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R437A (Freon™/Isceon® MO49 Plus)

R437A (Freon™/Isceon MO49 Plus) is a HFC blend used as a retrofit refrigerant for R12 in medium and high-temperature refrigeration such as automotive air- conditioning systems.

Packaging Information





  • Available from A‑Gas wholesale partners - find a supplier 
  • A‑Gas product cylinders are fitted with a Residual Pressure Device (RPD) to ensure used refrigerant or any other substance cannot be reintroduced into a cylinder
  • Store cylinders in a cool, dry, well-ventilated area, out of direct sunlight
  • A‑Gas operates a returnable cylinder fleet - empty cylinders are to be returned to an A‑Gas wholesale partner
  • For alternative or larger package sizes please contact A-Gas on 01275376600 or via the Contact Us form


Automotive Air Conditioning

Commercial Refrigeration

Domestic Refrigeration

Product Features & Benefits

  • GWP: 1805
  • Replaces R12 and HCFC containing blends such as MP39, MP66, R409A
  • Zeotropic refrigerant blend containing R125, R134a, butane and isopentane
  • Refrigerant must be charged from the liquid phase to ensure accurate composition
  • A‑Gas refrigerant cylinders have dual port valves, making liquid offtake easier
  • Non-flammable with a safety classification of A1
  • Compressors can be charged with most current oils but better oil return will occur with polyolester oils - contact the compressor manufacturer for more information
  • R413A (Isceon MO49) production was phased out with all other HCFC blends hence the introduction of R437A (Isceon MO49 Plus)
  • Up to 11% higher capacity compared to R12
  • Lower discharge temperature compared to R12
  • Provides cost-effective retrofits
  • The information contained within this website is for guidance only - for further system-specific advice please contact us directly