1. Oil resistance, solvent resistance, and chemical resistance
Compared with methyl vinyl silicone rubber, fluorosilicone rubber has excellent oil resistance, solvent resistance, and chemical resistance; Even compared to fluororubber, it has good oil and solvent resistance. After immersion in the same medium, temperature, and time, fluorosilicone rubber exhibits excellent durability. It can be said that fluorosilicone rubber is the only elastomer that can withstand non-polar media at -68 ℃ to 250 ℃. The resistance of fluorosilicone rubber to methanol containing gasoline is also relatively good. Even in gasoline/methanol mixed systems, the hardness, tensile strength, and volume change of its vulcanized rubber are very small. After a 500 hour long immersion test, all physical properties have hardly changed.
2. Heat resistance
The high-temperature decomposition of fluorosilicone rubber is similar to that of silicone rubber, which includes side chain oxidation, main chain breakage, side chain thermal decomposition, and various composite reactions. Due to the fact that decomposition products can also cause main chain breakage, the heat resistance is usually worse than that of silicone rubber, and oxidation aging has begun at a temperature of 200 ℃. But by adding a small amount of heat stabilizers such as iron, titanium, and rare earth oxides, it can be significantly improved, and even at high temperatures of 250 ℃, it has sufficient heat resistance. Temperature has a greater impact on fluorosilicone rubber than on silicone rubber.
3. Cold resistance
Fluorosilicone rubber, like ordinary silicone rubber, has good low-temperature performance. Due to the fact that fluorosilicone rubber is a linear polymer composed of soft Si-O as the main chain, its low-temperature properties are superior to those of fluorosilicone rubber with C-C as the main chain. Among them, fluorosilicone rubber has better low-temperature characteristics, with a brittleness temperature as low as -89 ℃, while general fluorosilicone rubber is about -30 ℃.
4. Electrical performance and radiation resistance
The electrical performance of fluorosilicone rubber is similar to that of ordinary silicone rubber, but its particularly valuable feature is that it undergoes minimal changes under harsh conditions such as high temperature, low temperature, humidity, oil, solvents, chemicals, ozone, etc. The radiation resistance of fluorosilicone rubber is not outstanding, but its radiation aging resistance is better than that of methyl vinyl silicone rubber.
5. Physical and mechanical properties
Fluorosilicone rubber, like ordinary silicone rubber, has lower mechanical strength (especially tear strength) of vulcanized rubber. Therefore, improving and enhancing the strength of fluorosilicone rubber is also an important research topic.
6. Other characteristics
Fluorosilicone rubber has excellent weather aging resistance and maintains good performance even after 5 years of exposure. Ozone is one of the gases generated most during the aging of elastomers, but no cracking or cracking was found in fluorosilicone rubber after dynamic or static testing. In addition, the antifungal, physiological inertness, and anticoagulant properties of fluorosilicone rubber are also very good.

Regarding silicone rubber, please check the details:
https://www.rtvsilicone.net/product-fluoro-silicone-gum-.html