The hardness of rubber compounds is measured by the Shore A durometer; the higher the durometer, the harder the compound. Softer compounds stretch easier and seal better on rough surfaces. Harder compounds offer greater abrasion resistance and resistance to extrusion.

3 8 16 to 5 16 18 studsize

Utilized in applications which expose seals to high temperature dry heat. Not recommended for dynamic applications due to relatively poor tensile and tear strength. Best low temperature flexibility of all elastomers and can be used in static applications to -150°F.