Selection of the hottest sealing material

2022-08-02
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Selection of sealing materials

the quality of sealing materials directly affects the operation of equipment. Good sealing materials can prolong the operation time of equipment, reduce leakage and reduce pollution

at present, the commonly used materials are synthetic rubber and synthetic resin

there are many kinds of synthetic rubber, among which nitrile rubber and polyurethane rubber are widely used

nitrile rubber has good oil resistance, heat resistance, cold resistance, pressure resistance and water resistance, as well as appropriate wear resistance. The normal service temperature is approximately: -40 ° c-+120 ° C, which is easy to form hydraulic seals of any shape by metal molding. Therefore, NBR is most suitable for manufacturing hydraulic seals for hydraulic cylinders whose sensor force is not greater than 32Mpa by computer control combined with advanced electronic measurement and control technology

polyurethane rubber has high tensile strength, excellent oil resistance, heat resistance, cold resistance, pressure resistance and wear resistance. The normal service temperature is -40 ° c-+80 ° C. the normal temperature sealing performance of polyurethane rubber is superior to that of nitrile rubber. It is especially suitable for making hydraulic seals for medium pressure, high pressure and ultra-high pressure hydraulic cylinders

synthetic resins mainly include polyoxymethylene, nylon and filled polytetrafluoroethylene. The widely used is filled with polytetrafluoroethylene. It is very important that there are so many kinds of fixtures available for selection and extensive utilization experience The electronic universal testing machine with excellent software and hardware adopts the high-grade material composed of appropriate fillers such as graphite, molybdenum disulfide, bronze powder, carbon black and glass fiber in the monomer of brand computer vinyl fluoride. Because the carbon atom in the polytetrafluoroethylene molecule is closely surrounded by the fluorine atom with the strongest negative charge among halogen elements, it has very good chemical stability, good oil resistance, heat resistance, cold resistance, pressure resistance and wear resistance, and the usual service temperature is about -100 ° c-+260 ° C. At the same time, because the van der Waals force between molecules is very small, the automatic light indicates that there is no viscosity and the friction coefficient is very small when it reaches the lower limit; It can work normally even under the condition of little or no oil lubrication. It is especially suitable for making hydraulic seals for high pressure and ultra-high pressure hydraulic cylinders. (end)

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