Mineral oils are typically used with which type of refrigerant?

Mineral oils are typically used with CFCs because they have a good compatibility with the hydrocarbon compounds found in these refrigerants. CFCs, or chlorofluorocarbons, are non-polar substances that do not mix well with oils that have high polarity, such as synthetic oils or those designed for use with hydrofluorocarbons (HFCs) or hydrochlorofluorocarbons (HCFCs). This compatibility ensures optimal lubrication and efficiency in refrigeration systems using CFCs.

The other refrigerants, HFCs and HCFCs, generally require ester or synthetic oils for effective lubrication due to their differing chemical properties. HFCs are more polar compared to CFCs and typically don’t mix well with mineral oils, necessitating the use of specially formulated oils like PAG or POE. Hence, mineral oils are primarily suited for systems utilizing CFC refrigerants, making the option detailing their use with CFCs the correct choice in this context.