A flammable refrigerant gas with very low GWP for R134a (HFC) replacement in Refrigerator and Refrigeration systems, substitution of this refrigerant for motor vehicle air conditioning systems not originally designed for R600a is widely prohibited or discouraged.


Melting Point−159.42 °C
Boiling Point−11.7 °C
Density2.51 kg/m3 (at 15 °C, 100 kPa)
FormsLiquified gas, Flammable

Uses and Applications

Key applications

  • Refrigerating and air-conditioning systems

Synonyms: Isobutane, I-butane, 2-methylpropane, methylpropane

Chemical Formula: C4H10

CAS Number: 75-28-5