How to select the sealing gasket? There are 8 categories of gasket selection analysis

作者： 1 时间：2023-02-04 11:17:34 阅读：182

There are many kinds of sealing gaskets, different materials, different shapes of gaskets have different roles. If you choose the wrong gasket, not only can not be a good seal, but also may become a security risk, there is always the possibility of danger. Do you know what gaskets are and what are their characteristics?

Industrial Rubber Sheet

Natural Rubber is suitable for water, sea water, air, inert gas, alkali, salt water solution and other media, but not resistant to mineral oil and non-polar solvents, long-term use temperature not more than 90 ° C, low temperature performance is excellent, can be used above -60 ° C. Nitrile-butadiene rubber is suitable for petroleum products, such as petroleum, lubricating oil, fuel oil, etc. . Long-term use temperature is 120 ° C, such as in hot oil can withstand 150 ° c, low temperature is -10 ~ -20 ° C. Neoprene is suitable for seawater, weak acid, weak base and salt solution, it has excellent aging resistance to oxygen and ozone, oil resistance is inferior to nitrile rubber and superior to other general rubber, and long-term use temperature is below 90 ° C, the maximum operating temperature is not more than 130 ° C, and the low temperature is -30 ~ -50 ° C.

Fluorine rubber has many varieties, they have good acid resistance, oxidation resistance and oil resistance, solvent resistance. It can be used in almost all acid media and some oils and solvents, long-term use temperature below 200 °C. Rubber sheet as flange gasket, mostly used for pipe or often disassembled manhole, hand hole, pressure does not exceed 1.568 mpa. Because in each kind of gasket, the rubber gasket is the softest, the fitting performance is good, can play the sealing effect under the small preload. As a result, when under internal pressure, because the gasket thickness or low hardness and easy to be extruded. Rubber sheet in benzene, ketone, ether and other organic solvents used, easy to appear swelling, weight gain, softening, sticky phenomenon, resulting in seal failure. General swelling degree more than 30% can not be used. Under the condition of low pressure (especially under 0.6 mpa) and vacuum, it is more suitable to use rubber pad. The rubber material has good compactness and low air permeability. For example, fluorine rubber is the most suitable sealing gasket for vacuum vessel, the vacuum degree can be up to 1.3 × 10 -7 pa. When the rubber pad is used in the vacuum range of 10 -1 ~ 10 -7 pa, it needs baking and air extraction.

Asbestos rubber sheet