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See Chinese contents: GB/T 23658-2009 GB/T 23658-2009: Elastomer seals transport gas and hydrocarbon liquids in pipes and fittings with seal material requirements
This standard specifies the requirements for the delivery pipes and fittings, auxiliary devices, and elastomeric seals materials for the valves used for the following conditions which have a normal working temperature of -5 ~ +50 degree-Celcius and -15 ~ +50 degree-Celcius under special circumstances:
