What are the commonly used rubber sealing materials in the vacuum tank helium leak detection system
In vacuum system, rubber is a widely used vacuum sealing material, good elasticity, wear resistance and mechanical strength, widely used in low vacuum, high vacuum system. Next, you will be introduced to several rubber sealing materials commonly used in vacuum system sealing.
1, natural rubber
Natural rubber is often used as a vacuum sealing material in crude vacuum or low vacuum systems, with large air permeability, poor oil resistance, anti-aging performance, and high temperature resistance (generally used below 100 ° C).
What are the commonly used rubber sealing materials in the vacuum tank helium leak detection system
2, butyl rubber
Compared with natural rubber, butyl rubber has a small air permeability, so it can be used as a vacuum sealing material in the vacuum range of 10-5Pa, but if there is a higher vacuum, it is prone to sublimation, resulting in quality loss.
3, nitrile rubber
Nitrile rubber is a balanced synthetic rubber with good oil resistance, heat resistance, water resistance and low permeability, and can be modified by adding other materials, and can be used for various types of high vacuum seals at baking temperatures below 150℃.
4, polyurethane rubber
Polyurethane rubber has excellent mechanical strength and tear strength, oil, wear resistance, radiation resistance, impact resistance, but not resistant to high temperature, water and acid and alkali. Therefore, it is suitable for low-speed and good heat dissipation vacuum application environment, and can be used in vacuum equipment, vacuum valves and vacuum low-speed transmission components to obtain good sealing effect.
What are the commonly used rubber sealing materials in the vacuum tank helium leak detection system
5, fluorine rubber
The permeability of fluorine rubber is equivalent to butyl rubber, which can be used as a vacuum sealing material for high vacuum and ultra-high vacuum systems (10-5 ~ 10-7Pa), high temperature resistance and various media, and the effect of sunlight, ozone and environmental atmosphere is stable, but the price is high.
6. Silicone rubber
The heat resistance of silicone rubber is better than the above several rubber sealing materials, and it can be used for a long time at 200 ° C, and the working temperature range can reach -100 ~ 350 ° C. However, its gas permeability is high, ten to ten times that of ordinary rubber, and the coefficient of linear expansion is also large.
The helium mass spectrometry leak detector produced by Anhui Nuoyi Technology has been widely used in many industries with excellent quality and stable performance to meet various applications.