The main materials of non-metallic gaskets are as follows:

1. Natural rubber NR.

Natural rubber NR has good corrosion resistance to weak acid and alkali, salt and chloride solution, but poor corrosion resistance to oil and solvent, so it is not recommended to be used in ozone medium. The recommended working temperature is-57 ℃ ~ 93 ℃.

2. Neoprene CR.

Chloroprene is a kind of synthetic rubber that is suitable for medium corrosion resistance in acid, alkali and salt solutions. It has good corrosion resistance to commercial oil and fuel. However, the corrosion resistance of strong oxidizing acids, aromatic hydrocarbons and chlorinated hydrocarbons is poor. The recommended working temperature is-51 ℃ ~ 121 ℃.

3. Fluorine rubber.

Fluororubber has good corrosion resistance to oil, fuel, chloride solution, aromatic hydrocarbons and lipids, hydrocarbons and strong acids, but it is not suitable for amines, lipids, ketones and steam, and the recommended working temperature is-40 ℃ ~ 232 ℃.

4. Chlorosulfonated polyethylene synthetic rubber.

Chlorosulfonylated polyethylene synthetic rubber has good corrosion resistance to acid, alkali and salt solutions, and is not affected by climate, light, ozone, commercial fuels such as diesel and kerosene. But it is not suitable for aromatic hydrocarbons, chlorinated hydrocarbons, chromic acid and nitric acid. The recommended working temperature is-45 ℃ ~ 135 ℃.

5. Silicone rubber.

Silicone rubber has good corrosion resistance to hot air. Silicone rubber is not affected by sunlight and ozone. But Wang is suitable for steam, ketones, aromatic hydrocarbons and lipid hydrocarbons.

6. Ethylene propylene rubber.

Ethylene propylene rubber has good corrosion resistance to strong acid, strong alkali, salt and chloride solution. But not suitable for oils, solvents, aromatic hydrocarbons and hydrocarbons. The recommended working temperature is-57 ℃ ~ 176.

7. Graphite.

Graphite this material does not contain resin or inorganic materials, can be divided into metal-doped or non-metal-doped graphite materials. The material can be bonded to make pipe gaskets with diameters larger than 600MM. It has excellent corrosion resistance to many acids, bases, salts, organic compounds and heat transfer solutions, even high temperature solutions. It cannot melt, but it will sublimate when it exceeds 3316 ℃. Under the condition of high temperature, the material should be used with caution in a strong oxidizing medium. In addition to being used for gaskets, this material can also be used to make non-metallic winding tapes in fillers and winding gaskets.

7. Ceramic fiber.

Ceramic fiber formed in strip is a kind of excellent gasket material suitable for high temperature, low pressure and light flange conditions. the recommended working temperature is 1093 ℃, which can be used to make non-metallic winding tape in winding gasket.

8. Polytetrafluoroethylene.

PTFE combines the advantages of most plastic gasket materials, including temperature resistance from-95 ℃ to 232 ℃. In addition to free fluorine and alkali metals, it has excellent corrosion resistance to chemicals, solvents, hydroxides and acids. PTFE material can fill glass, and its purpose is to reduce the cold flow and creep of PTFE.