Are you looking for the best o-ring manufacturers in China to meet your specific needs? With numerous top-notch factories available, choosing the right one can be daunting. Let’s dive into a comparison of China’s leading o-ring material factories, highlighting their unique strengths, materials, and services to help you make an informed decision. From customized solutions to high-quality materials, we’ll explore what sets each of these manufacturers apart.

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 and custom-made O-rings to meet specific customer needs. The manufacturing process includes design, tool making, color mixing, compression molding, quality inspection, and packaging. Hongju adheres to ISO 3601 standards for dimensions and tolerances and uses high-quality raw materials. The company also provides options for using liquid silicone rubber and offers different hardness levels with a tolerance of plus or minus 3-5A[1].

Pros:
– High-quality silicone rubber O-rings and high-temperature O-ring seals
– Custom-made O-rings available to meet specific customer needs
– Strict quality control and adherence to ISO 3601 standards
– Use of high-quality raw materials
– Options for using liquid silicone rubber
– Flexible hardness levels with a tolerance of plus or minus 3-5A
– Wide range of applications including engines, pumps, cylinders, connectors, and…

Cons:
– Importing from China may involve longer shipping times
– Quality inspection and testing may require additional time
– Custom orders may have varying production cycles depending on quantity and compl…

China O Rings Manufacturers and Suppliers

Xiamen Xlong Seal Co.,Ltd 厦门旭隆密封件有限公司

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

Product Details: Savvy Rubber manufactures a wide range of o-rings, including traditional standard o-rings, encapsulated o-rings, backup-rings, and x-rings. The o-rings are made from various materials such as NBR, FKM (Viton), Silicone, EPDM, HNBR, CR, and Aflas. NBR is the most commonly used material due to its good properties and low cost. FKM/Viton offers the best comprehensive performance and is widely used in high-standard sealing equipment. Silicone o-rings, especially FDA-grade silicone, are used in medical and food industries due to their non-toxic and high-temperature resistant properties. The hardness of o-rings is measured in Shore A, typically ranging from 40 to 90, with

60-70 being the most common. O-rings are available in various colors, and custom colors can be produced but may increase cost and delivery time.

Pros:
– High-quality materials with good sealing performance
– Wide range of materials available to suit different working conditions
– FDA-grade silicone options for medical and food industries
– High-temperature resistance up to 220°C for some materials
– Custom o-ring production with low mold/tooling cost and fast delivery
– Various hardness levels available to suit different applications
– Multiple manufacturing processes including compression molding, injection moldin…

Cons:
– Lower hardness o-rings can be prone to peeling, installation damage, extrusion,…
– Higher hardness o-rings can be inconvenient to install
– Custom colors may increase cost and require a larger minimum order quantity (MOQ…
– Silicone o-rings have low tensile strength and poor wear and tear strength, maki…

China O-Ring Kits Suppliers – NNK oil seal

Product Details: The Universal Type O-Ring Kit Box 30 size is a comprehensive assortment of O-rings made from commercial grade nitrile butadiene rubber (NBR) and fluoroelastomer (FKM) formulations. The kit includes 382-419 pieces depending on the type, with sizes available in both inches and millimeters. The O-rings are characterized by their oil, chemical, and high-pressure resistance, and they have a temperature range of -40 to 260°C. The hardness of the O-rings is between 60-90 Shore A. The kit is suitable for various applications including machines, excavators, cars, doors, windows, electric appliances, bearings, and pumps. The product is certified with ISO9001/TS16949 and meets

ASTM D 2000 standards.

Pros:
– High resistance to oils and chemicals
– Wide temperature range (-40 to 260°C)
– Suitable for both static and dynamic applications
– Durable and UV resistant
– Thick wall construction for maximum protection
– Meets high-quality standards (ISO9001/TS16949, ASTM D 2000)
– Versatile use in various industries and applications

Cons:
– Limited information on specific usage conditions that may require special materi…
– No mention of availability for extreme or specialized environments beyond genera…
– Potential need for backup rings in high-pressure environments, which may add com…

Custom HNBR O-Ring Manufacturer in China

Product Details: HNBR (Hydrogenated Nitrile Butadiene Rubber) O-rings are made by hydrogenating the double bonds in nitrile rubber, enhancing their heat, ozone, and chemical resistance. They are available in 70, 80, and 90 durometers and have a temperature range from -40°C to +150°C (-40°F to +302°F). HNBR O-rings are suitable for use with petroleum-based oils, fuels, aliphatic hydrocarbons, vegetable oils, silicone oils and greases, ethylene glycol, water, and steam up to 300°F, as well as diluted acids, bases, and salt solutions.

Pros:
– Excellent resistance to oils and chemicals
– Superior heat and ozone resistance
– Good low-temperature properties depending on Acrylonitrile (ACN) content
– Resistant to petroleum-based oils, fuels, and various other media
– Can be used in demanding applications such as automotive and industrial settings
– Cost-effective alternative to fluorocarbon rubber in some applications

Cons:
– Not suitable for use with chlorinated hydrocarbons, ketones, ethers, esters, and…
– Higher ACN content can result in inferior low-temperature properties
– Sulfur-curing reduces heat resistance and causes an inferior compression set

Viton O Ring Suppliers, Manufacturers, Factory

O Rings Manufacturer | O Rings Supplier – Hongjie Rubber Seal

Product Details: Hongjie is a professional O-rings manufacturer in China, offering custom O-rings wholesale services since 2000. They provide a one-stop O-rings OEM/ODM solution with custom options for design, color, packaging, and logo. The company adheres to various international O-Ring standards, and most sizes are already tooling, eliminating the need for additional investment. They use well-known raw material suppliers to guarantee product quality and have certified compounds to meet specific market requirements. Hongjie also has a certified laboratory to develop and identify match compounds per customer specifications or ASTM D200 callouts.

Pros:
– One-stop O-rings OEM/ODM solution
– Custom options for design, color, packaging, and logo
– Adherence to various international O-Ring standards
– Most sizes already tooling, no additional investment needed
– Use of well-known raw material suppliers
– Certified compounds to meet specific market requirements
– Certified laboratory for compound development and identification

Cons:
– No specific information on pricing or cost-effectiveness provided on the page
– No detailed information on the production process or quality control measures

High-quality O-ring Seals Manufacturer-Topa

Product Details: O-rings are round seals that create a mechanical seal between objects to prevent leakage of liquids and gases. They are used in various applications such as gas cylinders, pumps, connectors, and other appliances across industries like agriculture, industry, oil and gas, food, and construction. O-rings are made from different materials including polyurethane, neoprene, silicone, Buna-N, PTFE, etc., chosen based on factors like temperature, pH, humidity, pressure, and quality.

Pros:
– Stop foreign contaminants
– Maintain lubrication between objects
– Lighter in weight
– Easy to install and remove
– Resistant to abrasion
– Adaptable to extreme environments

Cons:
– Can leak due to incorrect installation, wrong size, excessive pressure, chemical…
– Material degradation over time depending on the material used (e.g., SBR, natura…

Xiamen Seals Technology Co.,Ltd: China O-Rings, X- …

Product Details: Xiamen Seals Technology Co., Ltd offers a wide range of O-rings and other sealing components. Their products include Buna-N Standard O-rings available in both standard and metric sizes, Spliced and Vulcanized O-rings made from materials like FKM (Viton), and Colored EPDM O-rings which are cost-effective and widely used. They also provide HNBR Rubber O-rings, IIR O-rings suitable for food and beverage applications, and various types of Silicone O-rings including those with FDA certification, cold resistance, and heat resistance. Custom OEM seals and gaskets, such as piston rod seals, are also available. The company has a complete production chain from R&D

to export and can customize products based on customer specifications and drawings.

Pros:
– Wide range of materials and sizes available, including standard AS-568, JIS, and…
– Custom design and manufacturing capabilities to meet specific customer needs.
– High-quality products suitable for various applications including automotive, me…
– FDA-certified options for use in food and beverage applications.
– Complete production chain from R&D to export ensures quality control and efficie…

Cons:
– Limited information on the specific durability and lifespan of each type of O-ri…
– No detailed pricing information available on the website.
– Dependence on customer-provided specifications and drawings for custom orders ma…

Comparison Table

Frequently Asked Questions (FAQs)

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

Chinese o-ring manufacturers often use a variety of materials, including Nitrile (NBR), Fluororubber (FKM or Viton), Silicone, Ethylene Propylene Diene Monomer (EPDM), and Hydrogenated Nitrile Butadiene Rubber (HNBR). Each material has its own unique properties and is suited for different applications, such as NBR for general-purpose use, FKM for high-temperature and chemical resistance, and Silicone for medical and food industries.

Can I customize the size and design of o-rings from Chinese manufacturers?

Yes, you can customize the size and design of o-rings from Chinese manufacturers. Many companies, such as Dongguan Hongju Silicone Rubber Products Co., Ltd. and Savvy Rubber, offer OEM and ODM services that allow you to provide your own design drawings or specifications. They can produce o-rings in various sizes, including both standard and metric sizes, and even offer custom colors and packaging options.

What are the typical minimum order quantities (MOQs) for o-rings from Chinese factories?

The minimum order quantities (MOQs) for o-rings can vary depending on the manufacturer. Some companies have relatively low MOQs, such as 10-100 pieces, while others may require larger orders, typically ranging from 500 to 50,000 pieces. It’s always a good idea to check with the specific manufacturer for their MOQ requirements.

Do Chinese o-ring manufacturers provide certifications and quality assurance?

Yes, many Chinese o-ring manufacturers provide certifications and ensure quality assurance. Companies like Shangrao Ruichen Sealing Co., Ltd. and Zhongshan Melon Rubber & Plastic Products Co., Ltd. hold certifications such as ISO 9001, ISO 14001, IATF16949, and ISO 13485. These certifications indicate that the products meet international quality and safety standards.

Can I get free samples or after-sales service from Chinese o-ring manufacturers?

Yes, many Chinese o-ring manufacturers offer free samples and after-sales service. For example, Dongguan Hongju Silicone Rubber Products Co., Ltd. provides free samples for testing, and Xiamen Flying Silicone Rubber Co., Ltd. offers after-sales service to assist customers with any issues they may encounter. This ensures that you can test the quality of the o-rings before placing a large order and receive support if needed.