R600A

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As a refrigerant, isobutane poses a fire and explosion risk in addition to the hazards associated with non-flammable CFC refrigerants. Substitution of this refrigerant for motor vehicle air conditioning systems not originally designed for isobutane is widely prohibited or discouraged. R600a (isobutane) is refrigerant grade isobutane used as a replacement for R12 and R134a in a variety of high-temperature refrigeration applications.

R600a (isobutane) is a hydrocarbon that is becoming increasingly popular due to its low Global Warming Potential (GWP). It is the refrigerant of choice for domestic and light commercial refrigeration units, including fridges and freezers, drink dispensers and standalone display units.
 

Properties
Chemical formula C4H10
Molar mass 58.124 g·mol−1
Appearance Colorless gas
Odor Odorless
Density
  • 2.51 kg/m3 (at 15 °C, 100 kPa)
  • 563 kg/m3 (at 15 °C, boiling liquid)
Melting point −159.42 °C (−254.96 °F; 113.73 K)[4]
Boiling point −11.7 °C (10.9 °F; 261.4 K)[4]
Solubility in water 48.9 mg⋅L−1 (at 25 °C (77 °F))[2]
Vapor pressure 3.1 atm (310 kPa) (at 21 °C (294 K; 70 °F))[3]
Henry's law
constant
 (kH)
8.6 nmol⋅Pa−1⋅kg−1
Conjugate acid Isobutanium
Magnetic susceptibility (χ) −51.7·10−6 cm3/mol
Thermochemistry
Heat capacity (C) 96.65 J⋅K−1⋅mol−1
Std enthalpy of
formation
 (ΔfH)298)
−134.8 – −133.6 kJ⋅mol−1
Std enthalpy of
combustion
 (ΔcH)298)
−2.86959 – −2.86841 MJ⋅mol−1
Hazards
GHS labelling:
Pictograms GHS02: Flammable
Signal word Danger
Hazard statements H220
Precautionary statements P210
NFPA 704 (fire diamond)  
Flash point −83 °C (−117 °F; 190 K)
Autoignition
temperature
460 °C (860 °F; 733 K)
Explosive limits 1.4–8.3%
NIOSH (US health exposure limits):
PEL (Permissible) None[5]
REL (Recommended) TWA 800 ppm (1900 mg/m3)[5]
IDLH (Immediate danger) N.D.[5]

 

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