Non Metallic Flat Gaskets

At Goodrich Gasket the following information shall be included in markings: manufacturer’s name or trade mark or material designation. Gaskets shall be packaged with NPS, class, gasket manufacturer’s name, material designation, thickness and ASME B16.21 marked or tagged on the package or the gasket. At the option of the manufacturer the DN designation may be included.
NPS followed by a dimensionless number is the designation for nominal pipe size as described in ASME B36.10M and is related to the reference nominal diameter DN used in international standards. Class followed by a dimensionless number is the designation for common flange pressure-temperature ratings as given by the referenced flange standards.