R600a is the possible replacement for other refrigerants, which have high impact on environment in small hermetic systems, like factory made household and commercial refrigerator and freezer.
It is zero ODP and a negligible GWP. Furthermore, it is part of petrol gas from natural sources.

Replace  
R12

Applications
Domestic refrigerators
Freezer
Benefits
Environment friendly
Works with the existing lubricants MO and AB