The raw materials in the seal industry refer to materials that can withstand joint displacement to achieve airtight and watertight purposes and are embedded in building joints, referred to as sealing materials. Seal materials include metal materials (aluminum, lead, indium, stainless steel, etc.), non-metallic materials (rubber, plastic, ceramics, graphite, etc.) and composite materials (such as rubber asbestos boards), but the most commonly used are rubber elastomers Material.
Sealing raw materials are divided into two categories: fluid sealing raw materials and non-fluid sealing raw materials based on their forms.
3. Performance of sealing raw materials Sealing raw materials should generally have good physical and mechanical properties, high resilience, small compression permanent deformation, reliable sealing, easy processing and long service life. Silicone rubber
The rubber sealant is mild and low-temperature resistant, radiation-resistant, vacuum-resistant, pollution-free, and non-toxic. The polysulfide rubber sealant has excellent aviation fuel resistance, as well as high temperature resistance, high pressure resistance, flame resistance, and pressure resistance. They are all the leading sealing material directions in the sealing industry. The quality of sealing materials directly affects the production efficiency of mechanical equipment and has a great impact on the use efficiency of the equipment.
The sealing raw material can be formulated into liquid or sound form during use, applied between the contact surfaces of the two parts, and solidifies under certain conditions or becomes non-drying putty to play a sealing role. It can also be processed into various shapes of solid or The hollow ring is installed between the contact surfaces of the two components to seal. The former says that the sealing material is only used for static sealing parts where the contact surfaces of the two parts have no relative movement; the latter says that the seals can be used for both static sealing parts and dynamic sealing parts where the contact surfaces of the two parts have relative movement. Sealing raw materials include metal materials (aluminum, lead, indium stainless steel, etc.), non-metal materials (rubber, plastic, ceramics, graphite, etc.) and composite materials (such as citron gum asbestos board), but the most commonly used ones are rubber-based elastic materials. body material.
1. Molding Most rubber seals use this molding method, such as various extrusion seals, rotating uranium lip seals, reciprocating lip seals, composite seals, film seals, bellows seals, etc.
2. Processing and forming such as rectangular seal, piston ring seal, combined seal or sliding ring seal), etc.
3. Plate or strip type materials such as rubber, fiber reinforced rubber, bonded asbestos fiber, aromatic polyamide fiber, etc. Plate or strip type materials are mostly used for sealing pads or fillers, and rubber is used as a raw material for asbestos and its substitutes. Adhesives, in which aramid fiber and processed rubber rings are sometimes used for reciprocating seals in aerospace equipment.
