Industry News

Brief description of several materials for non-metallic gaskets

2019-02-15
1.Neoprene CR

Neoprene is a synthetic rubber that is suitable for corrosion of acids, bases and salt solutions that are resistant to moderate corrosion. Good corrosion resistance to commercial oils and fuels. However, the corrosion resistance of strong oxidizing acids, aromatic hydrocarbons and chlorinated hydrocarbons is poor. Recommended operating temperature -51 ° C ~ 121 ° C.

2. Natural rubber NR

It has good corrosion resistance to weak acids and bases, salt and chloride solutions, and poor corrosion resistance to oils and solvents. It is not recommended for ozone media. Recommended operating temperature -57 ° C ~ 93 ° C.

3. Butadiene cyanide rubber NBR

Butadiene cyanide rubber is a synthetic rubber that is suitable for corrosion resistance to oils, solvents, aromatic hydrocarbons, alkaline hydrocarbons, oil and natural gas over a wide temperature range. Good corrosion resistance to hydroxides, salts and near-neutral acids. However, in strong oxidizing medium, chlorinated hydrocarbons, ketones and lipids, the corrosion resistance is poor. The recommended working temperature is 51 ° C ~ 121 ° C.

4. Chlorosulfonated polyethylene synthetic rubber

It 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. It does not apply to aromatic hydrocarbons, chlorinated hydrocarbons, chromic acid and nitric acid. Recommended operating temperature -45 ° C ~ 135 ° C.

5. Silicone rubber

Silicone rubber has outstanding high and low temperature resistance and can be used for ultra long-term use at 150 °C without performance change. It can be used continuously for 10,000 hours at 200 °C, and can maintain its unique use elasticity within the working temperature range of -70 to 260 °C. And ozone-resistant, weather-resistant and other advantages, suitable for the production of sealing gaskets required in thermal mechanisms, such as sealing gaskets, valve gaskets, oil seals (for water media), etc., special silicone rubber can be used to make oil seals.

6. Ethylene propylene rubber

Good corrosion resistance to strong acids, strong bases, salts and chloride solutions. It does not apply to oils, solvents, aromatic hydrocarbons and hydrocarbons. Recommended operating temperature -57 ° C ~ 176.

7. Fluororubber

The fluororubber compound is obtained by mixing a binary and ternary fluorogenic rubber with a compounding agent and a vulcanizing agent. In addition to excellent heat resistance, medium resistance, and good physical and mechanical properties, it also has low compression set, good elasticity and long service life. Fluororubber has outstanding heat resistance (200 ~ 250 ° C), oil resistance, can be used in the manufacture of cylinder liner seals, plastic bowls and rotating lip seals, can significantly improve the use of time. Recommended operating temperature is -40 ° C ~ 232 ° C.

8. Graphite

The material is free of resin or inorganic materials and can be classified into a metal with or without a metal element. The material can be bonded to make pipe gaskets over 600 mm in diameter. It has excellent corrosion resistance to many acids, bases, salts and organic compounds and heat transfer solutions, even high temperature solutions. It does not melt, but it will sublimate beyond 3316 °C. In high temperature conditions, the use of this material in a strong oxidizing medium should be cautious. In addition to being used for gaskets, this material can also be used to make non-metallic wound tapes in fillers and wound gaskets.

9. PTFE

It combines the advantages of most plastic gasket materials, including temperature resistance from -95 ° C to 232 ° C. In addition to free fluorine and alkali metals, it has excellent corrosion resistance to chemicals, solvents, hydroxides and acids. PTFE materials can be filled with glass to reduce the cold flow and creep of PTFE.

10. Ceramic fiber

The ceramic fiber formed on the strip is an excellent gasket material suitable for high temperature and low pressure working conditions and light flange conditions. The recommended working temperature is 1093 ° C, and the non-metallic winding tape in the wound gasket can be made.