Rubber gasket with steel core is a kind of rubber gasket with an carbon steel or stainless steel core which reinforced the gasket. Ovictor Group not only supply standard flat gasket & RF type rubber gasket with steel core but also accept customized size gasket orders.And client can choose different rubber material to meet different application.
Natural rubber (NR)
The vulcanized natural rubber has high elasticity, high mechanical strength, bending resistance, tear resistance, impact resistance, good corrosion resistance to alkali and dilute acid, non-polar solvent resistance, poor oil resistance, and easy aging under the action of oxygen and ozone.
The disadvantage of NR is not resistant to concentrated sulfuric acid and solvents. Natural rubber expands in non-polar solvents, and has poor oil and solvent resistance.
Nitrile rubber (NBR)
NBR is well know as its excellent oil resistance. Its oil resistance is second only to polysulfide rubber, polyacrylate rubber and fluororubber among the existing rubbers. It also has the mechanical strength and wear resistance required as a sealing material, and is widely used in various dynamic and static seals. The combination of NBR and PVC can further improve its ozone resistance, wear resistance and flame retardance. It can also improve its ozone resistance and low-temperature bending property when used with EPDM. The oil resistance and low temperature resistance of NBR have a great relationship with the content of acrylonitrile.
The disadvantage of NBR is not ozone resistant and is not suitable for insulation.
CR rubber is a self-reinforcing elastomer with polarity second only to nitrile rubber. Its physical and mechanical properties are similar to natural rubber, and its aging resistance and chemical corrosion resistance are better than natural rubber. It is a better type of general rubber. Oil resistance is inferior to natural rubber and superior to other general rubber. It is resistant to the corrosion of inorganic acids and alkalis, and is flame retardant rubber.
The disadvantage of CR is hardens at low temperature, has poor storage stability, poor electrical insulation, high density, and is difficult to control processing.
Ethylene propylene rubber (EPDM)
The EPDM has excellent ozone resistance, aging resistance and weather resistance, outstanding corona resistance of electrical insulation, and excellent corrosion resistance, especially in high-pressure water vapor. Therefore, it can be used as a gasket for high-pressure water vapor devices. Ethylene propylene rubber also has good stability for various polar chemicals, ethanol, ketone esters, and acid-base, phosphate ester working oils. And the price is cheap.
The disadvantage of EPDM is the curing time is very slow, and it is difficult to use with other rubbers. Its self-adhesion and inter-adhesion are very poor, and the difficulty of adhesion brings great difficulties to processing.
Silicone rubber (SI or Q)
Silicone rubber has a wide temperature range (- 100~+350 ℃), excellent resistance to oxygen, ozone aging, light aging and climate aging, good electrical insulation, high permeability, outstanding physiological inertia and mildew resistance. Special silicone rubber also has oil resistance, radiation resistance and combustion resistance. The disadvantages of silicone rubber are low strength, poor acid and alkali resistance, and high price.
The shortage of Silicone rubber is low tensile strength, tear resistance and poor wear resistance at room temperature. Universal silicone rubber also has large compression set, poor oil resistance, poor acid and alkali resistance, and is expensive. In order to make up for the shortage of general silicone rubber, fluorosilicone rubber, silicone rubber, phenyl silicone rubber and borosilicate rubber are also common.
Fluorine rubber (FPM)
Fluorine rubber has excellent oil resistance and high temperature resistance, which is comparable to silicone rubber. Its biggest feature is high corrosion resistance. Its stability to organic liquids (such as various oils, fuels, solvents, hydraulic fluids), high concentration hydrogen peroxide and other strong oxidants is better than other rubber. Domestic fluorine rubber is divided into two types, namely 23 type and 26 type fluorine rubber. The resistance of type 23 fluororubber to strong oxidizing acid is better than that of type 26, but the resistance to aromatic solvents, chlorinated organic solvents, fuel oil, hydraulic oil, grease lubricating oil and boiling water is worse than that of type 26.
The shortage of FPM is poor cold resistance, good electrical insulation, requiring secondary vulcanization, high shrinkage and high price.
Rubber gasket application: chemical, petrochemical, oil refining, chlor-alkali, acid making, phosphate fertilizer, pharmaceutical, pesticide, chemical fiber, dyeing, coking, gas, organic synthesis, food, beverage and other production and processing departments.