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Polyolester
Polyolester oil (POE oil) is a type of synthetic oil used in refrigeration compressors that is compatible with the refrigerants R-134a, R-410A and R-12.〔(Definition of POE oil )〕 It is recommended by experts as a replacement for hydrofluorocarbons (HFCs). Along with R-134a mineral oil it is recommended as a replacement for R12 mineral oil as R134a does not mix well with mineral oil. These wax-free oils are suggested for use with chlorine free HFC systems as they provide better lubrication and stability and are more miscible with HFC refrigerants. They can meet the lubricity requirements to those of mineral oils used with CFCs and HFCs. They are compatible with most lubricants in the market.〔(【引用サイトリンク】 title=Polyolester Oils: Handling the New Lubricant in R-410A Systems )〕 It is noted that the viscosity of the oil increases with temperature. The dispersion behavior of this oil has also been the subject of a lot of study. It is also considered by some to be a good additive to engine oil.
==Use==
The use of this type of oil is in the process of being phased-in by manufacturers who use compressors in their products. The need to replace the old oils has arisen due to environmental restrictions causing incompatibility of the old oils with the new refrigerants. POE oils are very good solvents and easily dissolve most of the residual mineral oils that they may be replacing. So even though small amounts of the old oil may remain, it won't clog the system.
Polyolester oil is used exclusively in jet turbine engines and often used in moving picture film cameras.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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