Fluororubber has high chemical stability and is the best medium resistance among all elastomers. Type 26 fluororubber is resistant to petroleum based oil, double ester oil, silicone ether oil and silicic acid oil, inorganic acid, most organic and inorganic solvents and drugs, only low molecular ketones, ethers and esters, and amine, ammonia, hydrofluoric acid, chlorosulfonic acid and phosphoric acid hydraulic oil. The dielectric properties of type 23 fluoroadhesive are similar to those of type 26, and 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. After immersion in 98% HNO3 at room temperature for 27 days, its volume expansion is only 13% ~ 15%.

Fluororubber has the same high temperature resistance as silicone rubber, which can be said to be the best elastomer at present. 26-41 fluorine glue can be used for a long time at 250 ℃ and for a short time at 300 ℃; 246 fluorine glue has better heat resistance than 26-41. At 300 ℃ × Physical properties of 26-41 after 100 hours air thermal aging and 300 ℃ × After 100 hours of hot air aging, the performance of type 246 is equivalent, its elongation at break can be maintained at about 100%, and its hardness is 90 ~ 95 degrees. The 246 type maintained good elasticity after 350 hours of hot air aging for 16 hours. After 400 minutes of hot air aging for 110 minutes, it maintained good elasticity. After 400 minutes of hot air aging for 110 minutes, the elongation of the compound containing spray carbon black, hot cracking carbon black or carbon fiber increased by about 1/2~1/3, and the strength decreased by 1/2. 23-11 fluorine glue can be used for a long time at 200 ℃ and for a short time at 250 ℃.

Fluororubber has excellent weather aging resistance and ozone resistance. It is reported that the performance of vitona developed by DuPont is still satisfactory after ten years of natural storage, and there is no obvious cracking after 45 days in the air with ozone concentration of 0.01%. The weather aging resistance and ozone resistance of type 23 fluororubber are also excellent.

Type 26 fluororubber has excellent vacuum performance. The vacuum outgassing rate of vulcanizate with 246 fluororubber basic formula is only 37 × 10-6 Torr L / s. cm2. 246 fluororubber has been successfully applied under vacuum conditions of 10-9 Torr.

Fluororubber has excellent physical and mechanical properties. The general matching strength of type 26 fluororubber is 10 ~ 20MPa, the elongation at break is 150 ~ 350%, and the tear strength is 3 ~ 4kn / m. The strength of type 23 fluororubber is 15.0 ~ 25MPa, the elongation is 200% ~ 600%, and the tear strength is 2 ~ 7MPa. Generally, the compression set of fluororubber at high temperature is large, but if compared under the same conditions, for example, from the compression set at 150 ℃ for the same time, both butadiene and chloroprene rubber are larger than type 26 fluororubber, and type 26 fluororubber is at 200 ℃ × The compression deformation at 24 hours is equivalent to that of butadiene rubber at 150 ℃ × 24-hour compression deformation.

Type 23 fluororubber has better electrical properties and lower moisture absorption than other elastomers. It can be used as a better electrical insulation material. Type 26 rubber can be used under low frequency and low pressure.

The solubility of fluororubber to gas is relatively large, but the diffusion rate is relatively small, so the overall air permeability is also small. It is reported that the permeability of type 26 fluororubber to oxygen, nitrogen, helium and carbon dioxide at 30 ℃ is equivalent to that of butyl rubber and butadiene rubber, and better than neoprene and natural rubber.

The low temperature performance of fluororubber is poor, which is due to its own chemical structure, such as TG > 0 ℃ of 23-11 type. The low temperature performance of fluororubber used in practice is usually expressed by brittleness temperature and compression cold resistance coefficient. The formula of the rubber compound and the shape (such as thickness) of the product have a great impact on the brittleness temperature. If the amount of filler in the formula increases, the brittleness temperature sensitively deteriorates, the thickness of the product increases, and the brittleness mixing degree also sensitively deteriorates.

The radiation resistance of fluororubber is one of the worse elastomers. Type 26 rubber shows crosslinking effect after radiation, while type 23 fluororubber shows cracking effect. The radiation of 246 fluororubber in air at room temperature is 5 × At a dose of 107 Lun, the performance changed sharply at 1 × Under the condition of 107 Lun, the hardness increases by 1 ~ 3 degrees, the strength decreases by less than 20%, and the elongation decreases by 30% ~ 50%. Therefore, it is generally considered that 246 fluororubber can withstand 1 × 107 Lun, limit 5 × 107 Lun.

Because fluororubber has the characteristics of high temperature resistance, oil resistance, high vacuum resistance, acid and alkali resistance and resistance to a variety of chemicals, it has been applied to advanced technologies such as modern aviation, missiles, rockets, aerospace, ships and atomic energy, as well as industrial fields such as automobile, shipbuilding, chemistry, petroleum, telecommunications, instruments and machinery.