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See Chinese contents: HG/T 20632-2009 HG/T 20632-2009: Covered serrated metal gaskets for use with steel pipe flanges (Class designated)
This standard specifies the type, dimension, technical requirements, marking and sign of combined covered serrated gasket for use with steel pipe flanges (Class designated). This standard is applicable to the covered serrated metal gaskets for use with steel pipe flanges whose nominal pressures are from C1assl50 (PN20)-C1ass2500 (PN420) which are specified in HG/T 20615 and HG/T 20623.
