1,3-Butadiene - C4H6

1,3-Butadiene has the chemical formula C4H6 and the structural formula H2C=CH-CH=CH2. It is an important industrial chemical used as a monomer in the production of synthetic rubber. It is also used in mixtures to calibrate analysers for the petrochemical analysis.

Its major hazards are fire and reactivity.


  • Molecular weight:

    54.09 g/mol

  • Gaseous phase:
    Gas density (1.013 bar at boiling point): 2.55 kg/m
    Gas density (1.013 bar and 15 °C (59 °F)): 2.36 kg/m3  
  • Solid phase:

    Melting point: -108.9 °C

  • Liquid phase:

    Boiling point (1.013 bar): -4.5 °C
    Liquid density (1.013 bar at boiling point): 650 kg/m3

  • Critical point:

    Critical temperature: 152 °C 
    Critical pressure: 43.22 bar