Methyl isocyanate
Chemical compound / From Wikipedia, the free encyclopedia
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Not to be confused with Methyl isocyanide.
Quick Facts Names, Identifiers ...
Names | |
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Preferred IUPAC name
Isocyanatomethane | |
Other names
Methyl carbylamine MIC | |
Identifiers | |
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3D model (JSmol) |
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ChEBI | |
ChemSpider |
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ECHA InfoCard | 100.009.879 |
PubChem CID |
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UNII | |
CompTox Dashboard (EPA) |
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Properties | |
C2H3NO | |
Molar mass | 57.051 g/mol |
Appearance | Colorless liquid |
Odor | Sharp, pungent odor[1] |
Density | 0.9230 g/cm3 at 27 °C |
Melting point | −45 °C (−49 °F; 228 K)[2] |
Boiling point | 38.3–41 °C (100.9–105.8 °F; 311.4–314.1 K)[2] |
10% (15°C)[1] | |
Vapor pressure | 57.7 kPa |
Structure | |
2.8 D | |
Thermochemistry | |
Std enthalpy of formation (ΔfH⦵298) |
−92.0 kJ·mol−1[2] |
Std enthalpy of combustion (ΔcH⦵298) |
-1.1275E+06 J/mol[3] |
Hazards | |
GHS labelling: | |
H225, H300, H311, H315, H317, H318, H330, H334, H335, H361d | |
P201, P202, P210, P233, P240, P241, P242, P243, P260, P261, P264, P270, P271, P272, P280, P281, P284, P285, P301+P310, P302+P352, P303+P361+P353, P304+P340, P304+P341, P305+P351+P338, P308+P313, P310, P312, P320, P321, P322, P330, P332+P313, P333+P313, P342+P311, P361, P362, P363, P370+P378, P403+P233, P403+P235, P405, P501 | |
NFPA 704 (fire diamond) | |
Flash point | −7 °C (19 °F; 266 K) |
534 °C (993 °F; 807 K) | |
Explosive limits | 5.3–26%[2] |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
120 mg/kg (oral, mouse) 51.5 mg/kg (oral, rat)[4] |
LC50 (median concentration) |
6.1 ppm (rat, 6 hr) 12.2 ppm (mouse, 6 hr) 5.4 ppm (guinea pig, 6 hr) 21 ppm (rat, 2 hr)[4] |
NIOSH (US health exposure limits): | |
PEL (Permissible) |
TWA 0.02 ppm (0.05 mg/m3) [skin][1] |
REL (Recommended) |
TWA 0.02 ppm (0.05 mg/m3) [skin][1] |
IDLH (Immediate danger) |
3 ppm[1] |
Related compounds | |
Related compounds |
Methyl isothiocyanate |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Methyl isocyanate (MIC) is an organic compound with the molecular formula CH3NCO. Synonyms are isocyanatomethane and methyl carbylamine. Methyl isocyanate is an intermediate chemical in the production of carbamate pesticides (such as carbaryl, carbofuran, methomyl, and aldicarb). It has also been used in the production of rubbers and adhesives. As an extremely toxic and irritating compound, it is very hazardous to human health. MIC was the principal toxicant involved in the Bhopal gas disaster, which eventually killed around 20,000 people in total as per official figures.[6][7][8][9][10][11][12] It is also a very potent lachrymatory agent.