Properties and uses of fluorine rubber

Good stability
Fluoro rubbers [2] has a high chemical stability, is currently the best medium resistance in all elastomers. 26 fluoro rubber resistant to petroleum based oils, double silicate ester oil, ether oil, Silicon oil, mineral acid-resistant, resistant to most organic and inorganic solvents, chemicals, etc, not only resistant to low molecular weight of ketones, ethers, esters, impatient with amines, ammonia, phosphoric acid, hydrofluoric acid, and chlorosulfonic acid type of hydraulic oil. 23-dielectric properties of fluorine rubber with 26 is similar to and more unique features, its resistance to strong oxidation of inorganic acids such as nitric acid, fuming sulfuric acid better performance than type 26, immersion at room temperature 98% of HNO3 volume expansion for 27 days it is only 13%~15%.
High-temperature resistance
Fluorine rubber and the high temperature resistance of silicone rubber, can be said to be the current best of elastomers. 26-41 fluoride gel in 250 ℃ long-term use, 300 ℃ for short-term use; 246 fluoro rubber heat-resistant than 26-41 OK. At 300 ° c after x100 hours of aging by heat and air 26-41 and 300 ℃ x100 246-after hours hot air aging properties, the elongation at break can be maintained at around 100% and hardness 90~95du. 246-350 ℃ hot air aging after 16 hours to maintain good flexibility after 110 minutes at 400 ° c hot air aging to maintain good flexibility after 110 minutes at 400 ° c hot air aging, spray method of thermal cracking of carbon black, carbon black or carbon fiber rubber elongation increased by approximately 1/2~1/3, strength of around one-second, still maintaining good flexibility. 23-11 fpm at 200 ℃ long-term use, 250 deg c for short-term use.
Ageing resistance
FKM has excellent weather resistance, aging resistance, ozone resistance. It was reported that DuPont developed VitonA in the nature store ten years after performance remained satisfactory, ozone concentration is 0.01% in the air after 45 days no visible cracking. 23 of fluoro rubber resistant to aging, ozone-resistant properties are excellent.
Vacuum performance
Type 26 FKM has excellent vacuum performance. Basic formula of 246 fluoro rubber rubber vacuum outgassing rate is only 37x10-6 Torr l/s. Cm 2. 246 fluoro 10-9 Torr has been successfully used in vacuum conditions.
Mechanical properties
FKM has excellent physical and mechanical properties. 26 powerful fluoro complexes in 10~20MPa between the elongation at break in between 150~350% and tensile strength between 3~4KN/m. 23-fluoro power between 15.0~25MPa and elongation in 200%~600%, tensile strength between 2~7MPa. In General, the fluorine rubber compression at high temperatures, but if in the same condition, such as 150 degrees centigrade equal time under compression, butyl and neoprene are larger than 26-fluorine rubber, 26-fluorine at 200 ° c x24 hours under compressive deformation or compressive deformation of butyl rubber at 150 ° c x24 hours.
Electrical properties
23 electrical properties of fluoro rubber, low moisture absorption than other elastomer can be used as good electrical insulating materials. 26 rubber can be used in low frequency and low voltage.
Permeability of small
Fluorine rubber on the solubility of gases is relatively large, but the diffusion rate is relatively small, so the overall permeability of performance is also small. It was reported that 26-Viton for oxygen at 30 ℃, nitrogen, helium, carbon dioxide gas permeability, and butyl rubber, butyl rubber, neoprene, natural rubber is better than.
Low-temperature performance
Fluorine rubber low-temperature performance is not good, this is due to the chemical structure of the products, such as 23-11-Tg>0 degrees Celsius. Actual use of fluoro rubber properties is usually represented by brittle temperature and compression cold coefficient. Rubber compound formulations, as well as the shape of the product (such as thickness) are relatively greater impact on brittleness temperature, amount as filler in recipes to increase the brittleness temperature sensitive to bad, the thickness of the product increases, brittle mixture was sensitive to go bad.

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