Are you looking for the best o-ring manufacturers in China? With so many options available, choosing the right one can be overwhelming. In this article, we’ll compare the top o-ring factories 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

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 widely used in various applications such as engines, pumps, cylinders, connectors, and valves. The company offers both standard and custom-made O-rings to meet specific customer needs. The manufacturing process includes 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

Cons:
– Importing from China may involve longer shipping times
– Factory inspections may be limited due to epidemic restrictions, though online i…

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, with rubber being the most commonly used. 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 FDA compliance, tastelessness, non-toxicity, and resistance to high temperatures and severe cold. O-rings are available in various hardness levels, typically measured in Shore A units, ranging from

40 to 90, with 60-70 being the most common. They can also be produced in various colors, with standard colors including Black for NBR, Green for HNBR, Brown for Viton, and Red/Transparent/White for Silicone.

Pros:
– Good property and low cost of NBR
– Best comprehensive performance of FKM/Viton
– FDA compliance, tastelessness, and non-toxicity of Silicone
– High-temperature and severe cold resistance of Silicone
– Wide range of hardness levels and colors available
– Custom o-rings can be made at low mold/tooling cost with fast delivery

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 O-Ring Kits Suppliers – NNK Oil Seal

Product Details: O-ring kit boxes are designed to provide a comprehensive range of O-rings in various sizes and materials. These kits typically include multiple pieces of O-rings made from materials such as NBR (Nitrile), Silicone, FKM, EPDM, and others. The kits are organized in hard-wearing storage boxes, often with separate compartments for each size. They are used in hydraulic, pneumatic, and other industrial applications to seal joints and prevent leaks of liquids and gases. The kits are available in different configurations, such as standard AS568A sizes, metric sizes, and specialized kits for specific industries like automotive and construction equipment[1][2][4].

Pros:
– Provides a wide range of O-ring sizes and materials to meet various application…
– Enhances sealing performance and prevents leaks in high-pressure environments.
– Customization options available to tailor the kit to specific requirements.
– High-quality materials and rigorous manufacturing standards ensure reliability a…
– Suitable for many industrial applications, including hydraulics, pneumatics, and…

Cons:
– May not be suitable for safety-critical applications without premium quality ass…
– Storage and organization can be complex due to the large number of pieces and si…
– Material limitations; for example, NBR is not resistant to certain chemicals lik…

O-Rings | China – Products | Parker NA

Product Details: Parker O-rings are circular sealing elements with circular cross-sections, primarily used in static applications. They are specified by their inside diameter and come in various materials such as Nitrile (NBR), Fluorocarbon (FKM, FPM), Ethylene Propylene (EPDM), Hydrogenated Nitrile (HNBR), Silicone (VMQ), and others. Each material is tailored for specific applications, including automotive, chemical processing, pharmaceutical, and general industrial uses. For example, FKM O-rings are excellent for oil & gas and dynamic applications due to their compatibility with oils, gases, hydraulic oils, and fuels. EPDM O-rings are focused on food & beverage, chemical processing, and pharmaceutical applications, while HNBR O-rings offer

good mechanical robustness for automotive and heavy-duty applications[5].

Pros:
– Wide range of materials to suit various applications
– Excellent chemical and temperature resistance depending on the material
– Ease of service with no smearing or retightening required
– No critical torque on tightening, reducing the risk of structural damage
– Compact and lightweight design
– Cost-effective and reusable in many cases
– Gradual and easily identifiable failure mode

Cons:
– Material compatibility issues with certain fluids and chemicals (e.g., NBR not c…
– Specific materials may have limitations in cold flexibility or short-term reboun…
– Potential for extrusion in high-pressure applications without proper back-up rin…
– Some materials may not be suitable for high-purity applications without special…

China NBR HNBR FKM PTFE O Ring Manufacturer

Product Details: O-rings are seals with a solid rubber material or PTFE and an O-shaped cross section. They are widely used in hydraulic and pneumatic transmission systems to prevent the leakage of liquid and gas media under static conditions. They can also be used as dynamic sealing elements for axial reciprocating motion and low-speed rotating motion. The materials available include NBR, HNBR, FKM, PTFE, and others. The working temperature range depends on the material, typically from -32 to +204°C. O-rings are effective and economical for both fixed seal and dynamic seal applications.

Pros:
– Effective and economical for both fixed seal and dynamic seal applications.
– Can be used in various conditions including oil, water, air, and gas.
– Available in different materials to suit different conditions.
– Prevents leakage of fluids effectively.
– Used in mechanical parts to ensure sealing under static and some dynamic conditi…

Cons:
– Limited by the speed and pressure at the seal in dynamic situations.
– Not suitable for all types of fluids; for example, HNBR o-rings are not preferab…

Xiamen Xlong Seal Co.,Ltd 厦门旭隆密封件有限公司

Custom O-Rings, Custom Molded O-Ring China …

Product Details: Savvy Rubber offers custom o-rings designed and produced in various cross-sections and shapes. These o-rings are necessary when standard o-ring sizes are not available. Key details include the need for inner diameter (ID) and cross-section (CS) measurements for round custom o-rings, and a detailed drawing for non-round shapes such as square, rectangular, or irregular shapes. The production process involves making a mold based on the provided specifications. Custom o-rings are used in industries like hydraulics, oil and gas, semiconductor processing, aerospace, food processing, water filtration, electronic products, machinery fabrications, plastic sealing, automotive, and medical equipment. Materials include rubber compounds like

NBR, FKM, and Silicone, with hardness levels measured in Shore A units[1].

Pros:
– Custom o-rings can be tailored to specific application requirements, ensuring a…
– Savvy Rubber has strong cost control management, offering high-quality custom o-…
– The company provides a wide range of material options, including FDA-grade mater…
– Fast delivery and low mold/tooling costs are available, making the process effic…

Cons:
– Custom o-rings are used less frequently than standard o-rings, resulting in high…
– The process requires close communication and cooperation between the customer an…
– Unique colors or non-standard materials may increase costs and require larger mi…

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 manufactured 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% after 70 hours at

204 °C[1].

Pros:
– High temperature resistance up to 620 °F (326 °C)[1][3] – Excellent chemical resistance to a wide range of aggressive chemicals, including…
– Long service life and reliability in both dynamic and static applications[3][4] – Low off-gassing and extractable levels, making them suitable for clean and sensi…
– High thermal, oxidative, and chemical stability due to carbon-fluorine bonds[3]

Cons:
– Significantly more costly than standard FKM materials[3] – Poor low temperature performance[3] – Lower tensile strength compared to some other elastomers[4]

FKM O Ring Viton Rubber Oring

Product Details: Viton® / FKM O-rings are made from a high-performance fluorocarbon rubber known for its excellent resistance to high temperatures, ozone, weather, oxygen, mineral oil, fuels, hydraulic fluids, aromatics, and many organic solvents and chemicals. They are available in various formulations such as A-type, B-type, F-type, GLT-type, and ETP Extreme. The service temperature range is typically from -26°C to 232°C in static applications and -15°C to 200°C in dynamic applications. The hardness ranges from 50 to 90 Shore A[1][3][4].

Pros:
– Excellent resistance to high temperatures, oils, solvents, and chemicals
– Wide temperature range: -50°C to +205°/230°C (-15°F to +400°/440°F)
– Low compression set and low gas permeability
– Exceptional resistance to aging, chemical, and ozone attacks
– Suitable for applications in automotive, chemical processing, aerospace, and oth…

Cons:
– Not recommended for use with steam, amines, or polar solvents
– Incompatible with ketones (MEK, acetone), Skydrol fluids, low molecular weight e…
– Limited use in applications involving glycol-based brake fluids

Comparison Table

Frequently Asked Questions (FAQs)

Frequently Asked Questions About O-Ring Type Factories in China

What materials are commonly used to make o-rings in Chinese factories?

Chinese o-ring factories typically use a variety of materials, but the most common ones are rubber compounds such as NBR (Nitrile Butadiene Rubber), FKM (Fluororubber or Viton), and Silicone. These materials are chosen based on their properties and the specific application requirements, such as resistance to chemicals, temperature, and wear.

Can Chinese o-ring factories produce custom sizes and shapes?

Yes, many Chinese o-ring factories offer custom manufacturing services. They have extensive mold libraries and can produce o-rings in various sizes and shapes according to your specifications. This includes encapsulated o-rings, backup-rings, x-rings, and other specialized types.

What international standards do Chinese o-ring factories follow?

Chinese o-ring factories often adhere to multiple international standards, including AS568 for the USA, BS1516 for the UK, DIN 3771 for Germany, JIS B 2401 for Japan, ISO 3601 for international use, and GB 3452.1 for China. This ensures that the o-rings meet the quality and size requirements of different markets.

How do I choose the right material for my o-ring application?

Choosing the right material depends on the specific conditions your o-ring will be subjected to. For example, NBR is good for general use and is cost-effective, FKM (Viton) is excellent for high-temperature and chemical-resistant applications, and Silicone is ideal for medical and food industries due to its non-toxic and temperature-resistant properties.

What certifications should I look for in a Chinese o-ring factory?

When selecting a Chinese o-ring factory, look for certifications such as ISO 9001 for quality management, ISO 14001 for environmental management, and ISO 13485 for medical devices. These certifications indicate that the factory meets stringent quality and safety standards, ensuring you receive high-quality products.