The material selected for the packing of the packing determines the sealing effect of the packing. Generally, the packing material is limited by the working medium temperature, pressure and pH, and the surface roughness of the mechanical equipment working on the packing is eccentric. And the line speed, etc., will also require the material selection of the packing.
Any choice of packing material will have some basic material properties. The material from which the packing is made should have higher chemical stability, temperature resistance and impermeability to accommodate most working media. At the same time, the packing material should have better elasticity and self-lubricating ability, and the material of the packing should be reasonably priced and convenient to manufacture.