Non-Metal Sealing RF/FF ASME B16.21 Asbestos Free Gasket

Non-asbestos gasket is made from special non-asbestos heat-resisting fiber, natural rubber compound heating and compression molding. It eliminates asbestos rubber sheet essentially and thoroughly. The maximum dimension reach 2700 x 2700mm.

Non-Asbestos Fibre materials are so-called because they fill the gap in the range of gasket materials previously occupied by asbestos. Asbestos, although now known to be a dangerous material, had excellent heat resistance properties, which is why it was utilised so widely in high temperature applications. When asbestos was outlawed, replacement materials were needed; and so these asbestos-free, or non-asbestos, materials were developed to perform the same function, but without the corresponding danger to human health.
 

These materials are now commonly comprised of aramid fibre (Kevlar) and non-organic fibres, which are in turn blended with different polymers to meet different applications: most commonly nitrile rubber, for fuel and oil resistance. These materials can also be graphite coated for non-stick and steam resistance, mixed with PTFE for excellent chemical resistance, or with EPDM for potable water applications.
 

Common Industries Utilising Non-Asbestos Fibre, Non-asbestos Gasket
 

· Oil and Gas

· Chemical Processing

· Petrochemical Industry

· Process Industry

Dimensions of Non-Metallic Flat Gaskets, ASME B16.21 to be used with Raised Face flanges ASME b16.5

 Gasket Dimension




 

Class 150 to 900 NPS 1/2 to 24

General notes:

· Dimensions are in millimeters unless otherwise indicated.

· d1 = Inside diameter.

· d2 = Outside diameter.

· Dimensional tolerances outside diameter NPS 12 and smaller: +0 / -1.5 mm.

· Dimensional tolerances outside diameter NPS 14 and larger: +0 / -3.0 mm.

· Dimensional tolerances inside diameter NPS 12 and smaller: ± 1.5 mm.

· Dimensional tolerances inside diameter NPS 14 and larger: ± 3.0 mm.

· Thickness (t) specified by customer.