The cold resistance of fluorosilicone (also known as fluorosilicone rubber) is one of its remarkable characteristics. The following is a detailed analysis of the cold resistance of fluorosilicone:

1. Overview of cold resistance
The main chain of fluorosilicone contains a flexible Si-O structure, which enables fluorosilicone to maintain good flexibility and elasticity at low temperatures. Therefore, fluorosilicone has excellent cold resistance and can maintain a stable working state in extremely cold environments.

2. Cold resistance performance
The brittle temperature of fluorosilicone is low, usually reaching -70℃ to -89℃, which is much better than ordinary fluororubber (about -30℃). At such a low temperature, fluorosilicone can still maintain good flexibility and sealing performance, and will not harden or crack.

3. Factors affecting cold resistance
Molecular structure: The molecular structure of fluorosilicone contains silicon-oxygen bonds and fluorine atoms. This structure enables fluorosilicone to maintain the flexibility of the molecular chain at low temperatures, thus having excellent cold resistance.
Crosslinking density: The crosslinking density also has a certain influence on the cold resistance of fluorosilicone. Appropriate cross-linking density can improve the strength and elasticity of fluorosilicone while maintaining its flexibility at low temperatures.
Additives: Certain additives, such as plasticizers, can further improve the cold resistance of fluorosilicone. Plasticizers can reduce the interaction between the molecular chains of fluorosilicone, making it easier to move at low temperatures, thereby improving flexibility.

4. Cold resistance test and verification
In order to verify the cold resistance of fluorosilicone, experiments such as low-temperature tensile strength test and low-temperature brittleness test are usually required. These tests can evaluate the changes in mechanical properties, flexibility and brittleness of fluorosilicone at low temperatures.

5. Application fields
Due to its excellent cold resistance, fluorosilicone is widely used in occasions that require low temperature resistance. For example:
Aerospace: used to manufacture seals and O-rings on aircraft and rockets to ensure sealing performance in extreme cold environments.
Automotive industry: used to manufacture hoses and seals in automotive cooling systems, which can withstand pressure and vibration in low-temperature environments.
Outdoor equipment: used to manufacture seals and protective covers for outdoor electronic equipment, lighting equipment, etc., to ensure normal operation and protection performance in low-temperature environments.

In summary, fluorosilicone has excellent cold resistance and can maintain a stable working state in extremely cold environments. This feature makes fluorosilicone have broad application prospects in aerospace, automotive industry, outdoor equipment and other fields.