Most rubber seals use this type of extrusion method, such as various extrusion seals, rotary shaft lip seals, reciprocating lip seals, composite seals, film seals, bellows seals, and the like.
2. Processing and forming
Such as rectangular seals, piston ring seals, coaxial seals (or slip ring combination seals).
3. Board or strip type
Such as rubber, fiber reinforced rubber, bonded asbestos fiber, aramid fiber, etc., most of the plate or strip material is used for sealing gasket or filler, rubber as binder for asbestos and its substitute, aramid Fiber and machined rubber rings are sometimes used for reciprocating dynamic sealing of aerospace equipment.