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See Chinese contents: HG/T 20606-2009 HG/T 20606-2009: Non-metallic flat gaskets for use with steel pipe flanges (PN designated)
This national standard specifies the pattern, dimension, technical requirements and marking of non-metallic flat gaskets (with or without insertion) for use with steel pipe flanges (PN designed). This Standard is applicable to non-metallic flat gaskets for use with steel pipe flange in nominal pressure of PN2.5~PN63 specified in HG/T 20592.
