The main performance
1.Good chemical stability
Fluorine rubber with high chemical stability, which is one of the best elastomer medium resistance of all kinds.26 type fluorine rubber oil resistant base oil, double ester oils ethers, silicon oil, oil, silicate inorganic acid resistance, resistance to most organic and inorganic solvents, drugs, etc, is not only resistant to low molecular, ether, ester, ketone amine and ammonia, hydrofluoric acid, chlorosulfonic acid, phosphoric acid type of hydraulic oil.23 type fluorine rubber dielectric properties similar to 26 type, and even more unique, its strong oxidation resistance of the inorganic acid such as fuming nitric acid, sulfuric acid performance is better than 26 type, 98% HNO3 at room temperature the macerate in 27 days its volume expansion is only 13% ~ 15%.
2.Excellent resistance to high temperature
High temperature resistant properties of fluorine rubber and silicone rubber, can be said to be the best in the elastomer.26-41 fluorine rubber can be use for a long time under 250 ℃, 300 ℃ under short-term use;246 fluorine rubber heat-resistant than 26-41.At 300 ℃, 100 hours after air thermal aging properties of 26-41 and 300 ℃ after hot air ageing type 246 x 100 hours, the performance of its elongation at failure can remain at around 100%, the hardness of 90 ~ 95 degrees.Type 246 in the 350 ℃ hot air aging after 16 hours to maintain good elasticity, after 400 ℃ hot air aging 110 minutes to maintain good elasticity, after 400 ℃ hot air aging 110 minutes, containing carbon black, cracking spray method of carbon black or carbon fiber sizing elongation increases about 1/2 ~ 1/3, intensity fell by about half, still keep good elasticity.23-11 type fluorine rubber can be use for a long time under 200 ℃, 250 ℃ under short-term use.
3.Aging resistant performance is good
Fluorine rubber has excellent weather aging resistance, ozone resistance.According to reports, DuPont developed VitonA in natural storage performance is still unsatisfactory, after ten years of 45 days in ozone concentration is 0.01% in air, there is no obvious crack.23 type fluorine rubber weather aging resistance, ozone resistance is excellent.
4.Vacuum performance is admirable
26 type fluorine rubber has excellent vacuum performance.246 basic formula of fluorine rubber vulcanizates vacuum degassing rate is only 37 x 10-6 torr liters per second. 2 cm.246 type fluorine rubber has been successfully used in the vacuum conditions of 10 to 9 torr.
5.Excellent mechanical performance
Fluorine rubber has excellent physical and mechanical properties.26 type fluorine rubber between general together with the powerful in 10 to 20 mpa, the elongation at failure between 150 ~ 350%, the tensile strength between 3 ~ 4 kn/m.23 type fluorine rubber strength between 15.0 ~ 25 mpa, elongation was 200% ~ 600%, the tear strength between 2 ~ 7 mpa.Generally, fluorine rubber compression permanent deformation at high temperature is big, but if compare with the same conditions, such as from 150 ℃ under the same time the compression set, neoprene and butyl is bigger than 26 type fluorine rubber, 26 type fluorine rubber compression deformation under 200 ℃ x 24 hours of butyl rubber compression deformation in 150 ℃ by 24 hours.
6.Performance is better
23 type electric properties of fluorine rubber, high hygroscopicity, lower than the other elastomer can be used as good electrical insulating materials.26 type rubber can be used in low frequency under low pressure.
7.Permeability is small
Fluorine rubber on the solubility of a gas is large, but the diffusion velocity is smaller, so the overall performance of permeability is also small.According to reports, 26 type fluorine rubber under 30 ℃ for oxygen, nitrogen, helium and carbon dioxide gas permeability and butyl rubber, butyl rubber, neoprene, natural rubber is better.
8.Low temperature performance is not good
Low temperature properties of fluorine rubber is not good, this is due to its chemical structure, such as 23-11 of Tg > 0 ℃.Actual use of fluorine rubber performance in low temperature often said with a brittle temperature and the compression coefficient of hardy.Sizing formula and the shape of the products, such as thickness of brittleness temperature influence is big, such as formulation of filler increase brittleness temperature sensitive to deteriorate, the thickness of the products increases, the brittle confusion degree also sensitive to deteriorate.
9.Radiation resistance is poor
In radiation resistant properties of fluorine rubber elastomer is a kind of poor, after radiation function of 26 type rubber crosslinking effect, 23 type fluorine rubber is characterized by cracking effect.246 type fluorine rubber radiation in air at room temperature in the higher doses of 5 x 107 severe changes of performance under the condition of 1 x 107 shimron hardness increase 1 ~ 3 degrees, the strength drops below 20%, the elongation decreased 30% ~ 50%, so it is generally believed 246 type fluorine rubber can be resistant to 1 x 107 shimron, limit of 5 x 107 accessions.
10.The key application
Because the fluorine rubber has high vacuum and high temperature resistant, oil resistant, resistant to acid and alkali resistance, the characteristics of a variety of chemicals, has been applied in modern aircraft, missile, rocket, space travel, ships, nuclear power and other cutting-edge technology and automobile, shipbuilding, chemical, petroleum, telecommunication, apparatus, machinery and other industrial fields.