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Description of the use of seal materials
Introduction to the use of seal materials
It has good oil resistance and is compatible with most mineral base oils and greases. However, it does not apply to materials with large elastic modulus and high strength. The rest of the performance is the same as the nitrile rubber. Phosphate series hydraulic oils and gear oils containing polar additives are not resistant to aromatic hydrocarbons and chlorinated hydrocarbons, ketones, amines, and anti-liquid HFD. Heat, acid and alkali resistant and other chemicals. Oil resistant (including phosphate ester series hydraulic oil), suitable for all lubricants, gasoline, hydraulic oil, synthetic oil, etc. Resistant to HFD, fuel, chain hydrocarbons, aromatic hydrocarbons and chlorinated hydrocarbons and most inorganic acid mixtures. However, it is not resistant to ketones, amines, anhydrous ammonia, low molecular organic acids such as formic acid and acetic acid.
Good chemical stability, good heat and cold resistance, and resistant to various media such as oil, water, gas and chemicals. High mechanical strength, high pressure resistance, good wear resistance, very low friction coefficient and good self-lubricating properties. Teflon has creeping and cold flow phenomena, and the deformation of time increases under the continuous action of a certain load (this phenomenon has a great relationship with temperature). Pure polytetrafluoroethylene can not be used as a hydraulic sealing material. Only filled PTFE can be used. Commonly used are bronze powder filling and glass fiber filling. These fillers reduce the thermal expansion coefficient, improve the heat transfer capacity, increase the wear resistance, and improve the resistance. Cold flow (creep) performance. PTFE is not elastic, so it is always used with rubber elastomers to provide the required pre-tension to achieve a perfect seal.
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