The sealing material shall meet the requirements of sealing function. Due to different sealing media and different working conditions of equipment, sealing materials are required to have different adaptability. The requirements for sealing materials are generally as follows:

1. The material has good compactness and is not easy to leak;

2. Proper mechanical strength and hardness;

3. Good compressibility and resilience, small permanent deformation;

4. It does not soften and decompose at high temperature, and does not harden and crack at low temperature;

5. It has good corrosion resistance, can work for a long time in acid, alkali, oil and other media, has small change in volume and hardness, and does not adhere to the metal surface;

The friction coefficient is small and the wear resistance is good;

7 has flexibility combined with sealing surface;

Good aging resistance and durability;

9. The processing and manufacturing process is convenient, the price is relatively cheap, and it is easy to get materials.

Rubber is the most commonly used static sealing materials, common are: fluororubber, silicone rubber, EPDM rubber and so on.

The general rubber sealing products are widely used in national defense, chemical industry, coal, petroleum, metallurgy, transportation and machinery manufacturing industries, and have become the basic parts and accessories in various industries.

In addition to rubber, suitable for sealing materials and graphite, as well as a variety of sealants. Nowadays, some seals use plastics as raw materials, mainly including peek, PI, PTFE and Pai. These high temperature polymers will become the trend of seal manufacturing technology in the future, and the price of seals will become more and more expensive.