Good chemical stability
Fluorine rubber has a high degree of chemical stability and is the best medium resistance of all elastomers at present. Type 26 fluororubber is resistant to petroleum-based oils, diester oils, silyl ether oils, silicone oils, inorganic acids, most organic and inorganic solvents, pharmaceuticals, etc., only not resistant to low molecular ketones, ethers, esters, not resistant to amines, ammonia, hydrofluoric acid, chlorosulfonic acid, phosphoric acid hydraulic oil. The medium properties of type 23 fluorine adhesive are similar to those of type 26, and are more unique. Its resistance to strong oxidizing inorganic acids such as fuming nitric acid and concentrated sulfuric acid is better than that of type 26, and its volume expansion is only 13% to 15% after 27 days of immersion in 98% HNO3 at room temperature.
Excellent high temperature resistance
The high temperature resistance of fluorine rubber is the same as that of silicone rubber, and it can be said that it is the best elastomer at present. 26-41 Fluorine glue can be used for a long time at 250 ° C and for a short time at 300 ° C; 246 fluorogel is better at heat resistance than 26-41. The physical properties of 26-41 after 300℃×100 hours of air thermal aging are equivalent to the performance of 246 type after 300℃×100 hours of hot air aging, and the elongation at break can be maintained at about 100%, and the hardness is 90~95 degrees. Type 246 maintains good elasticity after 16 hours of aging in hot air at 350℃, and good elasticity after 110 minutes of aging in hot air at 400℃. After 110 minutes of aging in hot air at 400℃, the elongation of the rubber material containing spray carbon black, hot cracking carbon black or carbon fiber increases by about 1/2 to 1/3, and the strength decreases by about 1/2. Still maintains good elasticity. Type 23-11 fluorine adhesive can be used for a long time at 200 ° C and for a short time at 250 ° C.
Good aging resistance
Fluorine rubber has excellent weather aging resistance and ozone resistance. VitonA, developed by DuPont, has been reported to perform satisfactorily after ten years of natural storage, with no significant cracking after 45 days in air with an ozone concentration of 0.01%. Type 23 fluororubber has excellent weather aging resistance and ozone resistance.
Excellent vacuum performance
Type 26 fluororubbers have excellent vacuum properties. The vacuum discharge rate of vulcanizate of 246 fluororubber basic formula is only 37×10-6 torR/s. Centimeter 2. Type 246 fluororubbers have been successfully applied in vacuum conditions of 10-9 torR.
Excellent mechanical properties
Fluorine rubber has excellent physical and mechanical properties. The strength of type 26 fluororubbers is generally between 10~20MPa, the elongation at break is between 150~350%, and the tearing strength is between 3~4KN/m. The strength of type 23 fluoroprene is between 15.0 and 25MPa, the elongation is between 200% and 600%, and the tearing strength is between 2 and 7MPa. Generally, the compression permanent deformation of fluoroprene rubber at high temperature is large, but if compared with the same conditions, such as the compression permanent deformation of the same time at 150 ° C, butyl and neoprene rubber are larger than type 26 fluoroprene rubber, and the compression deformation of type 26 fluoroprene rubber at 200 ° C ×24 hours is equivalent to the compression deformation of burene rubber at 150 ° C ×24 hours.
Good electrical performance
Type 23 fluorine rubber has better electrical properties and lower hygroscopic properties than other elastomers, and can be used as a better electrical insulation material. Type 26 rubber can be used at low frequency and low pressure.
Low air permeability
The solubility of fluorine rubber to gas is relatively large, but the diffusion rate is relatively small, so the overall permeability is also small. It is reported that the permeability of type 26 fluororubber to oxygen, nitrogen, helium and carbon dioxide gases at 30 ° C is equivalent to that of butyl rubber and butadiene rubber, which is better than neoprene and natural rubber.