Hydrogen cyanide (anhydrous)HCN

CAS-No.:
74-90-8
UN-No.:
1051
EC-No.:
200-821-6
Hazard identification number:
663
Warning sign:
  • 663
  • 1051
Hazard signs
GHS02
GHS05
GHS06
GHS08
GHS09
Occupational exposure limit
Workplace exposure limits (UK)
  • TWA (ppm) 0.9
  • TWA (mg/m3) 1
  • STEL (ppm) 4.5
  • STEL (mg/m3) 5
  • H: 224
    Extremely flammable liquid and vapour.
  • H: 300 + 310 + 330
    Fatal if swallowed, in contact with skin or if inhaled
  • H: 372
    Causes damage to organs (state all organs affected, if known) through prolonged or repeated exposure (state route of exposure if it is conclusively
    proven that no other routes of exposure cause the hazard)
  • H: 410
    Very toxic to aquatic life with long lasting effects
  • Melting point:
    -13 °C
  • Boiling Point:
    26 °C
  • Density (at 20 °C, if not notified otherwise):
    0,69 g/cm3
  • Ionization:
    13.60 ± 0.01 eV
  • Flash Point:
    < -20 °C
  • Ignition Temperature:
    535 °C
  • Vapour Pressure (at 20 °C, if not notified otherwise):
    817 hPa
  • Lower Explosive Limit:
    5.4 Vol.-%
  • Upper Explosive Limit:
    46.6 Vol.-%
  •  
Also known as:
  • cyanide
  • Formic anammonide
  • Formonitrile
  • Hydrocyanic acid
  • Methanenitrile
  • Prussic acid
  • toxic twins

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