The temperature resistance range of a non-metallic expansion joint skin can vary depending on the specific material and design used. Here are some common non-metallic skin materials and their temperature resistance characteristics:
Silicone cloth skin：
Usually, the temperature resistance range is below 300℃, but after special treatment, the temperature resistance performance can be improved to a higher level. It has been reported that the non-metallic expansion joint band of silicone skin cloth can withstand temperatures up to 1000℃, but this usually requires special material formulation and manufacturing process.
Fluorine rubber cloth skin：
Fluororubber has good high temperature resistance, usually in the temperature range of 200°C to 250°C, but it has also been reported that specially treated flouorubber sheets can be used in higher temperature conditions.
Polytetrafluoroethylene film (PTFE)：
PTFE has excellent high temperature resistance, the temperature can reach 260℃ for continuous use, and the temperature can exceed 300℃ for short time use.
Alkali-free glass fiber cloth：
Alkali-free glass fiber cloth has good temperature resistance, which can reach a temperature above 500℃, but pure glass fiber cloth itself does not have sealing property, so it is usually used in combination with other materials.
Ceramic and aluminum silicate fibers：
These materials have very high temperature resistance properties and are commonly used in high temperature insulation layers, which can withstand high temperatures in excess of 1000°C.
In practical applications, the temperature resistance range of non-metallic expansion joint skin is usually about 500℃, but for higher temperature working conditions, the temperature resistance can be improved by adding insulation layer or using more layers of high temperature resistant materials. For example, adding insulating cotton not only improves temperature resistance, but also improves airtightness.
It is worth noting that the actual temperature resistance of the non-metallic expansion joint skin is also affected by a variety of factors, including but not limited to material aging, continuous working time, temperature fluctuations, media type, and pressure conditions, among others. Therefore, when selecting a non-metallic expansion joint, the temperature resistance and overall performance of the material should be carefully evaluated according to the specific working conditions and application requirements. Manufacturers often provide detailed material performance data and usage guidelines to help users make the right choice.