Fluorosilicone rubber is a special synthetic rubber that combines the advantages of fluororubber and silicone rubber, thus having excellent high and low temperature performance. The following is a detailed analysis of the high and low temperature performance of fluorosilicone rubber:

High temperature performance:
    Fluorosilicone rubber exhibits excellent stability under high temperature conditions. Due to its molecular structure containing fluorine and silicon atoms, these atoms have strong bond energies, making fluorosilicone rubber less likely to decompose or degrade at high temperatures.
    In high-temperature applications, the tensile strength and tear strength of fluorosilicone rubber are generally superior to that of fluororubber. This means that under high-temperature conditions, fluorosilicone rubber can maintain better structural integrity and mechanical properties.
    In addition, fluorosilicone rubber also has good heat-resistant oxidation properties, which can be used at high temperatures for a long time without significant performance degradation.

Low temperature performance:
    Fluorosilicone rubber has a low glass transition temperature, which means that its molecular chain can still maintain good mobility at low temperatures, making it less prone to embrittlement or fracture.
    Therefore, the elasticity and flexibility of fluorosilicone rubber at low temperatures are usually better than that of fluororubber, which can maintain good performance over a wider temperature range.
    In extreme low temperature environments, fluorosilicone rubber can still maintain a certain degree of mechanical strength and elongation, which makes it unique in low temperature applications.

Weathering resistance:
    Fluorosilicone rubber not only performs well in high and low temperature environments, but also has good weather resistance. It can resist the erosion of environmental factors such as ultraviolet rays and ozone, maintaining stable performance over the long term.
    This makes fluorosilicone rubber highly reliable for applications in outdoor or harsh environments.

In summary, fluorosilicone rubber has excellent high- and low-temperature properties, especially in terms of tensile strength and tear strength in high-temperature applications. Therefore, fluorosilicone rubber has broad application prospects in high-temperature sealing, pipelines, gaskets, and other applications in the aerospace, automotive, chemical, and other fields. At the same time, its good low-temperature performance also makes fluorosilicone rubber uniquely advantageous for applications in low-temperature environments.