Refrigerant R 600a – isobutane and R 290 – propane are possible replacements for other re-
frigerants, which have high impact on environment, in small hermetic systems, like factory
made household and commercial refrigerators and freezers. They have zero ozone depletion
potential ODP and a neglectible global warming potential GWP. Furthermore they are part of
petrol gases from natural sources.
The refrigerant R 600a has been in use in the past,