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Old 05-13-18, 08:21 AM   #8
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The aftermarket natural refrigerant blends are a precision blend of propane and isobutane. Isobutane has a boiling point of around -10 degC where natural butane has a boiling point around 0 degC at sea level. Propane has a boiling point around -40 degC. What this means for the conversation here is that both types of butane do not develop enough vapor pressure compared to r134a, and propane develops too much vapor pressure. The care line of refrigerant is either a blend or pure propane isobutane. Care 30 is closest to r12 or 134 and is about half and half of each.
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