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2 Characteristics An important characteristic of many of the synthetic lubricants, such as POE and PAG oils, is that they are more hygroscopic than mineral oils as shown in the diagram below. They saturate at approximately 1000 ppm from atmospheric moisture, compared to about 100 ppm for mineral oils. The POE lubricants are considerably less hygroscopic than PAG lubricants. This diagram shows lubricant compatibility for some refrigerants. CFC-11 CFC-12 R-502 HCFC-22 HCFC-123 HFC-134a HFC-404A HFC-407C HFC-410A HFC-507A HC-600a HC-290 R-717 (NH3) R-744 (CO2) � � Refrigerant Appropriate Lubricant Mineral Oil (MO) Alkyl benzene Polyol Ester Poly alpha oelfin Poly alkyl glycol (AB) (POE) (PAO) (PAG) PAG 10 000 PPM POE 1000 PPM MINERAL 100 PPM �� �� �� �� �� � � � � � �� �� � � TIME (HOURS) Hygroscopy of POE and mineral lubricants : Good Suitability �: Application with limitations : Not Suitable Chapter 4 of this manual presents information about the problems moisture can create in a system, and how to deal with them. 52 MOISTURE CONTENT RefrigerantsPDF Image | Manual for Refrigeration Servicing Technicians
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