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According to the role of the auxiliary sealing ring it plays, the auxiliary sealing ring materials of the mechanical seal are required to have good elasticity, low friction coefficient, corrosion resistance to the medium, dissolution and swelling resistance， aging resistance, and small permanent deformation after compression and long-term work. They are also required to have non-adhesiveness when used at high temperature, and not hard and brittle and loses elasticity at low temperature, and has certain strength and compression resistance.
1.Synthetic rubber
As a kind of widely used auxiliary sealing materials, attention should be paid to the selection of different types of rubber for they have different degrees of corrosion resistance, solvent resistance and temperature resistance properties.Synthetic rubbers commonly used for auxiliary seals of mechanical seals include nitrile rubber (NBR), fluororubber (FPM), ethylene-propylene rubber (EPM), and silicone rubber.
As a kind of widely used auxiliary sealing materials, attention should be paid to the selection of different types of rubber for they have different degrees of corrosion resistance, solvent resistance and temperature resistance properties.Synthetic rubbers commonly used for auxiliary seals of mechanical seals include nitrile rubber (NBR), fluororubber (FPM), ethylene-propylene rubber (EPM), and silicone rubber.
1.1Nitrile rubber
Nitrile rubber is the most commonly used auxiliary sealing ring material of mechanical seals. It is famous for its excellent oil resistance and aging resistance, and also has good wear resistance.The performance of nitrile rubber is related to the content of acrylonitrile. Higher acrylonitrile content leads to good oil resistance, increased strength, hardness, wear resistance and water resistance, but poor corrosion resistance, elasticity and low temperature resistance. Auxiliary sealing rings generally use nitrile rubber with medium and high acrylonitrile content (acrylonitrile content is 26¯40%, namely nitrile-26, nitrile-40), especially nitrile-40 rubber is the most widely used, but in working conditions where low temperature is the usual case type of nitrile rubber should be nitrile-26 rubber.Nitrile rubber has excellent corrosion resistance to mineral oil, animal and vegetable oil, and aliphatic hydrocarbons, but it is worth noting that it is not resistant to phosphate ester hydraulic oil, strong acids, aromatics, esters, ketones, ethers, halogenated hydrocarbons, etc. Corrosion of the medium.
Nitrile rubber is the most commonly used auxiliary sealing ring material of mechanical seals. It is famous for its excellent oil resistance and aging resistance, and also has good wear resistance.The performance of nitrile rubber is related to the content of acrylonitrile. Higher acrylonitrile content leads to good oil resistance, increased strength, hardness, wear resistance and water resistance, but poor corrosion resistance, elasticity and low temperature resistance. Auxiliary sealing rings generally use nitrile rubber with medium and high acrylonitrile content (acrylonitrile content is 26¯40%, namely nitrile-26, nitrile-40), especially nitrile-40 rubber is the most widely used, but in working conditions where low temperature is the usual case type of nitrile rubber should be nitrile-26 rubber.Nitrile rubber has excellent corrosion resistance to mineral oil, animal and vegetable oil, and aliphatic hydrocarbons, but it is worth noting that it is not resistant to phosphate ester hydraulic oil, strong acids, aromatics, esters, ketones, ethers, halogenated hydrocarbons, etc. Corrosion of the medium.
In the next article, we will mainly talk about other types of rubber in synthetic rubber adopted as the auxiliary sealing materials of mechanical seals.
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