Gasket material? The role of materials?
Asbestos. Asbestos material has two kinds: wet asbestos and blue asbestos. Wet asbestos, heat resistance, good alkali resistance, high tensile strength, acid resistant performance is poor, the majority of asbestos rubber plate made from it; not only blue asbestos, good heat resistance, and acid resistance is also very good, so it is used in the manufacture of acid resistant asbestos rubber sheet. The normal use temperature of asbestos board is below 550 degrees. An asbestos or asbestos rope may be used for a larger pressure vessel. When asbestos ropes are used, they are usually impregnated with water glass. Acid, alkali, solvents and other media can also use such gaskets. Asbestos rubber sheet. Asbestos rubber sheet is made of asbestos, rubber and stuffing. Asbestos fiber generally accounts for 60%-85%. According to its distribution process, performance and application of different, mainly high-pressure asbestos rubber sheet, medium and low pressure asbestos rubber sheet and oil resistant asbestos rubber sheet. Asbestos rubber sheet has the properties of proper strength, elasticity and softness, and it is convenient and cheap to make gaskets. Therefore, it has been rapidly popularized and applied in chemical enterprises. Flexible graphite.
There are many kinds of gaskets, which are divided into three major categories: nonmetal, semi metal and metal gasket. A non metal gasket. The non-metallic gasket is soft, corrosion resistant and cheap, but it has poor resistance to heat and pressure. Flange seal for medium and low pressure vessels or pipes used at normal temperature and medium temperature. Non-metallic gaskets include rubber mats, asbestos pads, asbestos rubber mats, flexible graphite pads and PTFE mats. Rubber sheet. The main materials for making rubber plate gaskets are natural rubber, nitrile rubber and chloroprene rubber. In addition, special rubber, such as fluorine rubber, has also begun to be applied. Rubber has compact structure, soft texture, good elasticity, easy to cut into various shapes, sealing and cheap, Tesco and other characteristics have been widely used in the container and the pipeline, but it is not high in mineral oil, easy to dissolve and expansion and is easy to corrosion, aging at high temperature, loss of resilience of.
