ASME is The American Society of Mechanical Engineers. Their codes and standards, publications, conferences, continuing education, and professional development programs provide a foundation for advancing technical knowledge and a safer world.

ASME B16.21 - 2016 Nonmetallic Flat Gaskets for Pipe Flanges covers types, sizes, materials, dimensions, tolerances, and markings for nonmetallic flat gaskets. These gaskets are dimensionally suitable for use with flanges described in the referenced flange standards.

Published in 2016, this is the most up-to-date guide for the industry.