Speaking of sealing rings, I believe everyone knows that they are indispensable in every industry and daily life. Sometimes we need to use them to prevent water leakage, dust, oil leakage, and so on.
The selection of sealing ring material is of great significance for its sealing performance and service life. The performance of the material directly affects the usability of the sealing ring.
Sealing rings are used in various transmission systems, and the performance of sealing rings directly affects the performance of transmission equipment. Good sealing rings need to be considered from the material first. If the material of the product is not up to standard, then fine processing skills cannot be reflected. Therefore, what issues should we pay attention to in the selection of sealing ring materials?
1. Sealing ring material and working pressure
Sealing ring materials are also very sensitive to working pressure, and sealing rings made of different materials can be classified as pressure resistant, oil resistant, and temperature resistant. In terms of oil seals, the working pressure they bear is relatively small. If it exceeds their bearing range, it will not only cause leakage but also reduce the service life of the sealing ring.
2. Sealing ring material and operating temperature
Excessive or insufficient temperature can affect the performance of the sealing ring. Excessive temperature will reduce the hardness and stretchability of the sealing ring, while insufficient temperature will make the sealing component brittle. So each sealing material has its own limit temperature that it can adapt to.
3. Compatibility between sealing ring material and working medium
The material of the sealing ring will come into direct contact with the medium. If there is no good compatibility between them, it will not only damage the sealing ring but also contaminate the sealing medium. The material of the sealing ring should not be corroded, worn, or undergo chemical reactions by the sealing medium.
4. Sealing ring material and mechanical motion speed
The adaptability of sealing materials to mechanical motion speed also varies.
For static sealing, there is no relative motion between the sealing ring and the sealed component, so the requirements for material wear resistance and hardness are not high.
For dynamic seals, the material of the sealing ring has different adaptability to mechanical motion speed. Some ordinary materials cannot adapt to high-speed mechanical operation. Therefore, when selecting the material of the sealing ring, it is necessary to choose higher wear-resistant and high-strength materials in order to use high-speed operation.
The materials for sealing rings include nitrile rubber, carboxylic nitrile rubber, fluororubber, ethylene propylene rubber, hydrogenated nitrile rubber, silicone rubber, chloroprene rubber, fluorosilicone rubber, polyurethane, chlorohydrin rubber, styrene butadiene rubber, butyl rubber, natural rubber, ethylene/vinyl acetate rubber, polyacrylate rubber, perfluororubber, and so on.
Rubber sealing rings have excellent aging performance, high tear resistance, excellent resilience, long-term deformation resistance, weak acid and alkali resistance, high and low temperature resistance, etc. They can be used at -50 ° C to 250 ° C, with special requirements up to 300 ° C. They have excellent insulation, high breathability, good physiological inertia, and physiological stability. Due to its excellent performance, rubber is widely used for sealing mechanical hardware, electronic appliances, and small household appliances.
Silicone sealing rings are non-toxic and odorless, with good resistance to corona discharge, arc, aging, high and low temperatures, as well as strong elasticity and tensile strength. They can achieve continuous cracking and deformation under very strong tensile forces. Often used in daily necessities, electronic accessories, waterproof seals for mobile phones, mechanical oil seals, and any other industry
Silicone sealing rings also have strong adaptability to the environment. They can be placed under high temperatures and heated to maintain their original shape and state, achieving complete non deformation. Moreover, they will not produce any harmful substances in high temperature environments.
Due to different formulations, the performance indicators of the same type of rubber can vary greatly, so each material of sealing ring has its own advantages and disadvantages. We cannot completely say which sealing ring material is good. Different industries require the selection of different materials to meet the requirements of the working environment and working medium.