O-ring as a small size, simple structure, easy to disassemble the sealing ring, has its own advantages, so the scope of application is more extensive, many industries are using O-ring.

The copolymerization of butadiene and acrylonitrile monomers via emulsion polymerization is based on the formula of molecular structure: - (CH2-CH=CH) m- (CH2-CH2- CH) n- CN. Nitrile rubber was first developed in Germany in 1930 and is a copolymer of butadiene and 25% acrylonitrile.

Tensile property is the first consideration for sealing materials.

Ethylene propylene ternary fire pipe card sealant ring, 63-65 Shaw A, 15MPA, constant pressure within 25% of the cost-effective rubber design.