 mg m3 200 ppm 108189127 19 5 0259 Dimethyl acetamide 1068 mg m3 300 ppm 127195124 40 3 1485 Dimethylamine 925 mg m3 500 ppm 124403121 69 7 0877 N N Dimethylaniline 4 96 mg m3 100 ppm 121697300 76 5 0925 Naled 200 mg m3 30076568 12 2 0457 Dimethylformamide 1495 mg m3 500 ppm 6812257 14 7 0147 1 1 Dimethylhydrazine 371 5 mg m3 15 ppm 57147 carcinogenic substance131 11 3 0261 Dimethylphthalate 2000 mg m3 13111377 78 1 0148 Dimethyl sulfate 36 1 mg m3 7 ppm 77781 carcinogenic substance99 65 0 0691 m Dinitrobenzene 50 mg m3 528290528 29 0 0460 o Dinitrobenzene 50 mg m3 528290100 25 4 0692 p Dinitrobenzene 50 mg m3 528290534 52 1 0462 Dinitro o cresol 5 mg m3 53452125321 14 6 0465 Dinitrotoluene 50 mg m3 25321146 carcinogenic substance117 81 7 0271 Di sec octyl phthalate 5000 mg m3 117817 carcinogenic substance123 91 1 0041 Dioxane 1800 mg m3 500 ppm 123911 carcinogenic substance92 52 4 0106 Diphenyl 100 mg m3 9252434590 94 8 0884 Dipropylene glycol methyl ether 3636 mg m3 600 ppm 3459094872 20 8 1023 Endrin 2 mg m3 72208106 89 8 0043 Epichlorohydrin 283 5 mg m3 75 ppm 106898 carcinogenic substance2104 64 5 0753 EPN 5 mg m3 2104645141 43 5 0152 Ethanolamine 75 mg m3 30 ppm 141435110 80 5 0060 2 Ethoxyethanol 1845 mg m3 500 ppm 110805111 15 9 0364 2 Ethoxyethyl acetate 2705 mg m3 500 ppm 111159141 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 substance64 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 75047100 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 74964106 35 4 0889 Ethyl butyl ketone 4670 mg m3 1000 ppm 10635475 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 107073107 15 3 0269 Ethylenediamine 2460 mg m3 1000 ppm 107153106 93 4 0045 Ethylene dibromide 769 mg m3 100 ppm 106934 carcinogenic substance107 06 2 0250 Ethylene dichloride 202 5 mg m3 50 ppm 107062 carcinogenic substance628 96 6 1056 Ethylene glycol dinitrate 75 mg m3 628966151 56 4 0100 Ethyleneimine 176 mg m3 100 ppm 151564 carcinogenic substance75 21 8 0155 Ethylene oxide 1440 mg m3 800 ppm html carcinogenic substance60 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 10994475 08 1 0470 Ethyl mercaptan 1270 mg m3 500 ppm 75081100 74 3 0480 N Ethylmorpholine 471 mg m3 100 ppm 10074378 10 4 0333 Ethyl silicate 5964 mg m3 700 ppm 7810414484 64 1 0792 Ferbam 800 mg m3 1448464112604 58 9 Ferrovanadium dust 500 mg m3 126045897782 41 4 0046 Fluorine 38 8 mg m3 25 ppm 778241475 69 4 0047 Fluorotrichloromethane 11240 mg m3 2000 ppm 7569450 00 0 0695 Formaldehyde 24 6 mg m3 20 ppm 50000 carcinogenic substance 0695 Formalin 24 6 mg m3 20 ppm 50000 carcinogenic substance64 18 6 0485 Formic acid 56 4 mg m3 30 ppm 6418698 01 1 0276 Furfural 393 mg m3 100 ppm 9801198 00 0 0794 Furfuryl alcohol 300 8 mg m3 75 ppm 98000556 52 5 0159 Glycidol 454 5 mg m3 150 ppm 5565257782 42 5 0893 Graphite natural 1250 mg m3 77824257440 58 6 0847 Hafnium 50 mg m3 744058676 44 8 0743 Heptachlor 35 mg m3 76448 carcinogenic substance142 82 5 0657 n Heptane 3075 mg m3 750 ppm 14282567 72 1 0051 Hexachloroethane 2904 mg m3 300 ppm 67721 carcinogenic substance1335 87 1 0997 Hexachloronaphthalene 2 mg m3 1335871110 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 591786108 10 1 0511 Hexone 2050 mg m3 500 ppm 108101108 84 9 1335 sec Hexyl acetate 2950 mg m3 500 ppm 108849302 01 2 0281 Hydrazine 65 5 mg m3 50 ppm 302012 carcinogenic substance10035 10 6 0282 Hydrogen bromide 99 3 mg m3 30 ppm 100351067647 01 0 0163 Hydrogen chloride 74 5 mg m3 50 ppm 764701074 90 8 0492 Hydrogen cyanide 55 mg m3 50 ppm 749087664 39 3 0283 Hydrogen fluoride 24 6 mg m3 30 ppm 76643937722 84 1 Hydrogen peroxide 104 mg m3 75 ppm 7728417783 07 5 0284 Hydrogen selenide 3 3 mg m3 1 ppm 77830757783 06 4 0165 Hydrogen sulfide 140 mg m3 100 ppm 7783064123 31 9 0166 Hydroquinone 50 mg m3 1233197553 56 2 0167 Iodine 20 76 mg m3 2 ppm 75535621309 37 1 1577 Iron III oxide 2500 mg m3 1309371123 92 2 0356 Isoamyl acetate 5330 mg m3 1000 ppm 123922123 51 3 0798 Isoamyl alcohol primary 1805 mg m3 500 ppm 1235136032 29 7 Isoamyl alcohol secondary 1805 mg m3 500 ppm 123513110 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 7883178 59 1 0169 Isophorone 1130 mg m3 200 ppm 78591108 21 4 0907 Isopropyl acetate 7524 mg m3 1800 ppm 10821467 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 75310108 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 4016142463 51 4 0812 Ketene 8 6 mg m3 5 ppm 4635147439 92 1 0052 Lead 100 mg m3 743992158 89 9 0053 Lindane 50 mg m3 588997580 67 8 0813 Lithium hydride 0 5 mg m3 758067868476 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 1309484121 75 5 0172 Malathion 250 mg m3 121755108 31 6 0799 Maleic anhydride 10 mg m3 1083167439 96 5 0174 Manganese 500 mg m3 74399657439 97 6 0056 Mercury 10 mg m3 7439976 1304 Mercury organo alkyl compounds 2 mg m3 merc hg141 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 substance79 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 96333109 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 6756174 89 5 1483 Methylamine 127 mg m3 100 ppm 74895110 43 0 0920 Methyl n amyl ketone 3736 mg m3 800 ppm 11043074 83 9 0109 Methyl bromide 972 mg m3 250 ppm 74839 carcinogenic substance109 86 4 0061 Methyl Cellosolve 622 mg m3 200 ppm 109864110 49 6 0476 Methyl Cellosolve acetate 966 mg m3 200 ppm 11049674 87 3 0419 Methyl chloride 4140 mg m3 2000 ppm 74873 carcinogenic substance71 55 6 0079 Methyl chloroform 3822 mg m3 700 ppm 71556108 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 25639423583 60 8 2 Methylcyclohexanone 2754 mg m3 600 ppm 583608101 68 8 0298 Methylene bisphenyl isocyanate 75 mg m3 10168875 09 2 0058 Methylene chloride 7981 mg m3 2300 ppm 75092 carcinogenic substance107 31 3 0664 Methyl formate 11070 mg m3 4500 ppm 107313541 85 5 1391 5 Methyl 3 heptanone 524 mg m3 100 ppm 54185560 34 4 0180 Methyl hydrazine 37 8 mg m3 20 ppm 60344 carcinogenic substance74 88 4 0509 Methyl iodide 580 mg m3 100 ppm 74884 carcinogenic substance108 11 2 0665 Methyl isobutyl carbinol 1672 mg m3 400 ppm 108112624 83 9 0004 Methyl isocyanate 7 mg m3 3 ppm 62483974 93 1 0299 Methyl mercaptan 295 5 mg m3 150 ppm 7493180 62 6 0300 Methyl methacrylate 4090 mg m3 1000 ppm 8062698 83 9 0732 alpha Methylstyrene 3381 mg m3 700 ppm 9883912001 26 2 Mica 1500 mg m3 120012627439 98 7 1003 Molybdenum 5000 mg m3 7439987 1003 Molybdenum soluble compounds 1000 mg m3 moly mo100 61 8 0921 Monomethyl aniline 438 mg m3 100 ppm 100618110 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 9120313463 39 3 0064 Nickel carbonyl 14 mg m3 2 ppm 13463393 carcinogenic substance7440 02 0 0062 Nickel 10 mg m3 7440020 carcinogenic substance54 11 5 0519 Nicotine 5 mg m3 541157697 37 2 0183 Nitric acid 64 5 mg m3 25 ppm 769737210102 43 9 1311 Nitric oxide 123 mg m3 100 ppm 10102439100 01 6 0308 p Nitroaniline 300 mg m3 10001698 95 3 0065 Nitrobenzene 1008 mg m3 200 ppm 98953100 00 5 0846 p Nitrochlorobenzene 100 mg m3 10000579 24 3 0817 Nitroethane 3070 mg m3 1000 ppm 7924310102 44 0 0930 Nitrogen dioxide 37 6 mg m3 20 ppm 101024407783 54 2 1234 Nitrogen trifluoride 2900 mg m3 2000 ppm 778354255 63 0 0186 Nitroglycerine 75 mg m3 5563075 52 5 0522 Nitromethane 1875 mg m3 750 ppm 75525108 03 2 1050 1 Nitropropane 3640 mg m3 1000 ppm 10803279 46 9 0187 2 Nitropropane 354 mg m3 100 ppm 79469 carcinogenic substance99 08 1 1411 m Nitrotoluene 1122 mg m3 200 ppm 8872288 72 2 0931 o Nitrotoluene 1122 mg m3 200 ppm 8872299 99 0 0932 p Nitrotoluene 1122 mg m3 200 ppm 887222234 13 1 1059 Octachloronaphthalene 1 mg m3 2234131111 65 9 0933 Octane 4670 mg m3 1000 ppm 111659 10 Lower explosive limit LEL 8012 95 1 Oil mist mineral 2500 mg m3 801295120816 12 0 0528 Osmium tetroxide 1 mg m3 208161207783 41 7 0818 Oxygen difluoride 1 mg m3 0 5 ppm 778341710028 15 6 0068 Ozone 9 8 mg m3 5 ppm 100281561910 42 5 0005 Paraquat 1 mg m3 191042556 38 2 0006 Parathion 10 mg m3 5638219624 22 7 0819 Pentaborane 2 6 mg m3 1 ppm 1962422787 86 5 0069 Pentachlorophenol 2 5 mg m3 87865109 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 107879594 42 3 0311 Perchloromethyl mercaptan 10 mg m3 76 ppm 5944237616 94 6 1114 Perchloryl fluoride 419 mg m3 100 ppm 76169468002 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 108952106 50 3 0805 p Phenylene diamine 25 mg m3 106503101 84 8 0791 Phenyl ether 100 mg m3 696 ppm 101848122 60 1 0188 Phenyl glycidyl ether 614 mg m3 100 ppm 122601 carcinogenic substance100 63 0 0938 Phenylhydrazine 66 3 mg m3 15 ppm 100630 carcinogenic substance7786 34 7 0924 Phosdrin 36 7 mg m3 4 ppm 778634775 44 5 0007 Phosgene 8 1 mg m3 2 ppm 754457803 51 2 0694 Phosphine 69 5 mg m3 50 ppm 78035127664 38 2 1008 Phosphoric acid 1000 mg m3 76643827723 14 0 0628 Phosphorus yellow 5 mg m3 7723140 html 772314010026 13 8 0544 Phosphorus pentachloride 70 mg m3 100261381314 80 3 1407 Phosphorus pentasulfide 250 mg m3 13148037719 12 2 0696 Phosphorus trichloride 140 mg m3 25 ppm 771912285 44 9 0315 Phthalic anhydride 60 mg m3 8544988 89 1 0316 Picric acid 75 mg m3 8889183 26 1 1515 Pindone 100 mg m3 83261 Platinum soluble salts as Pt 4 mg m3 platinum65997 15 1 1425 Portland cement 5000 mg m3 65997151151 50 8 0671 Potassium cyanide 25 mg m3 cyanides74 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 10960471 23 8 0553 n Propyl alcohol 1968 mg m3 800 ppm 7123878 87 5 0441 Propylene dichloride 1848 mg m3 400 ppm 78875 carcinogenic substance75 55 8 0322 Propylene imine 234 mg m3 100 ppm 75558 carcinogenic substance75 56 9 0192 Propylene oxide 952 mg m3 400 ppm 75569 carcinogenic substance627 13 4 1513 n Propyl nitrate 2150 mg m3 500 ppm 6271348003 34 7 1475 Pyrethrum 5000 mg m3 8003347110 86 1 0323 Pyridine 3240 mg m3 1000 ppm 110861106 51 4 0779 Quinone 100 mg m3 1065147440 16 6 1247 Rhodium metal fume and insoluble compounds as Rh 100 mg m3 rhodium Rhodium soluble compounds as Rh 2 mg m3 rhodium299 84 3 0975 Ronnel 300 mg m3 29984383 79 4 0944 Rotenone 2500 mg m3 837947782 49 2 0072 Selenium 1 mg m3 77824927783 79 1 0947 Selenium hexafluoride 15 8 mg m3 2 ppm 77837917631 86 9 Silica amorphous 3000 mg m3 763186914808 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 soapston15096 52 3 1565 Sodium aluminum fluoride 250 mg m3 fluoride143 33 9 1118 Sodium cyanide 25 mg m3 cyanides7681 49 4 0951 Sodium fluoride 250 mg m3 fluoride62 74 8 0484 Sodium fluoroacetate 2 5 mg m3 627481310 73 2 0360 Sodium hydroxide 10 mg m3 13107327803 52 3 0776 Stibine 25 5 mg m3 5 ppm 78035238052 41 3 0361 Stoddard solvent 20 000 mg m3 805241357 24 9 0197 Strychnine 3 mg m3 57249100 42 5 0073 Styrene 2982 mg m3 700 ppm 1004257446 09 5 0074 Sulfur dioxide 262 mg m3 100 ppm 74460957664 93 9 0362 Sulfuric acid 15 mg m3 766493910025 67 9 0958 Sulfur monochloride 27 6 mg m3 5 ppm 100256795714 22 7 Sulfur pentafluoride 10 4 mg m3 1 ppm 57142272699 79 8 1402 Sulfuryl fluoride 836 mg m3 200 ppm 269979893 76 5 0075 2 4 5 Trichlorophenoxyacetic acid 250 mg m3 9376514807 96 6 0329 Talc 1000 mg m3 148079667440 25 7 1596 Tantalum 2500 mg m3 74402573689 24 5 0985 TEDP 10 mg m3 368924513494 80 9 0986 Tellurium 25 mg m3 134948097783 80 4 Tellurium hexafluoride 9 9 mg m3 1 ppm 7783804107 49 3 1158 TEPP 5 mg m3 10749392 06 8 m Terphenyl 500 mg m3 2614060384 15 1 1525 o Terphenyl 500 mg m3 2614060392 94 4 p Terphenyl 500 mg m3 2614060376 11 9 1420 1 1 1 2 Tetrachloro 2 2 difluoroethane 16680 mg m3 2000 ppm 7611976 12 0 1421 Freon 112 16680 mg m3 2000 ppm 7612079 34 5 0332 1 1 2 2 Tetrachloroethane 687 mg m3 100 ppm 79345 carcinogenic substance127 18 4 0076 Tetrachloroethylene 1017 mg m3 150 ppm 127184 carcinogenic substance78 00 2 0008 Tetraethyl lead 40 mg m3 78002109 99 9 0578 Tetrahydrofuran 5900 mg m3 2000 ppm 109999 10 Lower explosive limit LEL 75 74 1 0200 Tetramethyl lead 40 mg m3 757413333 52 6 1121 Tetramethyl succinonitrile 27 9 mg m3 5 ppm 3333526509 14 8 1468 Tetranitromethane 32 mg m3 4 ppm 509148479 45 8 0959 Tetryl 750 mg m3 479458 Thallium soluble compounds 15 mg m3 thallium137 26 8 0757 Thiram 100 mg m3 1372687440 31 5 1535 Tin 100 mg m3 7440315 Tin organic compounds 25 mg m3 tin org13463 67 7 0338 Titanium dioxide 5000 mg m3 13463677 carcinogenic substance108 88 3 0078 Toluene 1885 mg m3 500 ppm 108883584 84 9 0339 Toluene 2 4 diisocyanate 17 8 mg m3 2 5 ppm 584849 carcinogenic substance95 53 4 0341 o Toluidine 219 mg m3 50 ppm 95534 carcinogenic substance126 73 8 0584 Tributyl phosphate 327 mg m3 30 ppm 12673879 00 5 0080 1 1 2 Trichloroethane 546 mg m3 100 ppm 79005 carcinogenic substance79 01 6 0081 Trichloroethylene 5370 mg m3 1000 ppm 79016 carcinogenic substance96 18 4 0683 1 2 3 Trichloropropane 603 mg m3 100 ppm 96184 carcinogenic substance76 13 1 0050 1 1 2 Trichloro 1 2 2 trifluoroethane 15340 mg m3 2000 ppm 76131121 44 8 0203 Triethylamine 828 mg m3 200 ppm 12144875 63 8 0837 Trifluorobromomethane 243 600 mg m3 40 000 ppm 75638118 96 7 0967 2 4 6 Trinitrotoluene 500 mg m3 11896778 30 8 0961 Triorthocresyl phosphate 40 mg m3 78308115 86 6 1062 Triphenyl phosphate 1000 mg m3 1158668006 64 2 1063 Turpentine 4448 mg m3 8000 ppm 80066427440 61 1 1251 Uranium insoluble compounds 10 mg m3 7440611 carcinogenic substance Uranium soluble compounds 10 mg m3 uranium carcinogenic substance7440 62 2 Vanadium dust 35 mg m3 vandust1314 62 1 Vanadium fume 35 mg m3 vanfume25013 15 4 0514 Vinyl toluene 1932 mg m3 400 ppm 2501315481 81 2 0821 Warfarin 100 mg m3 81812108 38 3 0085 m Xylene 3906 mg m3 900 ppm 9547695 47 6 0084 o Xylene 3906 mg m3 900 ppm 95476106 42 3 0086 p Xylene 3906 mg m3 900 ppm 954761300 73 8 0600 Xylidine 248 mg m3 50 ppm 13007387440 65 5 Yttrium 500 mg m3 74406557646 85 7 1064 Zinc chloride fume 50 mg m3 76468571314 13 2 0208 Zinc oxide 500 mg m3 13141327440 67 7 1405 Zirconium compounds 25 mg m3 7440677IDLH values for several gases and vapors military Number Substance IDLH value SourceCAS ICSC mg m3 ppm7782 50 5 0126 Chlorine 29 mg m3 10 ppm 7782505100 44 7 0016 Benzyl chloride used in chemical weapons 6 51 8 mg m3 10 ppm 10044777 78 1 0148 Dimethyl sulfate used in chemical weapons 7 36 1 mg m3 7 ppm 77781 carcinogenic substance76 06 2 0750 Chloropicrin 13 44 mg m3 2 ppm 7606275 44 5 0007 Phosgene used in chemical weapons 8 1 mg m3 2 ppm 754455714 22 7 Sulfur pentafluoride about 4 times as poisonous as phosgene 10 4 mg m3 1 ppm 5714227505 60 2 0418 Sulfur mustard 4 7 mg m3 0 7 ppm 2975000877 81 6 Tabun 0 7 mg m3 0 1 ppm nerve77 81 6 Sarin 0 6 mg m3 0 1 ppm nerve96 64 0 Soman Zoman 0 4 mg m3 0 05 ppm nerve329 99 7 Cyclosarin 0 4 mg m3 0 05 ppm nerve50782 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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