1. Oil, solvent and chemical resistance
Compared with methyl vinyl silicone rubber, fluorosilicone rubber has extremely excellent oil resistance, solvent resistance, and chemical resistance; even compared with fluororubber, its oil resistance and solvent resistance are also good. It shows excellent durability after immersion in the same medium, temperature and time. It can be said that fluorosilicone rubber is the only elastomer that can withstand non-polar media at -68°C ~ 232°C.
Fluorosilicone rubber also has relatively good resistance to methanol-containing gasoline. Even in a gasoline/methanol (85vol%/15vol%) mixed system, the hardness, tensile strength, and volume of the vulcanized rubber change very little. After 500 hours of use, the After the immersion test, there was almost no change in various physical properties.
2. Heat resistance
The high temperature decomposition of fluorosilicone rubber is the same as that of silicone rubber, namely: side chain oxidation, main chain breakage, side chain thermal decomposition and various composite reactions. Since the decomposition products can also cause the main chain to break, the heat resistance is usually worse than that of silicone rubber, and it has begun to oxidize and age at a temperature of 200°C. However, by adding a small amount of heat stabilizers such as iron, titanium, rare earth oxides, etc., it can be significantly improved, and it has sufficient heat resistance even at a high temperature of 250°C.
The effect of temperature on fluorosilicone rubber is greater than that of silicone rubber, but less than that of fluororubber. Foreign studies have also studied the service life of fluorosilicone rubber under the conditions of 150℃×2000h, 175℃×5000h, and 200℃×4000h. The results are second only to methyl vinyl silicone rubber.
3. Cold resistance
Fluorosilicone rubber, like ordinary silicone rubber, has good low-temperature properties. Since fluorosilicone rubber is a linear polymer composed of soft Si-O as the main chain, its low temperature characteristics are better than those of fluororubber with C-C as the main chain. Among them, fluorosilicone has better low-temperature characteristics, with a brittleness temperature as low as -89°C, while general fluororubber is about -30°C.
4. Electrical properties and radiation resistance
The electrical properties of fluorosilicone rubber are similar to ordinary silicone rubber, but what is particularly valuable is that it changes very little under harsh conditions such as high temperature, low temperature, moisture, oil, solvents, chemicals, and ozone.
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 is the same as ordinary silicone rubber. The mechanical strength of vulcanized rubber (especially tear strength) is relatively low. Therefore, improving and increasing the strength of fluorosilicone rubber is also an important research topic.
6. Other features
Fluorosilicone rubber has excellent weather aging resistance and still maintains good performance even after 5 years of exposure. Ozone is one of the most generated gases when elastomers age, but no cracks or cracks have been found in fluorosilicone rubber after dynamic or static tests.

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