There have been such cases in modern space flight. Sealing materials such as PTFE gaskets should generally have good physical and mechanical properties, high resilience, small compression set, reliable sealing, convenient processing and long service life. The aerospace industry also requires sealing materials such as Teflon gaskets to meet specific environmental requirements such as vacuum, radiation, pollution, non-toxicity, high and low temperature resistance, and resistance to aviation fuels and rocket propellants.
The sealing material such as PTFE gasket can be formulated into liquid or paste when used, coated between the contact surfaces of the two parts, and cured under certain conditions or sealed by dry putty; it can also be processed. Solid or hollow rings of various shapes are 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.
Classification of sealing materials such as PTFE gaskets:
The sealing material is divided into four categories: fluid sealing material, non-fluid sealing material, dynamic sealing and static sealing.
Shaped and amorphous materials that can withstand seam displacement for airtight, watertight purposes and embedded in the joints of the building.
Packing: Packing is a traditional sealing product with a long history of use, but with the advancement of science, the original materials are constantly innovated, new materials are continuously researched and developed, and today's packing is no longer in the same way as traditional packing. Language.
Mechanical seals, also known as end seals, are ideal for leak prevention on pumps, centrifuges, reactors, and compressors due to their low leakage, long life, and ease of installation and maintenance.
Soft filler: Soft filler, also called mud-like soft filler, is a new generation of sealing material, which can achieve complete leak-free effect. Moreover, the advantages of non-stop online maintenance, no wear on the shaft, and no restrictions on the size of the specifications are unmatched by other sealing materials.
Traditional hydraulic and pneumatic sealing products are molded, special seals need to be opened separately, the cost is high, the cycle is long, and the precision is not easy to control. The birth of turning seals solved the above problems. Othello's moldless turning system uses raw materials supplied by internationally renowned companies to provide users with high quality sealing products of any material, any cross section and any size, and real-time delivery. Products are widely used in mining brackets, engineering machinery and other hydraulic and pneumatic equipment with strict sealing effect.
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