based blend, with R-124 to cut pressure and hydrocarbon R-600
(butane) to improve oil return. This blend matches R-12 pressures
at condenser temperatures, and pressures in the evaporator
will need to be a few psi lower than R-12 to maintain proper
temperature. There is a low temperature glide. Although the
blend does not mix with mineral oils the addition of hydrocarbon
thins the oil for satisfactory oil return. Systems will experience
a loss of capacity, especially at lower temperatures.