Soft gaskets or nonmetallic gaskets are normally used on Raised Face flanges (self-centering flat ring type gasket) and on Flat Face flanges (full face type gaskets are required). These types of gaskets are from sheets that were cut into different sizes and shapes in accordance to customer specifications and requirements. Construction for dimensions of nonmetallic gaskets shall be manufactured in accordance with ASME B16.21, ASME B16.47 Series A and ASME B16.47 Series B.
Soft gaskets and sheets are made from a wide-range of non-metallic and non-asbestos material as follows:
Aramid, Inorganic, Non Asbestos etc. with elastomeric binder
Water Chlorine Strong Acids Strong Caustics Moderate Acids & Caustics Steam Hydrocarbon Cryogenics Glass-Lined Equipment for chemical processing & services
Nitrile/Buna-N/NBR, EPDM/EPM, Neoprene, Silicone/FKM, and Fluoroelastomer/Viton, etc. for general application