Here are some of the characteristics of POE oils-
• They are completely wax-free unlike mineral oils.
• They also offer better thermal stability, and are more compatible with HFC refrigerants than mineral oils.
• POE oils are also highly biodegradable.
• POEs can withstand a wide temperature range. They provide maximum protection and lubrication at higher compressor temperatures.
• These lubricants contain no extra anti-wear additives.
• They are compatible with existing mineral oil and alkyd benzene lubricants; this makes them suitable for retrofit projects.
• POE oils are available in various types and grades. There will be variation in lubricity, viscosity, miscibility with refrigerants, additive packages, pour point, and moisture content. Therefore it is always recommended to check the specifications of the compressor manufacturer about the type of POE oil required.
• POE oils have hygroscopic properties. When they come into contact with air they will absorb moisture more quickly than mineral oil. As a result using this oil lead to permeation of moisture in the system which will in-turn result in acidic build-ups. So sealed cans of POE oils should be opened by the technician only when they will be actually used.