Mineral oils are compatible with which types of refrigerants?

• A. All HFCs
• B. All CFCs
• C. All HCFCs
• D. All refrigerants

Answer: (B)

Mineral oils are compatible with all chlorofluorocarbons (CFCs) due to the chemical properties of both the oils and the refrigerants. CFCs are non-polar substances that mix well with the non-polar mineral oils, making them suitable for use in refrigeration systems that utilize CFCs. This compatibility is essential as it ensures proper lubrication and operation of the compressor within the cooling system.

In contrast, HFCs (hydrofluorocarbons) and HCFCs (hydrochlorofluorocarbons) generally require synthetic oils, such as POE (polyol ester) oils or PVE (polyvinylether) oils, because they are more polar and do not mix well with mineral oils. As a result, while mineral oils function effectively with CFCs, they would not provide the necessary performance when used with HFCs or HCFCs. Understanding this compatibility is crucial for maintaining the efficiency and longevity of refrigeration systems.