Immediately dangerous to life or health (IDLH) value profile : Methyl Isocyanate [CAS® No. 624-83-9]
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Immediately dangerous to life or health (IDLH) value profile : Methyl Isocyanate [CAS® No. 624-83-9]
  • Published Date:

    December 2016

  • Series:
    DHHS publication ; no. (NIOSH) 2017-105
  • Language:
    English
Filetype[PDF-488.20 KB]


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  • Description:
    Basis for IDLH value: The IDLH value for methyl isocyanate is based on the LOAEL for severe reproductive and developmental effects. Varma [1987] reported a LOAEL of 2 ppm for these developmental and reproductive effects in dams exposed for 3 hours on gestation day (GD) 8. This represents a one-time acute exposure at a critical developmental time of the dam and fetuses. The LOAEL was adjusted to a 30-minute equivalent duration concentration of 3.6 ppm. A composite uncertainty factor of 30 was applied to account for extrapolation from a concentration that causes severe effects in animals, animal to human differences, human variability, and uncertainty about the threshold for escape-impairing effects, yielding an IDLH value of 0.12 ppm. Suggested citation: NIOSH [2016]. Immediately dangerous to life or health (IDLH) value profile: methyl isocyanate. By Dotson GS, Maier A, Parker A, Haber L. Cincinnati, OH: US Department of Health and Human Services, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication 2017-105.
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