Polyol Ester based lubricants:

Polyol ester-based lubricants are known for their ability to absorb moisture from the atmosphere, a characteristic that is more pronounced than that of mineral oils. This property is significant in HVAC applications because moisture in a refrigerant system can lead to issues such as corrosion and reduced efficiency.

Polyol ester lubricants are often hygroscopic, meaning they can attract and hold onto water molecules, which can pose a challenge during system operation and maintenance. Therefore, understanding that they absorb moisture more rapidly helps technicians recognize the importance of maintaining proper moisture levels in refrigerant systems using these lubricants.

This characteristic is one of the critical considerations when selecting lubricants for refrigeration applications, as it impacts system performance and durability.