Hydrogen cyanide

Formonitrile, hydrocyanic acid, Prussic acid

Hydrogen cyanide

Formula: HCN | CAS: 74-90-8

Synonyms: Formonitrile, hydrocyanic acid, Prussic acid

Specification

SpecificationValue/Information
FormulaHCN
CAS no.74-90-8
Gas Response Factor, 11.7 eVZR
Gas Response Factor, 10.6 eVZR
Gas Response Factor, 10.0 eVZR
ppm per mg/m⁻³, (20 °C, 1 bar)0.829
Molecular Weight, g/mole27.0
Melting point, °C-13.4
Boiling point, °C26
Flash point, °C-17.8
Upper Explosive Limit, %40
Lower Explosive Limit, %5.6
SpecificationValue/Information
Density, g.cm⁻³0.69
Ionisation Energy, eV13.6
EH40 STEL, ppm10
EH40 STEL, mg.m⁻³11
NIOSH ST, ppm4.7
NIOSH TWA REL, ppm5
NIOSH ST, mg.m⁻³4.7
NIOSH TWA REL, mg.m⁻³5
NIOSH IDLH, ppm50
OSHA TWA PEL, ppm10
OSHA TWA PEL, mg.m⁻³11