Fluorine rubber has unique properties, and the properties of vulcanized rubber are described as follows.
(1) Corrosion resistance:
Fluorine rubber has excellent corrosion resistance. Generally speaking, it is superior to other kinds of rubber in terms of the stability of organic liquid (fuel oil, solvent, hydraulic medium, etc.), concentrated acid (nitric acid, sulfuric acid, hydrochloric acid), high concentration of hydrogen peroxide and other strong oxidants.
(2) Swelling resistance:
Fluorine rubber has a high degree of chemical stability, is currently all elastomers in the medium resistance of the best one. Type 26 fluorine rubber resistant to petroleum based oil, double ester oil, silicone ether oil, silicone acid oil, resistance to inorganic acid, resistance to most organic and inorganic solvents, drugs, only resistance to low molecular ketone, ether, ester, resistance to amine, ammonia, hydrofluoric acid, chlorosulfonic acid, phosphoric acid hydraulic oil. The medium performance of type 23 is similar to that of type 26, and more unique. It has better resistance to strong oxidizing inorganic acids such as fuming nitric acid and concentrated sulfuric acid than type 26, and its volume expansion is only 13% ~ 15% after soaking in 98% HNO3 for 27 days at room temperature.
(3) Heat and high temperature resistance:
Fluorine rubber and silicone rubber can be comparable in aging resistance, better than other rubber. Type 26 fluorine rubber can work at 250 ℃ for a long time and 300 ℃ for a short time. Type 23 fluorine rubber still has high strength after aging at 200 ℃×1 000 h and can also withstand the effect of 250 ℃ short-term high temperature. The thermal decomposition temperature of ptfe rubber is above 400 ℃, and it can work for a long time at 230 ℃. The properties of fluorine rubber at different temperatures change more than that of silicone rubber and general butyl rubber. Its tensile strength and hardness both decrease obviously with the increase of temperature. The variation characteristics of tensile strength are as follows: below 150 ℃, it decreases rapidly with the increase of temperature, and between 150 ℃ and 260 ℃, it decreases slowly with the increase of temperature.