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Use Of Sealing Materials

When used, the sealing material can be formulated into a liquid or pasty form, coating in the two parts of the contact surface, in a certain condition, the curing or drying of the putty to play a role in sealing, can also be processed into various shapes of solid or hollow ring installed in the two parts of the interface between the sealing effect. The former said that the sealing material is only used for the static sealing parts of the two parts contact surface without relative motion; the latter said that the seals can be used both for the static sealing parts and for the moving seal parts of the contact surfaces of the two parts. The sealing materials used in aerospace industry are mainly: polysulfide rubber, silicone rubber and polyurethane sealant. Polysulfide rubber sealant has excellent resistance to aviation fuel performance, mainly used for wing and fuselage integral fuel tank seals. Silicone sealant is capable of high-temperature and low-temperature, radiation resistance, vacuum, non-polluting, non-toxic, mainly used in all kinds of sealed cabin seals. The low temperature performance of polyurethane sealant is good, it is mainly used for the connection seam of liquid hydrogen and liquid oxygen of rocket propellant. The aircraft's cockpit, windows, instrumentation cabin, artillery shells, ejector, electrical plugs, electronic components and electromagnetic iron potting also use sealants.

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