Rubber seals are parts that prevent fluid or solid particles from leaking from adjacent joint surfaces and prevent foreign impurities such as dust and moisture from entering the interior of machinery and equipment.

Types of commonly used sealing devices

1. Compression molding most rubber seals use this molding method, such as various extrusion seals, rotary shaft lip seals, reciprocating lip seals, composite seals, film seals, bellows seals, etc.

2. Processing and forming, such as rectangular seal, piston ring seal, coaxial seal (or slip ring combination seal), etc.

3. Plate or strip type materials such as rubber, fiber reinforced rubber, bonding asbestos fiber, aramid fiber, etc., plate or strip type materials are mostly used for sealing gaskets or fillers, and rubber is used as the bonding of asbestos and its substitutes The aramid fiber and the formed rubber ring are sometimes used for the reciprocating seal of aerospace equipment.

The performance of the rubber seal material is an important factor to ensure effective sealing. The selection of the sealing material is mainly based on the working environment of the sealing element, such as the temperature, the working pressure, the working medium used, and the movement mode. The basic requirements for sealing materials are as follows:

1. Has certain mechanical properties, such as tensile strength, elongation, etc.

2. The rubber seal has proper elasticity and hardness, and the compression set is small.

3. High temperature and low temperature resistance, no decomposition and softening at high temperature, and no hardening at low temperature.

4. Compatible with the working medium, without swelling, decomposition, hardening, etc.

5. The rubber seal has good oxygen resistance and aging resistance, and is durable.

6. Wear-resistant and non-corrosive to metals.

7. Easy to form and process, low price.