Fluoroelastomer seals, when used for engine sealing, can work for a long time at 200℃~250℃, and work for a short time at 300℃, and its working life can be the same as the engine rework life, which is 1000~5000 flight hours (5~10 years); when used in the chemical industry, it can seal the inorganic acid (e.g., 67% of sulfuric acid at 140℃, concentrated hydrochloric acid at 70℃, and 30% of nitric acid) , organic solvents (such as chlorinated hydrocarbons, benzene, highly aromatic gasoline) and other organics (such as butadiene, styrene, propylene, phenol, fatty acids at 275 ℃, etc.); used in deep-well oil extraction, it can withstand the harsh working conditions of 149 ℃ and 420 atmospheres; used in the superheated steam seals, it can be used in the steam medium at 160 ~ 170 ℃ for a long time. In the production of monocrystalline silicon, commonly used fluoroelastomer seals to seal the high temperature (300 ℃) under the special media - trichlorohydrosilicon, silicon tetrachloride, gallium arsenide, phosphorus trichloride, trichloroethylene, and hydrochloric acid 120 ℃.
In high vacuum applications, when the flight altitude of 200~300Km, the air pressure is 133×10-6 Pa (10-6mmHg), chloroprene rubber, butyl rubber, butyl rubber can be applied; when the flight altitude of more than 643Km, the air pressure will be reduced to 133×10-7Pa (10-7mmHg) the following, only fluoroelastomers can be applied in this high vacuum. Generally in the high vacuum or ultra-high vacuum device system before use, need to go through a high-temperature baking treatment, 26-type, 246-type fluoroelastomer can withstand high-temperature aging of 200 ℃ ~ 250 ℃, so it becomes the most important rubber material in the high-vacuum equipment and cosmic vehicles.
Hose made of fluoroelastomer is suitable for high temperature, oil and special media occasions, such as aircraft fuel oil, hydraulic oil, synthetic double ester oil, high temperature hot air, hot inorganic and other special media (such as chlorinated hydrocarbons and other chlorides) of the transport, guidance and so on. Made of fluoroelastomer wire and cable flexing good, and good insulation. The glass fiber tape made of fluoroelastomer can resist high temperature of 300℃ and chemical corrosion. Aramid cloth coated with fluoroelastomer, can be made in petrochemical plants, high temperature, acid and alkali class tanks between the connection expansion tube (both ends can be connected with a metal flange), can withstand high pressure, high temperature and medium corrosion, and the deformation of the two tanks expansion and contraction of the buffer shock-absorbing connection role. Nylon cloth coated with fluorine rubber made of tape sealing bag, as a refinery within the floating roof storage tanks with soft seals, play a role in sealing, reduce the volatilization of the oil surface loss.
Type 23, tetrapropyl fluorine rubber is mainly used as acid-resistant, corrosive sealing occasions of special chemicals. Hydroxy nitrosofluoroelastomer is mainly used as protective products and sealing products, in the form of solution as a non-combustible coating, applied to fire-resistant electronic components and parts working in pure oxygen. Its solution and liquid rubber can be sprayed, casting and other methods to manufacture many products, such as cosmic clothing, gloves, pipe bands, balls and so on. Can also be used as glass, metal, "Sex body, fabric adhesive, the manufacture of sponges and contact with rocket propellant (N2O4) gaskets, "O" ring, capsule all kinds of seals and so on.
The seals made of G-type fluoroelastomer series have the performance of high temperature steam resistance, methanol gasoline or high aromatic hydrocarbon gasoline resistance which cannot be achieved by using VitonA, B, E and other fluoroelastomers; GLT-type fluoroelastomers, phosphorus chlorinated rubbers, perfluoroether rubbers, etc., have a wider range of operating temperature, low-temperature softness, elasticity sealing, and so on. Perfluoroether rubber also has outstanding corrosion resistance to media, which is widely used in the cutting-edge technology of military industry.
