Lubricants for R134a

The traditional mineral and synthetic oils are not miscible (soluble) with R134a and other HFCs described in the following and are therefore only insufficiently transported around the refrigeration circuit.

Immiscible oil can settle out in the heat exchangers and prevent heat transfer to such an extent that the system can no longer be operated.

New lubricants with appropriate solubility were developed and have been in practical use for many years. These lubricants are based on Polyol Ester (POE) and Polyalkylene Glycol (PAG).

For further explanations on lubricants: Lubricants for compressors.