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Tham khảo tài liệu 'control valve handbook episode 1 part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 107 Fluid Compatibility continued This table rates and compares the compatibility of elastomer material with specific fluids. Note that this information should be used as a guide only. An elastomer which is compatible with a fluid may not be suitable over the entire range of its temperature capability. In general chemical compatibility decreases with an increase in service temperature. KEY A Best Possible Selection A Generally Compatible B Marginally Compatible C Not Recommended - no data NOTE These recommendations are to be used as a general guide only. Full details regarding pressure temperature chemical considerations and the mode of operation must be considered when selecting an elastomer. FLUID ELASTOMER RATINGS FOR COMPATIBILITY WITH FLUID ACM ANM Polyacrylic AU EU Polyurethane CO ECO Epichloro -hydrin CR Chloroprene Neoprene 1 EPM EPDM Ethylene Propylene FKM Fluoroelastomer Viton 1 FFKM Perfluoroelastomer IIR Butyl VMQ Silicone NBR Nitrile Buna N NR Natural Rubber TFE P Tetrafluoro ethylenepropylene copolymer Steam C C C C B C A B C C C A Sulfer Dioxide Dry C - - C A - - B B C B - Sulfur Dioxide Wet C B - B A C A A B C C B Sulfuric Acid to 50 B C B C B A A C C C C A Sulfuric Acid 50-100 C C C C C A A C C C C A Suva HCFC-123 1 - C - A A B - A B C C Suva HFC134a 1 - - - B A C - B B A B - Water Ambient C C B A A A A A A A A A Water 200 F 93 C C C B C A B A B A C A - Water 300 F 149 C C C - C B C A B C C C - Water De-ionized C A - A A A A A A A A A Water White C B - B A A A A B B B - 1. Registered trademark of DuPont Performance Elastomers 2. Trademark of Dow Chemical Co. Chapter 5. Control Valve Selection Chapter 5. Control Valve Selection Service Temperature Limits for Non-Metallic Materials ASTM Designations and Tradenames Generic Description Temperature Range CR Chloroprene -40 to 180 F -40 to 82 C EPDM Ethylene propylene terpolymer -40 to 275 F -40 to 135 C FFKM Kalrez 1 Chemraz 2 Perfluoroelastomer 0 to 500 F -18 to 260 C FKM Viton 1 Fluoroelastomer 0 to .