What kind of materials are good for oil sealing materials?
The commonly used materials for oil seals under high quality china oil seal design are: rubber, fluorine rubber, silicone rubber, acrylic rubber, polyurethane, polytetrafluoroethylene, etc.
Dingya rubber (NBR)
It has good heat resistance and abrasion resistance. It is resistant to various lubricant, grease, oil and gas mixture, etc. It is suitable for -30 ~ 120 degrees Celsius, but it cannot be phosphate. Use, stable performance in gasoline and lowine -point mineral oil.
Polyacrylate rubber (ACM)
Oil resistance and heat resistance, superior heat resistance, abrasion resistance, ozone resistance, ultraviolet radiation, especially lubricating oil, gear oil, motor oil, motor oil, petroleum hydraulic oil, etc., which are resistant to polar pressure agents. Scope of work.
Fluorine rubber (FPM)
Aging, heat -resistant, and oil -resistant, it is almost applicable to all lubricating oil, fuel oil, and gasoline. It is not easy to harden in the oil containing pole additives. At the temperature -20 ~ 250 degrees Celsius.
Silicone Rubber
It has outstanding high and low temperature, which can be used for a long time without performance changes at 150 degrees Celsius; 10000h can be used continuously at 200, and it can maintain its unique use of elasticity, ozone resistance, resistance to ozone, resistance to ozone, resistance to ozone, resistance, and resistance to-70 ~ 260. The advantages of the weather.
Polytefluoroethylene
It has outstanding chemical stability, thermal stability, reduction and self -lubricating properties, and its cracking temperature is above 400. Therefore, it can work normally within the temperature range of -200 ~ 300 degrees Celsius. In addition to free fluoride and alkaline metals, it has excellent corrosion resistance for chemicals, solvents, hydroxide compounds and acids.
Tado rubber and fluorine rubber materials are widely used in oil seal. The former cost is low, but the temperature resistance and sealing are significantly improved, but the cost is high, and it still has some adverse commonality of ordinary rubber materials, such as poor abrasion resistance. The life of the use of short service and the eccentric response to the axis is particularly sensitive, etc. The leakage is still common. PTFE oil seal is a product with high technical content and is the direction of oil seal development in the future.
When selecting the material of the oil seal, the compatibility of the material on the working medium, the adaptability of the working temperature range, and the ability to follow the rotating axis at high speed of the rotation axis. The temperature of the lip margin is higher than the temperature of the working medium at 20 ~ 50 ° C during the work medium, and you should pay attention when selecting the oil seal material. The working range of oil seal is related to the material used for oil seal: the material is -40 ~ 120 ° C at the time of the chores (NBR), the Alek rubber (ACM) -30 ~ 180 ° C, and the fluorine rubber (FPM) -25 ~ 300 ° C.
