The grade of silicone rubber is mainly divided based on its temperature resistance, hardness, wear resistance, and other physical and chemical properties. The following is a specific introduction to the grades of silicone rubber:
One. Temperature resistance level
1. General grade: Silicone rubber generally has a temperature resistance range of -60 ℃ to+200 ℃.
2. Medium level: Silicone rubber has a medium temperature resistance range of -60 ℃ to+250 ℃.
3. High level: Silicone rubber has advanced temperature resistance up to+300 ℃.
Two. Hardness grade
The hardness level of silicone rubber is usually represented by Shore A hardness, with a common hardness range from 0 ° A (very soft) to 100 ° A (superhard).
1. Very soft silicone rubber (0 ° A): with ultra-high elongation, but low tensile strength, commonly used in children's toys, etc.
2. Soft silicone rubber (5-10 ° A): moderate elongation and tensile strength, suitable for making gaskets, etc.
3. Medium hardness silicone rubber (20-30 ° A): more robust, maintaining a certain degree of elasticity and compressibility, commonly used in electronic product casings.
4. Slightly hard silicone rubber (40-50 ° A): moderate hardness, suitable for use in automotive seals, etc.
5. Hard silicone rubber (60-90 ° A): high hardness, wear resistance, and high temperature resistance, mainly used for making injection molds, etc.
6. Ultra hard silicone rubber (90-100 ° A): suitable for fields that require high temperature resistance, acid and alkali resistance, and wear resistance.
In addition, the grade of silicone rubber may also be affected by other factors such as wear resistance and flame retardancy. In practical applications, it is necessary to choose the appropriate grade of silicone rubber based on the specific usage environment and requirements.
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