Forum Discussion
DFord
Feb 08, 2020Explorer
Both Butane (R-600a) and Propane (R-290) make excellent refrigerants. They have a zero factor of ozone depletion and are very good at returning lubricating oil back to the compressor that gets past the rings. Of course the BIG problem is their flammability.
At 0 psig Propane boils at -42C degrees (-44F) while Butane boils at -0.4C degrees (31F). Isobutane boils at -11.75C degrees (11F). So you can see, propane is much better for colder climates. It's possible to get the tank cold enough for it go into a vacuum - very undesirable!
Butane vs Propane vs Isobutane - What is Butane?
Here's a chart showing the pressure/temperature of mixtures of butane and propane.
Propane Butane Mixtures - Evaporation Pressures
At 0 psig Propane boils at -42C degrees (-44F) while Butane boils at -0.4C degrees (31F). Isobutane boils at -11.75C degrees (11F). So you can see, propane is much better for colder climates. It's possible to get the tank cold enough for it go into a vacuum - very undesirable!
Butane vs Propane vs Isobutane - What is Butane?
Here's a chart showing the pressure/temperature of mixtures of butane and propane.
Propane Butane Mixtures - Evaporation Pressures
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