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viton rubber seat with aluminum back ring rubber valve seat Thisrubberseat has generally rubber incomparable advantages, which has many special outstanding performance, widely used in petrochemical, chemical, machinery, automobile, light industries,etc. high temperature resistant performance:the seat has excellent high temperature resistant performance in 250 oC, aging resistance. chemical resistance: one of the rubberseat characteristics isexcellent chemical resistance, it to organic liquid, acid and alkali, oil and other chemical stability than other rubber. size : sizes rangings from 2 inches to 24 inches, if exceed 24 inches, it must be aluminum back. Medium: applicable to most medium long service timeMaterials: rubber: Fluoro RubberBackring:Aluminum Sizes :1.5"- 48" We have got the WRAS and ISO9001 Certificate. The excellent performance products whose materials must be excellent and have first-class production formula, so the customer should provide the full use of environmental requirements, we will formulate it to meet requirements.