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Chemours Refrigerants

Freon™ MP66 refrigerant

Freon™ MP66 is an HCFC-based refrigerant for R-500 systems. It can also be used instead of MP39 for retrofit of R-12 in low-temperature stationary positive displacement systems such as commercial freezers where higher capacity is needed [works best <-15°F (-26°C) evaporator]. MP66 is also used in some R-12 transport refrigeration systems. Field experience has shown that no oil change is needed in many unitary and close-coupled systems.



R-401B; A1 Safety Classification


R-12 and R-500


  • Low-temperature R-12 stationary positive displacement systems for commercial freezers
  • R-12 transport


  • Works with existing Mineral Oil (MO) in many unitary and close-coupled systems.
  •  Alkylbenzene (AB) oil is recommended for optimum oil return.
  • One compressor oil change to AB will typically remove 50% to 80% of the existing MO, which satisfies the recommendations and requirements of most compressor manufacturers; 10% to 25% less refrigerant is needed. See retrofit guidelines for full details.

Phaseout Schedule

Consult the specific regulations in your country or region.

Lubricant Recommendation

AB or MO