The sealing material can be formulated into a liquid or a paste during use, coated between the contact faces of the two parts, cured under certain conditions or sealed by a dry putty; or can be processed into solids of various shapes or The hollow ring is mounted to seal between the contact faces of the two components. The former means that the sealing material is only used for the static sealing part where the contact surface of the two parts has no relative movement; the latter is said that the sealing part can be used for both the static sealing part and the dynamic sealing part of the contact surface of the two parts with relative movement.
The sealing materials used in the aerospace industry mainly include: polysulfide rubber, silicone rubber and polyurethane sealants. Polysulfide rubber sealant has excellent aviation fuel resistance and is mainly used for sealing the entire fuel tank of the wing and the fuselage. Silicone rubber sealant can withstand high temperature and low temperature, radiation resistance, vacuum resistance, pollution-free, non-toxic, mainly used for sealing of various sealed compartments. Polyurethane sealant has good ultra-low temperature performance, and is mainly used for joints of liquid propellant liquid hydrogen and liquid oxygen. Encapsulants are also used for the filling of aircraft cockpits, window doors, instrument compartments, shells, ejector, electrical plugs, electronic components and electromagnets.
Sealing materials are metal materials (aluminum, lead, indium, stainless steel, etc.), non-metallic materials (rubber, plastic, ceramic, graphite, etc.) and composite materials (such as rubber-asbestos), but the most used is rubber-like elasticity. Body material.
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