Gereal Introduction:

Lixu Rubber mainly produces various sizes of rubber O-rings, such as nitrile rubber(nbr) O-rings, silicone O-rings, fluorine rubber(Viton or FKM) O-rings, EPDM rubber O-rings, HNBR O-rings, etc. Rubber O-ring is a type of rubber sealing ring with a circular cross-section. Due to its O-shaped cross-section, It is called an O-ring rubber sealing ring. It is usually made of synthetic rubber or natural rubber and is mainly used for sealing purposes, widely used in various mechanical equipments.

Structure and working principle

The structure of rubber O-ring is simple, the installation part is compact, and the weight is relatively light. It has a self sealing effect and usually only requires one sealing component to achieve the sealing effect. The O-ring achieves sealing through its elastic deformation within a well-designed groove. When subjected to pressure, Its cross-section changes from circular to elliptical,Thereby sealing the gap and achieving a sealing effect.

The Main O Ring Material characteristics:

The materials for rubber O-rings usually include nitrile rubber, fluororubber, chloroprene rubber, EPDM rubber, silicone rubber, natural rubber, SBR rubber and HNBR rubber, etc. These materials have good sealing performance and long working life, especially outstanding performance in static and dynamic pressure sealing. The names and characteristics of their main materials are as follows:

Nitrile rubber (NBR): It has good oil resistance, wear resistance, and aging resistance, and is suitable for sealing requirements at low temperatures, low pressures, and low speeds. But it is prone to hardening and aging in high temperature and high pressure environments.

Fluororubber (FKM): It has excellent oil resistance, heat resistance, and chemical corrosion resistance, and is suitable for sealing requirements in harsh environments such as high temperature, high pressure, and high speed. But the price is high and not suitable for low-cost applications.

Chloroprene rubber (CR): It has good oil resistance, cold resistance, and weather resistance, and is suitable for sealing requirements at low temperatures, low pressures, and low speeds. But it is prone to aging in high temperature and high pressure environments.

Ethylene propylene rubber (EPDM): It has excellent oxidation resistance, ozone resistance, and weather resistance, and is suitable for sealing requirements in outdoor environments. But it is prone to hardening in high temperature and high pressure environments.

Silicone rubber: It has excellent high temperature resistance (up to 230 ° C), good oil and chemical resistance, and is suitable for sealing requirements in high temperature environments.

Natural rubber: Has good elasticity and wear resistance, suitable for general sealing needs, but may soften in high temperature environments.

HNBR rubber: has excellent heat resistance, oil resistance, chemical medium resistance, low temperature resistance, as well as good mechanical and processing properties.soften in high temperature environments. Suitable for components such as synchronous toothed belts in automobiles that require high dynamic performance.

SBR rubber: has excellent wear resistance, good oil and high temperature resistance, excellet erosion of oil and high temperature to a certain extent,suitable for manufacturing products that require friction, such as tires.

These materials each have their own advantages and disadvantages, and choosing the appropriate material depends on the specific usage environment and requirements. For example, fluororubber is suitable for high temperature and high pressure environments, while nitrile rubber is more suitable for low temperature and low pressure environments.

What are the international standards for the size of O-rings?

There are multiple international standards for the size of rubber O-rings, mainly including the following:

The American AS 568 standard: This is a size standard published by the Society of Automotive Engineers (S.A.E.) and widely used in many industries in the United States and around the world. The AS 568 standard specifies tolerances and size identification codes for inner diameters, cross-sections, sealing applications, and straight O-rings

British BS 1806 standard: This is a size standard published by the British Standards Institution, which lists all British standard sizes. BS 1806 has been replaced by BS ISO 3601, but it is still widely cited, especially for cross reference purposes in certain industries and regions

The JIS B 2401 standard: is a technical specification for O-rings in the Japanese Industrial Standards (JIS). This standard provides detailed specifications for the material, size, hardness, tensile strength, and elongation of O-rings, and is applicable to sealing requirements in various industrial applications. ‌

International ISO 3601 standard: The ISO 3601 standard published by the International Organization for Standardization (ISO) includes two sets of circles, Class A and Class B. Class A complies with the current specifications of American standard AS 568B, while Class B allows for technically acceptable and economical metric size O-rings

You can refer to our O-ring size chart to choose the size that suits you, or we can customize the size according to your drawing requirements to meet your needs !

Rubber O Ring Main Property:

The performance characteristics of rubber O-rings mainly include the following aspects:

Excellent sealing performance: Rubber O-rings are widely used in hydraulic and pneumatic systems, and their unique circular cross-section design allows them to perform well in both dynamic and static sealing situations. In static sealing, there is almost no leakage; In dynamic sealing, the dynamic friction force is small and suitable for situations where there is relative motion between components, such as the sealing of hydraulic cylinder pistons and rotating shafts.

Long service life: The dynamic pressure sealing service life of rubber O-rings is 5-10 times longer than that of conventional rubber sealing products, and can even reach tens of times under certain conditions. Sometimes, it can have the same service life as the sealing substrate

Easy installation: Due to its compact structure and simple and convenient installation and disassembly process, it is suitable for various installation environments.

Affordable price: Rubber O-rings are usually made of rubber material, with lower costs and relatively cheaper prices

Material characteristics: Rubber O-rings are usually made of various rubber materials, such as nitrile rubber, fluororubber, silicone rubber, etc. They have good elasticity and wear resistance, and can deform and tightly adhere to the contact surface under pressure, thereby achieving reliable sealing. Customers can choose the appropriate rubber material according to their application needs.

Wide applicability: Suitable for various working conditions, including high temperature, low temperature, high pressure and other environments. However, the low-temperature environment may affect its sealing performance, as rubber shrinks and becomes thinner at low temperatures, which may lead to leakage.

The above is the general feature of rubber o rings, Different rubber materials have different advantage and disadvantages, Please check our materials introduction to check more details to see which materials o ring is most suitable for your sealing requirements.

Application Range:

Rubber O-rings have a wide range of applications in various fields, mainly including the following aspects:

Rubber O-rings are widely used in various fields and scenarios, mainly including the following aspects:

Automotive industry: In automobiles, rubber O-rings are used to seal fuel systems, lubricating oil systems, and high-temperature exhaust systems (such as turbocharging systems), with a temperature range of -20 ° C to over 200 ° C. It is also used to seal fuel injectors, fuel pipelines, prevent corrosion of gasoline, diesel, and additives, and resist the erosion of refrigerants in air conditioning systems.

Aerospace: In the aerospace field, rubber O-rings are used to seal hydraulic oil and aviation fuel, adapting to extreme temperature and high-pressure environments. It can also withstand high temperature exhaust gas and lubricating grease, ensuring reliable operation of the engine.Petrochemical industry: In the field of petrochemicals, rubber O-rings are used to seal strong acids, strong bases, hydrocarbons, and organic solvents, and are suitable for acidic medium environments in refineries. Under high temperature and pressure, it can resist corrosive chemicals and extend equipment life.

Semiconductors and Electronics: In the semiconductor and electronics industry, rubber O-rings are used for sealing in high-purity processes such as CVD and etching equipment, and are resistant to high-purity gases (such as chlorine and fluorine) and plasma. In a vacuum system, it can maintain sealing under low volatility conditions, avoiding contamination of sensitive environments.

Household appliances: In household appliances such as washing machines and refrigerators, rubber O-rings prevent moisture and dirt from entering the interior of the machine, extending its service life. It ensures the sealing inside the electrical appliance, preventing leakage and other faults.

Hydraulic system: Rubber O-rings are also widely used in hydraulic systems, especially for piston sealing in reciprocating hydraulic cylinders. Due to its excellent sealing performance and high working life, the dynamic pressure seal has a working life 5-10 times longer than conventional rubber sealing products, and can even have the same lifespan as the sealing substrate under certain conditions.

As a professional manufacturer of O-rings made of various rubber materials, Lixu Rubber is willing to provide our customers with high-quality and affordable O-ring products. You can contact us and let us know your needs. Our team will provide you with the best solution as soon as possible.‌