OEM Rubber Hydraulic Repair Kit , Multifunctional Silicone O Ring

buna silicon o-ring o ring seals rubber o ring

Commonly used materials for oil seals include: nitrile rubber, fluorine rubber, silicone rubber, acrylic rubber, polyurethane, polytetrafluoroethylene, etc.
Nitrile rubber (NBR)

It has good heat resistance and wear resistance, and is resistant to various lubriTQing oils, greases, oil-gas mixtures, etc., and its applicable temperature is -30~120 degrees Celsius, but it cannot be used in phosphate ester hydraulic oil and gear oil containing extreme pressure additives. It is used in gasoline and has stable performance in gasoline and low aniline point mineral oil. 
Polyacrylate rubber (ACM)
Excellent oil resistance and heat resistance, wear resistance, ozone resistance, ultraviolet radiation resistance, especially resistance to lubricants, gear oils, motor oils, engine oils, petroleum-based hydraulic oils containing extreme pressure liquids, etc., suitable for -30~150 degrees Celsius Scope work.
fluororubber
It is resistant to aging, heat and oil, and is suitable for almost all lubriTQing oils, fuel oils and gasolines. It is not easy to harden in oils containing extreme pressure additives, but has poor cold resistance and high temperature wear resistance and large permanent compression deformation. It is suitable for At temperature -20~250 degrees Celsius.
Silicone Rubber
It has outstanding high and low temperature resistance and can be used for a long time at 150 degrees Celsius without performance changes; it can be used continuously for 10,000 hours at 200 degrees Celsius, and can maintain its unique use flexibility and resistance to ozone and resistance in the operating temperature range of -70 to 260 degrees Celsius. Weather and other advantages.
PTFE
It has outstanding chemical stability, thermal stability, friction reduction and self-lubriTQing properties, and its pyrolysis temperature is above 400. Therefore, it can work normally within the temperature range of -200~300 degrees Celsius. In addition to free fluorine and alkali metals, it has excellent corrosion resistance against chemicals, solvents, hydroxides and acids.
Nitrile rubber and fluorine rubber materials are widely used oil seals. The former is low in cost, but its temperature resistance and sealing performance are significantly improved. However, the cost is higher, and it still has some undesirable common characteristics of ordinary rubber materials, such as poor wear resistance. , short service life, particularly sensitive to the eccentric reaction of the shaft, etc., leakage is still relatively common. PTFE oil seal is a product with high technical content and is the future development direction of oil seals.
When selecting the material of the oil seal, you must consider the material's compatibility with the working medium, its adaptability to the operating temperature range, and the ability of the lip to follow the rotating shaft when it rotates at high speed. Generally, when the oil seal is working, the temperature of its lip is 20~50℃ higher than the temperature of the working medium. This should be paid attention to when selecting the oil seal material. The working range of the oil seal is related to the material used in the oil seal: -40~120℃ when the material is nitrile rubber (NBR), -30~180℃ for acrylic rubber (ACM), and -25~300℃ for fluorine rubber (FPM).

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