Hydrogen chloride - HCl

Hydrogen chloride (HCl) is a poisonous, colourless gas with pungent smell.

Hydrogen chloride can be used in many applications, for example in calibration gas mixtures for environmental emissions monitoring. HCl is also used in the chemical industry and metal industry.

The major hazards of HCl are inhalation and body contact.


  • Molecular weight:

    36.461 g/mol

  • Gaseous phase:

    Gas density (1.013 bar at boiling point): 2.1 kg/m3
    Gas density (1.013 bar and 15 °C (59 °F)): 1.56 kg/m3

  • Solid phase:

    Melting point: -114.18 °C

  • Liquid phase:

    Boiling point: (1.013 bar): -85 °C
    Liquid density: (1.013 bar at boiling point): 1192.98 kg/m3

  • Critical point:

    Critical temperature: 0.975 °C
    Critical pressure: 83.56 bar
    Critical density: 450.136 kg/m3