Since 2006, Focus on rubber seals

What factors should be considered when choosing an O-ring?

by:ORK      2022-10-28
What factors should be considered when choosing an O-ring? O-type sealing rings are generally produced from nitrile rubber, natural rubber, neoprene, ethylene propylene rubber, fluorine rubber, silica gel and their blends. Due to the different characteristics of various materials, the processed rubber seals The characteristics, advantages and disadvantages of the rings are not the same. The main uses of the silicone rubber sealing rings with different characteristics of the raw material engineering projects and the environmental standards are also quite different. Therefore, the sealing ring must be selected according to the customer's requirements for the characteristics of the sealing ring. For the material, only then can the service life of the sealing ring be guaranteed. Elements that should be fully considered in the selection of O-ring seals 1. Substances and working standards in work When actually selecting the raw materials of O ring manufactures, the first thing to consider is the compatibility with the working substances. It is also necessary to fully consider the working standards such as pressure, temperature, continuous operation time, and operation cycle time at the sealing place. If it is used in rotating places, the temperature rise caused by frictional heat must be considered. Different seal raw materials have different mechanical properties and chemical properties, see ' Seal Raw Material Properties Table'. 2. The sealing method can be divided into packing sealing and dynamic sealing according to the type of load; according to the main purpose of sealing, it can be divided into hole sealing, shaft sealing and rotating shaft sealing; according to its assembly method, it can be divided into tangential assembly and radial assembly assembled. When tangentially assembled, for the sealing performance of the shaft, the error between the nominal diameter of the O-ring and the diameter of the sealed aperture d2 should be as small as possible; for the sealing performance of the hole, the nominal diameter should be equal to or slightly lower than the pipe groove. The aperture d1. Everyone knows that the selection of raw materials for O-type silicone seals has major practical significance for its sealing function and service life. The characteristics of raw materials can directly affect the performance indicators of O-rings. In addition to the general requirements for sealing ring materials, O-rings also need to pay attention to the following standards: 1. Quite elastic and resilient; 2. Moderate impact toughness, including increased compressive strength, elongation and wear resistance and compressive strength strength, etc. 3. The characteristics are stable, it is not easy to swell in the material, and the effect of heat shrinkable film (Joule effect) is small. 4. It is easy to manufacture and form, and can maintain high-precision specifications. 5. It does not corrode the contact area and does not pollute the environment. The most suitable and frequently used raw material to meet the above requirements is plastic, so most O-rings are made of plastic materials. There are many types of plastics, and new types of plastics continue to emerge. When designing and adopting, you should master the characteristics of various plastics and select them effectively.
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