Use of sealing material
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 installed between the contact faces of the two parts to seal. The former means that the sealing material is only used for the static sealing part where the contact faces of the two parts have no relative movement; the latter is said that the sealing part can be used for both the static sealing part and the two parts. The contact surface has a relatively moving dynamic seal.
The sealing materials used in the aerospace industry mainly include: polysulfide rubber, silicone rubber and polyurethane sealant. Polysulfide rubber sealant has excellent resistance to aviation fuel, and is mainly used for sealing silicone rubber of the wing and the whole fuselage of the fuselage. 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 the connection of liquid hydrogen and liquid oxygen of rocket propellant. Encapsulants are also used for the cockpit, window door, instrument compartment, shell chamber, ejector, electrical plug, electronic components and electromagnet potting.
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 board), but the most used is rubber-like elasticity. Body material.