In the ultra-vacuum environment, the sealing ring material needs to have extremely high air tightness, vacuum resistance and high temperature resistance to ensure the sealing performance and long-term stability of the system. The following are several commonly used ultra-vacuum sealing materials and their characteristics:
1. Fluorine rubber (FKM)
peculiarity
Chemical resistance: Excellent chemical corrosion resistance, can resist the erosion of most chemicals.
High temperature resistance: It can be used for a long time in an environment up to 200°C.
Oil resistance: Excellent oil and fuel resistance.
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Suitable for vacuum systems requiring high chemical and oil resistance.
It is commonly used in aerospace, semiconductor manufacturing and the nuclear industry.
2. Perfluoroether rubber (FFKM)
peculiarity
Chemical resistance: It has excellent chemical corrosion resistance and can resist almost all chemicals.
High temperature resistance: It can be used for a long time in an environment up to 327°C.
Vacuum resistance: It can maintain good sealing performance in extreme vacuum environment.
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Suitable for vacuum systems in extreme chemical corrosion and high temperature environments.
It is commonly used in semiconductor manufacturing, chemical industry and aerospace.
3. Silicone Rubber (VMQ)
peculiarity
High temperature resistance: It can be used for a long time in an environment up to 200°C.
Low temperature resistance: has good low temperature resistance, the lowest up to -60°C.
Biocompatibility: Excellent biocompatibility, non-toxic and tasteless.
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Suitable for vacuum systems requiring high temperature resistance and biocompatibility.
It is commonly used in medical devices, food processing and semiconductor manufacturing.
4. Polytetrafluoroethylene (PTFE)
peculiarity
Chemical resistance: has excellent chemical corrosion resistance, almost free from any chemical attack.
High temperature resistance: It can be used for a long time in an environment up to 260°C.
Low coefficient of friction: Has an extremely low coefficient of friction for applications requiring low friction seals.
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Suitable for vacuum systems requiring extremely high chemical resistance and low coefficient of friction.
It is commonly used in chemical, semiconductor manufacturing and aerospace fields.
5. Metal sealing ring
peculiarity
Air tightness: The metal sealing ring has extremely high air tightness and can provide almost zero leakage sealing effect.
High temperature resistance: Capable of operating at extremely high temperatures, usually over 500°C.
Corrosion resistance: Resistant to most chemical attacks.
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Suitable for sealing requirements in extreme high temperature and high vacuum environments.
Commonly used in the nuclear industry, high temperature furnace and aerospace and other fields.
conclusion
In the ultra-vacuum environment, it is very important to choose the right sealing material, and it is necessary to consider the chemical resistance, high temperature resistance, vacuum resistance and mechanical properties of the material. Fluororubber, perflurane rubber, silicone rubber, polytetrafluoroethylene and metal sealing rings are commonly used as ultra-vacuum sealing ring materials, and each material has its own unique advantages and application scenarios. According to the specific application requirements and environmental conditions, the selection of the most suitable material can ensure the long-term stability and reliability of the vacuum system.
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