Are you looking for the best o-ring sealant factories in China? With so many options available, it can be overwhelming to choose the right one. In this article, we’ll compare some of the top o-ring manufacturers in China, highlighting their strengths, product ranges, and what sets them apart. Let’s dive in and find the perfect fit for your needs.

China O Rings Manufacturers and Suppliers

FKM O Rings, China NBR O Ring supplier

China O-Ring Kits Suppliers – NNK oil seal

Product Details: The Universal Type O-Ring Kit Box 30 size is a professional-quality assortment of O-rings. It includes 382 pieces of O-rings in 30 of the most popular sizes, both in inches and millimeters. The O-rings are made from commercial-grade nitrile butadiene rubber (NBR) and fluoroelastomer (FKM) materials, offering oil, chemical, and high-pressure resistance. The kit is suitable for various applications, including machines and excavators. The O-rings have a hardness range of 60-90 Shore A and can operate in temperatures from -40°C to 260°C. The kit comes in a practical resealable plastic case and is certified with ISO9001/TS16949 standards.

Pros:
– High-quality materials (NBR and FKM) providing excellent oil and chemical resist…
– Wide range of sizes (30 sizes) to fit various applications
– Suitable for high-pressure and harsh environments
– Durable and long-lasting with UV resistance
– Practical resealable plastic case for storage
– Meets ASTM D 2000 and ISO9001/TS16949 standards

Cons:
– Limited to specific materials (NBR and FKM), which may not be suitable for all a…
– No mention of availability for custom sizes or special orders beyond the standar…
– May require additional backup rings for elevated operating pressure environments

Xiamen Xlong Seal Co.,Ltd 厦门旭隆密封件有限公司

Top 10 O-ring Manufacturers and Suppliers in China (2024)

Product Details: Hongju produces high-quality silicone rubber O-rings and high-temperature O-ring seals. These O-rings are used in various applications such as engines, pumps, cylinders, connectors, and valves. The company offers both standard sizes and custom-made O-rings to meet specific customer needs. The manufacturing process includes O-ring design, tool making, color mixing, compression molding, and quality inspection. The products comply with ISO 3601 standards and can be made from various materials including silicone, EPDM, fluoro rubber, Viton, and more. The company also provides options for liquid silicone rubber and ensures the products meet international safety standards like CE, SGS, REACH, and ROHS Directive

requirements[1][3][4].

Pros:
– High-quality silicone rubber O-rings with strong resistance to water, oil, and h…
– Customization capabilities to meet specific customer requirements
– Strict quality control and compliance with international safety standards
– Wide range of materials available including silicone, EPDM, fluoro rubber, Viton…
– Advanced equipment and experienced staff ensure reliable quality and timely deli…
– Low minimum order quantity (MOQ) and rapid prototyping options
– Products are eco-friendly and certified by ISO 9001, CE, FDA, and other standard…

Cons:
– Importing from a Chinese manufacturer may involve longer shipping times
– Factory inspections may be limited due to epidemic restrictions, though online i…
– Production cycle can vary depending on the quantity and complexity of the order

O-Rings, Rubber Seals – Best China Manufacturer & …

Product Details: Savvy manufactures a wide range of o-rings made from various materials including rubber, metal, and other materials. The most commonly used o-ring materials are NBR, FKM (Viton), and Silicone. NBR is widely used due to its good properties and low cost. FKM/Viton offers the best comprehensive performance and is used in high-standard sealing equipment. Silicone is often used in medical and food industries due to its high-temperature resistance, tastelessness, and non-toxicity. Other materials include EPDM, HNBR, CR, and Aflas. O-rings are available in various hardness levels measured in Shore A, typically ranging from 40 to 90, with 60-70 being the

most common. They can be produced in different colors and custom sizes.

Pros:
– High-temperature resistance (e.g., Silicone: -70°C to 220°C)
– Good chemical resistance (e.g., FKM/Viton with excellent comprehensive performan…
– Low cost (e.g., NBR is cost-effective)
– Wide range of materials available for different applications
– Customizable sizes, shapes, and colors
– High wear resistance and durability
– Suitable for various industries including medical, food, and automotive

Cons:
– Low hardness o-rings are prone to peeling, installation damage, extrusion, and p…
– High hardness o-rings can be inconvenient to install
– Unique colors may increase cost and require larger MOQ with longer delivery time…

China Silicone O Ring

Product Details: Silicone O-rings are synthetic elastomers based on silicon, with pendant organic groups such as methyl, phenyl, and vinyl attached to silicon atoms. They are available in various types, including VMQ, PVMQ, and FVMQ, and can be formulated to meet specific requirements such as FDA, USP Class VI, and other industry standards. They are used in a wide range of applications including medical, automotive, aerospace, and electronics.

Pros:
– Excellent heat, ozone, and corona resistance
– Good dielectric stability and resistance to many oils, chemicals, and solvents
– Retention of flexibility and low compression set characteristics over a wide tem…
– Non-toxic biocompatibility, making them suitable for medical and food applicatio…
– Excellent resistance to UV light, weathering, and fungal growth
– Can be formulated to be conductive or insulating and available in various colors

Cons:
– Low tensile strength and low wear and tear resistance
– Not suitable for concentrated acids and alkalis, steam over 120°C (248°F), petro…
– Higher cost for platinum-cured silicone O-rings due to the need for clean room p…
– May stretch easily during installation if in low durometer and thin cross-sectio…

Perfluoroelastomer FFKM O ring Manufacturer

Product Details: FFKM O-rings are made of perfluoroelastomer compounds with a higher fluorine content than FKM fluoroelastomers. They are known for their excellent resistance to chemical corrosion, organic and inorganic acids, alkali, ester, ether, ketone, aldehyde, superheated water, and steam. The maximum operating temperature is 230 °C (446 °F), and they can be fabricated into various forms such as O-rings, diaphragms, gaskets, rubber strips, and rubber plates. Key mechanical properties include a hardness of Shore A 78, 100% modulus of 9.4 MPa, tensile strength of 15.9 MPa, elongation at break of 130%, and a compression set of 20.7% at 204 °C[1].

Pros:
– Highest temperature resistance among rubber O-ring materials, up to 620 °F (327…
– Excellent chemical resistance to a wide range of aggressive chemicals, including…
– High thermal, oxidative, and chemical stability due to carbon-fluorine bonds[1][…
– Long service life and reliability in dynamic and static applications[3][4] – Low off-gassing and extractable levels, making them suitable for clean and sensi…

Cons:
– Poor low temperature performance, with limited flexibility below certain tempera…
– Significantly more costly than standard FKM materials[3] – Lower tensile strength compared to some other elastomers, though sufficient for…

HNBR O Ring China Rubber O-Ring Seal

Product Details: HNBR O-rings are made from a synthetic polymer obtained by saturating the double bonds in nitrile’s butadiene segments with hydrogen. This process enhances their heat, ozone, chemical resistance, and mechanical characteristics. They are available in 70, 80, and 90 durometers and have varying Acrylonitrile (ACN) content from 17% to 49%. Standard HNBRs typically have 36% ACN content. They are peroxide-cured but can also be sulfur-cured for improved flexibility in dynamic systems. HNBR O-rings operate within a temperature range of -40°C to 150°C (-40°F to 300°F) and are resistant to petroleum-based oils, fuels, aliphatic hydrocarbons, vegetable oils, silicone oils and greases,

ethylene glycol, water, steam, and diluted acids, bases, and salt solutions.

Pros:
– Superior heat, ozone, and chemical resistance
– Enhanced mechanical characteristics over standard Nitrile
– Resistant to petroleum-based oils and fuels, aliphatic hydrocarbons, vegetable o…
– Good performance in water and steam up to 300°F
– Resistant to diluted acids, bases, and salt solutions
– Suitable for high dynamic loads and has good abrasion resistance
– Excellent weathering resistance and longevity in demanding applications

Cons:
– Not compatible with chlorinated hydrocarbons, ketones, ethers, esters, and stron…
– Higher ACN content reduces low-temperature properties
– Sulfur-curing reduces heat resistance and causes inferior compression set

Seals And O-Rings | Mantrac China | Caterpillar Dealer

Product Details: Mantrac Group offers a range of seals and O-rings, specifically designed for Caterpillar machines, equipment, and power systems. These products include high-quality seals to fill gaps and improve operational efficiency. The range covers over 1,000 options to meet various parts needs and applications. The seals are made from proprietary Cat urethane material, which provides improved performance with 25% better compression and a wider range of temperature applications. Key products include double lip wiper seals, U-cup seals, and pressure-activated buffer seals. These seals are designed to enhance performance, reduce leakage, and increase seal life.

Pros:
– Improved performance with 25% better compression
– Wider range of temperature applications
– Durable seals that don’t degrade easily, increasing service intervals and profit…
– Optimum contact with the rod to keep out contaminants
– Minimize pressure buildup, reducing U-cup failure
– Enhanced performance, reduced leakage, and increased seal life

Cons:
– No specific cons mentioned in the provided sources.

Comparison Table

Frequently Asked Questions (FAQs)

What types of materials do o-ring sealant factories in China typically use?

O-ring sealant factories in China use a variety of materials to manufacture o-rings, including Nitrile (NBR), Ethylene Propylene Diene Monomer (EPDM), Fluororubber (FKM), Silicone (VMQ), and Hydrogenated Nitrile Butadiene Rubber (HNBR). These materials are chosen based on the specific application requirements, such as chemical resistance, temperature tolerance, and durability.

Can I customize o-rings according to my specific needs?

Yes, you can customize o-rings to fit your specific requirements. Many Chinese o-ring manufacturers, such as Savvy and SWKS Seal, offer custom molding services where they can produce o-rings in various sizes, shapes, and materials based on your designs and drawings. This ensures that the o-rings meet your exact specifications.

What are the common applications of o-rings produced in China?

O-rings produced in China are widely used in various industries, including aerospace, automotive, hydraulic and pneumatic systems, medical equipment, and military applications. They are essential for sealing fluids such as air, water, and oil, and are used in both static and dynamic sealing conditions.

How do Chinese o-ring manufacturers ensure quality and reliability?

Chinese o-ring manufacturers ensure quality and reliability through rigorous quality control processes. Companies like Jiangyin No.3 Rubber Manufacturer and DMS Seals Technology Co., Limited conduct thorough tests on each product before shipping. They also adhere to international standards such as ISO 9001, ISO 14001, and IATF16949 to guarantee high-quality products.

What is the typical lead time and delivery process for o-ring orders from China?

The lead time for o-ring orders from China can vary, but many manufacturers offer prompt delivery services. For example, Savvy and Xiamen Lindas Hardware Industrial Co., Ltd. provide fast delivery options, including door-to-door courier services, to ensure that your orders are delivered quickly and efficiently. Minimum order quantities (MOQs) also vary among manufacturers, but they often start from a few hundred pieces.