What sealing materials can be used for aviation seals?

Sealing technology is common in every corner, affecting the performance of each system in the field of construction machinery, and the aviation field is not included. So aviation machinery to use seals? What kind of material are the seals used in aviation? The design seal specifications and models must conform to the applied sealing system equipment, and the sealing technical requirements must be strictly implemented. If there is a little sealing problem in the aviation zone, it will cause difficult disaster consequences. So the question can be avoided, why can't we spend more time to detect and analyze, reduce the incidence of harm, zero harm.

Seal design must first choose the appropriate sealing material, and then consider whether the chemical compatibility of the material used and the sealing medium is consistent, suitable for its environmental temperature requirements, as well as the internal movement speed of the machine, but also consider the aging speed of the seal in the process of application. However, aircraft engineering designers face harsh environments, including chemical environments and temperature changes, so a large number of aviation-grade elastic materials are used in aviation seals. During the sealing parts through manual welding and other manufacturing processes, some directly inside the metal parts, and the sealing materials used in the aviation seals are what?

Fluororubbers (FKM) are suitable for sealing mineral based oils used at high temperatures. Different structures and fluorine content fluorine rubber can show different chemical resistance and cold flexural properties. Fluorine rubber is famous for its flame retardancy, low permeability and excellent anti-ozone, anti-erosion and anti-aging ability, and can work at 230℃ for a short time.

Nitrile butadiene rubber (NBR) is sealed with mineral based grease. The characteristics of nitrile rubber mainly depend on its content, and this kind of material has good mechanical properties when working in the temperature range of -30 ~ 100 ° C. It can work at 120 ° C for a short time and can be specially designed at -60 ° C.

Hydrogenated nitrile butadiene rubber (HNBR) is obtained by selective hydrogenation of nitrile butadiene rubber materials. Hydrogenated nitrile rubber has good wear resistance, is often used in high temperature environment sealing, has good mechanical properties. Hydrogenated nitrile rubber can work at 160℃ for a short time.

Ethylene propylene diene (EPDM) rubber is often used in brake fluid, ethylene glycol and hot water seals. Epdm rubber has good high temperature resistance, ozone resistance and aging resistance. In addition, it has high elasticity, good low temperature performance and insulation. Three can work for a short time at 175 °C.

Silicone rubber is often used for gaskets, molded seals, airframes, aerodynamic and engine seals. The material has good thermal resistance, cold flexural and dielectric properties, and its oxygen resistance and ozone resistance are particularly strong. Depending on the material, it can work at 230℃ for a short time.

Fluorosilicone rubber (FVMQ) is often used in military fuel systems. Fluorine silicone rubber material has good thermal resistance, cold flexure and dielectric properties, and its oxygen resistance and ozone resistance are particularly strong. It can work at 230℃ for a short time.

Perfluorinated rubber (FFKM) is mostly used in the sealing of aircraft engines, applied in harsh high temperature environments, high temperature media are stable and have very low expansion. Depending on the material, the operating temperature range is -25 ~ 240 ° C, and special types can work at +325 °C.