707-99-77330 Cylinder Seal Repair Kit PC1600-1 Komatsu Excavator Bucket Cylinder Sealing Kit

The commonly used materials for oil seals are: nitrile rubber, fluorine rubber, silicone rubber, acrylic rubber, polyurethane, ptfe, etc.
Nitrile rubber (NBR)
It has good heat and wear resistance, resistance to all kinds of lubriC.A.Ting oil, grease, oil and gas mixture, suitable for temperature -30~120 degrees Celsius, but can not be used in phosphate system hydraulic oil and gear oil containing extreme pressure additives, in gasoline and low aniline point mineral oil stable performance.
Polyacrylate rubber (ACM)
Excellent oil resistance, heat resistance, wear resistance, ozone resistance, uv radiation resistance, especially resistance to extreme pressure liquid agent lubriC.A.Ting oil, gear oil, motor oil, oil, petroleum hydraulic oil, etc., suitable for -30~150 degrees Celsius range of work.
Fluorine rubber
Aging resistance, heat resistance, oil resistance, almost applicable to all lubriC.A.Ting oil, fuel oil, gasoline, in the oil containing extreme pressure additives is not easy to harden, but cold resistance, high temperature wear resistance is poor, permanent compression deformation is large, suitable for the temperature of -20~250 degrees Celsius.
Silicone rubber
With outstanding high and low temperature resistance, can be used at 150 degrees Celsius for a long time without performance change; It can be continuously used for 10000h under 200 conditions, and it can maintain its unique advantages of elasticity, ozone resistance and weather resistance in the working temperature range of -70~260.
Polytetrafluoroethylene
It has outstanding chemical stability, thermal stability, antifriction and self lubricity, and its cracking temperature is above 400. Therefore, it can work in the temperature range of -200~300 degrees Celsius. In addition to free fluorine and alkali metals, it has excellent corrosion resistance to chemicals, solvents, hydroxyl compounds and acids [2].
Nitrile rubber compared with fluorine rubber material is to use a wide range of oil seal, the cost is low, but the heat resistance and sealing has improved significantly, but the cost is higher, and still have some adverse commonness of ordinary rubber materials, such as poor wear resistance and short service life, particularly sensitive response to the eccentric shaft, such as leakage phenomenon is relatively common. PTFE oil seal is a product with high technical content, which is the development direction of oil seal in the future [2].
When choosing the material for the oil seal, the compatibility of the material to the working medium, the adaptability to the working temperature range and the ability of the lip edge to follow the rotating axis at high speed must be considered. Generally, the temperature of the lip edge of the oil seal is 20~50℃ higher than the temperature of the working medium. Attention should be paid to the selection of the oil seal material. The working range of the oil seal is related to the material used in the oil seal: the material is nitrile rubber (NBR) -40~120℃, Alic rubber (ACM) -30~180℃, fluorine rubber (FPM) -25~300℃.

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