FDA Food Grade Certified NBR Rubber Sealing Ring EPDM/FKM

FDA Food Grade Certified NBR Rubber Sealing Rings, AFLAS Tetrafluoroethylene Propylene Rubber Sealing Rings FEPM, PFA Encapsulated O-Ring Seals Suzhou FEP Encapsulated Sealing Rings Manufacturer, Extra Large Size Seals NBR FKM Fluorocarbon VITON EPDM, Suzhou Mechanical Seal Repair, EPDM White Sealing Rings O-Rings FDA Food Grade SIL NBR, USP VI Medical Grade Medical Equipment Sealing Rings Manufacturer

Company Introduction:
Suzhou Yongxin Technology is a supplier of sealing components in motion and control systems, providing sealing solutions for transmission control, automation equipment, and aviation. We sell various seals, hydraulic, pneumatic, and fluid control products and components. In terms of seals, Yongxin offers hydraulic and pneumatic sealing products, including dynamic seals, static seals, sealing rings, oil seals, gaskets, packing, etc.

O-rings (also known as O-rings, O-rings, O-rings) are ring-shaped mechanical gaskets, which are ring-shaped elastomers with a circular cross-section. They are usually fixed in a groove and compressed by two or more components during assembly, thus creating a sealed interface. Because of their low price, simple manufacturing, reliable function, and simple installation requirements, O-rings are common mechanical designs for sealing. They can withstand pressures of tens of Pascals (thousands of pounds). O-rings can be used in static applications as well as in dynamic applications where there is relative movement between components, such as the shaft of a rotary pump and the piston of a hydraulic cylinder.

Rubber O-ring seals are mainly used to manufacture oil-resistant rubber products. The acrylonitrile content (%) in rubber O-ring seals is divided into five types: 42-46, 36-41, 31-35, 25-30, and 18-24. The higher the acrylonitrile content, the better the oil resistance, but the cold resistance decreases accordingly. It can be used in air at 120°C or in oil at 150°C for long periods. In addition, it has good water resistance, air tightness, and excellent bonding properties. It is widely used in the manufacture of various oil-resistant rubber products, various oil-resistant gaskets, spacers, sleeves, soft packaging, soft hoses, printing and dyeing rubber rollers, cable rubber materials, etc., and has become an elastic material in industries such as automotive, aviation, petroleum, and photocopying.

NBR rubber O-ring seals have excellent oil resistance. The typical NBR structure has about 78% trans configuration. Due to the presence of cyano groups in the molecular chain structure of NBR rubber O-ring seals, their oil resistance (such as resistance to mineral oil, liquid fuels, animal and vegetable oils, and solvents) is better than that of natural rubber, chloroprene rubber, and styrene-butadiene rubber. Compared with other rubbers, NBR has a wider range of use temperatures, with a long-term use temperature of 120°C. At the same time, NBR rubber O-ring seals have good low-temperature performance, with a glass transition temperature as low as -55°C.

NBR rubber O-ring seals have good chemical stability and processing performance. As the acrylonitrile content in their structure increases, the relative density increases, the vulcanization speed accelerates, the tensile strength improves, but the rebound performance decreases, and the cold resistance deteriorates. Because the cyano groups in NBR rubber O-ring seals are easily polarized by electric fields, the dielectric properties decrease, making them semiconductor rubbers. NBR rubber O-ring seals can be divided into five categories based on ACN content: ultra-high, high, medium-high, medium, and low acrylonitrile. The production methods are divided into continuous and intermittent polymerization. Continuous polymerization is usually used for large-scale production with low consumption. Intermittent polymerization is suitable for multi-variety and small-batch production, with high engineering consumption.

Although rubber has excellent physical and mechanical properties and processing performance, its long-term performance in acidic gasoline and high-temperature (150°C) environments is not as good as that of fluororubber and acrylate rubber. Therefore, hydrogenated rubber (HNBR) with excellent performance has been developed. In addition, rubber with extremely high cold resistance and high purity, as well as carboxylated rubber (XNBR), have also been developed.

Rubber O-ring seals are light brown elastomers with a molecular weight of about 700,000. Due to the strong polar CN group, they have excellent stability against aliphatic hydrocarbon oils and gasoline. They are classified based on ACN content:

High rubber: ACN content 36%-42%

Medium-high rubber: ACN content 31%-35%

Medium rubber: ACN content 25%-30%

Low rubber: ACN content below 24%


Rubber O-ring seals have good heat resistance. Their heat resistance is better than that of natural rubber and styrene-butadiene rubber, with a long-term use temperature of up to 100°C, and they can be used at 120°C for 40 days. [1]

① The ozone resistance of O-ring seals is worse than that of CR but better than NR.

② O-ring seals are reinforced to give the rubber better physical and mechanical properties and wear resistance.

③ When the acrylonitrile content of the rubber is 39%, the air tightness of O-ring seals is comparable to that of IIR rubber, and the air tightness is good.

④ The low-temperature flexibility of O-ring seals is average.

⑤ O-ring seals have excellent anti-static properties.

⑥ O-ring seals have good plasticizing effects with polar esters.

⑦ O-ring seals have good compatibility with polar substances, such as PVC, alkyd resins, and nylon.

⑧ O-ring seals have low self-adhesion and generate more heat during the mixing process.

Excellent Oil Resistance

Rubber O-ring seals are one of the excellent rubbers with comprehensive properties such as oil resistance, physical and mechanical properties, and chemical resistance. Making full use of these characteristics can meet various applications. Among general-purpose rubbers, NBR rubber's resistance to benzene, petroleum-based oils, and non-polar solvents is far better than that of non-polar rubbers such as NR, SBR, and IIR, and also better than the polar CR. However, the performance of rubber in polar solvents and polar oils is not good enough.
After-Sales Service:
Yongxin Seals provides material certificates for all products, allowing customers to buy and use with confidence, without any worries! Customized packaging and delivery methods are available according to customer requirements to meet different customers' cleanliness requirements for products. We also welcome friends in trading to inquire about cooperation!

Technical Support:
In the field of seals, Yongxin Seals hires industry technical support. At the same time, our engineering team has over 10 years of experience and is ready to help customers solve product sealing design problems, material selection difficulties, seal aging test issues, etc. We welcome inquiries from peers and friends in need of seals.