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Performance and construction of gaskets

Dec 30, 2019

Asbestos rubber sheet is made of asbestos, rubber and filler. According to its formula, process, performance and application, there are mainly high-pressure asbestos rubber plates, medium and low-pressure asbestos rubber plates and oil-resistant asbestos rubber plates.

There are two types of asbestos materials for making asbestos rubber plates: chrysotile and blue asbestos. Chrysotile asbestos belongs to serpentine asbestos. Its main component is about 13% of magnesium silicate in crystal water. It is heat resistant, alkali resistant, high tensile strength, and poor acid resistance. Most asbestos rubber sheets are made of It makes. Blue asbestos belongs to the amphibole type asbestos. The main component contains silicates with 2.5 to 3.5% crystal water. Magnesia blue asbestos has good continuous heat resistance and acid resistance, so it is mostly used to make acid-resistant asbestos rubber sheets.

The quality of asbestos fiber affects the performance of asbestos rubber sheet. Toughness is required, so asbestos fiber is required to have high tensile strength, good heat resistance, a certain length, easy bending and elasticity of the fiber. General high-pressure asbestos rubber sheets and 400 oil-resistant asbestos rubber sheets use grades 2 and 3 asbestos fibers.

Because asbestos is a loose material, there are still a lot of impurities inside after pressing into the board. A certain amount of rubber (as a joint) and various fillers should be added to make asbestos rubber board. The added fillers and fillers can be plugged in general, asbestos fiber accounts for 60 ~ 85%.