Differences In Raw Materials Of Rubber Connector Seals

The rubber materials used for rubber connector seals are different due to the different requirements of the environment and the index of the occasion. The materials for rubber oil seals include natural rubber, nitrile rubber, fluorine rubber, acrylate rubber, and hydrogenated nitrile rubber, etc.

Natural rubber

Compared with most synthetic rubber, natural rubber has good overall mechanical properties, cold resistance, high resilience, and wear resistance. Natural rubber is not resistant to mineral oil but is more stable in vegetable oil and alcohol.

Nitrile rubber

Very commonly used materials in the production of seals, oil-resistant sealing products using nitrile rubber are the main.

NBR has excellent resistance to fuel oil and aromatic solvents and other properties, ordinary requirements can be met, the cost is low.

Fluorine rubber

Fluorine rubber (fluoro rubber) is a synthetic polymer elastomer containing fluorine atoms on the carbon atoms of the main chain or side chain.

Advantages of fluorine rubber: in rubber sealing materials, its heat resistance (decomposition temperature greater than 400 degrees Celsius), oil resistance (a variety of fuel, hydraulic oil, lubricating oil, synthetic oil), solvent resistance, weather resistance (resistance to this line, ozone resistance, radiation resistance), chemical media resistance is the best, all table nitrile rubber, polyurethane rubber can not be used in a high-temperature environment or special working fluid, are available fluorine rubber as the seals Fluoroelastomer is a material that is not spontaneously combustible, non-combustible, self-extinguishing in case of fire, has good physical and mechanical properties, is the best comprehensive force of all synthetic rubber, commonly known as "King of Rubber" has become one of the indispensable and alternative basic materials for modern industry, especially in the field of high technology.

The disadvantages of fluorine rubber: its processing performance is not easy to master, the price is higher, the splendor is 20 times worse than nitrile rubber, cold resistance, water resistance is poor, the elasticity at room temperature is poor, the market has developed cold resistance, water resistance to improve the fluorine rubber products, there are also resistance and chemical resistance better than the ordinary fluorine rubber FFKM, but the price is 10 times higher than fluorine rubber.

Application of fluoroelastomer seals

Fluoroelastomer is widely used in national defense, military, automotive and aviation, aerospace, and petroleum fields. Fluoroelastomer oil seals are also used in drilling machinery, oil refining equipment, natural gas desulfurization devices, which can simultaneously withstand high temperature and pressure oil and strong corrosive media and other harsh conditions, in the chemical field fluoroelastomer oil seals are used in pumps, pipe connectors, equipment containers, used to seal inorganic acids, chemicals, etc. In the military industry, fluoroelastomer is mainly used in aerospace, aviation, and carrier rockets, satellites, fighter jets, new tank oil seals, oil pipes, and electrical circuit sheathing, etc. It is one of the key seal materials that cannot be replaced in the defense cutting-edge industry.

Acrylate rubber

The comprehensive performance of heat and oil resistance of acrylate rubber is excellent, and the use temperature can be as high as 180℃-200℃, which is widely used in products requiring high temperature and heat resistance.

Acrylic ester rubber is called automotive rubber, is the manufacture of high-temperature rubber oil seals, O-rings, gaskets, and hoses of suitable materials, is an important material in the automotive industry.

Acrylic rubber also has many other excellent properties - ozone resistance, flexing resistance, sunlight aging resistance, good airtightness, rubber transparency, and good fabric adhesion.

The application areas of acrylate rubber are quite wide - sponge products, deep good exploration, partial replacement of silicone rubber in the electrical industry, in adhesives.

Hydrogenated nitrile rubber

This special hydrogenation process reduces many of the double bonds on the main chain of NBR polymer. Therefore, in addition to retaining the characteristics of the original NBR, hydrogenated NBR has a higher degree of heat resistance, ozone aging resistance, heat resistance, chemical resistance, and mechanical properties than NBR.

Like NBR, an increase in acrylonitrile (ACN) content increases resistance to petroleum-based oils and fuels but decreases its low-temperature performance. The acrylonitrile content usually ranges from 18% to 50%. Hydrogenated NBR fills the gap between NBR and fluoroelastomers in many applications.

While fluoroelastomers have proven to have excellent resistance to crude oil and process oils, test results have also shown that they deteriorate rapidly when placed in modern oil wells containing small amounts of amine corrosion inhibitors, and have therefore been replaced by hydrogenated NBRs.

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