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, materials, and services to help you make an informed decision. Let’s dive in

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 for various applications, including engines, pumps, cylinders, connectors, and valves. They offer both standard and custom-made O-rings, with the ability to meet specific requirements. The O-rings are designed to have strong resistance to water, oil, and high temperatures. The manufacturing process includes design, tool making, color mixing, compression molding, quality inspection, and packaging. Hongju follows ISO 3601 standards for dimensions and tolerances and can use different materials such as liquid silicone rubber. They also provide OEM and ODM services and ensure compliance with international safety standards like CE, SGS, REACH,

and ROHS Directive requirements.

Pros:
– High-quality silicone rubber O-rings with strong resistance to water, oil, and h…
– Custom-made O-rings available to meet specific customer needs.
– Strict quality control and compliance with international safety standards.
– Wide range of applications including engines, pumps, cylinders, connectors, and…
– Advanced equipment and ISO 9001: 2008 quality management systems.
– Low minimum order quantity (MOQ) and rapid prototyping capabilities.

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

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 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, NBR, Silicone)
– Low cost (especially NBR)
– Wide range of materials and sizes available
– Custom o-rings can be made at low mold/tooling cost
– Fast delivery options

Cons:
– Low hardness o-rings are prone to peeling, installation damage, extrusion, and p…
– High hardness o-rings can be inconvenient to install
– Specific materials have limitations (e.g., NBR not suitable for high temperature…

Perfluoroelastomer FFKM O ring Manufacturer

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 popular sizes, either in inches or 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 popular sizes) for various applications
– Durable and long-lasting with thick wall construction
– UV resistant and suitable for use with liquids such as oil
– Certified with ISO9001/TS16949 standards ensuring high quality
– Practical resealable plastic case for easy storage

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

Viton O Ring Suppliers, Manufacturers, Factory

Custom FEP O-ring Manufacturer in China

Product Details: YOSON FEP O-rings are produced from fluorocarbon or silicone with seamless FEP jackets. They are certified to ISO 3601, BS 4528, and AS 568 standards and are available in both inch and metric sizes. These O-rings are known for their high corrosion resistance, low friction, and elastic properties, making them suitable for various industry applications such as automotive, industrial, medical, and agricultural sectors. They offer excellent temperature resistance, with a range from -60°C to +260°C, and are made from FDA, USP Class VI compliant, and Sanitary 3A materials. Custom designs are available to maximize sealing performance.

Pros:
– High corrosion resistance
– Low friction and elastic properties
– Excellent temperature resistance (-60°C to +260°C)
– Chemical resistance and mechanical properties of Teflon FEP and PFE polymer
– FDA, USP Class VI compliant, and Sanitary 3A materials
– Available in various colors and custom designs
– Suitable for a wide range of industry applications including food, beverages, an…

Cons:
– The fluoropolymer jacket’s slight stiffness can require custom application desig…
– Installation errors or defective design of the installation space can lead to se…

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 available in various materials such as polyurethane, neoprene, silicone, Buna-N, PTFE, etc., and are used in diverse industries including agriculture, industry, oil and gas, food, and construction. O-rings can be placed in gas cylinders, pumps, connectors, and other appliances to form a tight seal.

Pros:
– Can stop foreign contaminants and maintain lubrication between objects.
– Lighter in weight, easy to install and remove.
– Resistant to abrasion and can be adapted to extreme environments.
– Reduce the possibility of leaks and minimize damage to threads.
– Can tolerate pressure and high temperatures, and are easily replaced and repaire…

Cons:
– Can leak due to incorrect installation, wrong size, excessive pressure, chemical…
– If the O-ring is dropped or installed improperly, it can cause damage.
– There is a limit to the temperature range; exceeding this range can cause the O-…

O Rings Manufacturer | O Rings Supplier – Hongjie Rubber Seal

Product Details: Hongjie Sealing Technology offers a wide range of O-ring products, including custom O-rings, rubber O-rings, and silicone O-rings. They provide one-stop O rings OEM/ODM solutions with options for custom 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 certificated compounds to meet specific market requirements. Their laboratory is equipped to develop and identify compounds per customer specifications or ASTM D200 callouts.

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

Cons:
– No specific cons mentioned on the website

Comparison Table

Frequently Asked Questions (FAQs)

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

Chinese O-ring factories often use a variety of materials, each with its own unique properties. The most common materials include Nitrile Rubber (NBR), Fluorinated Rubber (FKM or Viton), Ethylene Propylene Diene Monomer (EPDM), Hydrogenated Nitrile Butadiene Rubber (HNBR), and Silicone. Each material is chosen based on its compatibility with different chemicals and its performance under various conditions.

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 factories, such as Dongguan Hongju Silicone Rubber Products Co., Ltd. and Savvy Rubber, offer OEM and ODM services that allow you to provide your own specifications and design drawings. They can produce O-rings in both standard and custom sizes, as well as different shapes like encapsulated O-rings, backup-rings, and X-rings.

What are the typical minimum order quantities (MOQs) for O-ring orders in China?

The minimum order quantities (MOQs) for O-ring orders in China 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 5,000 pieces. It’s always a good idea to check with the specific manufacturer to understand their MOQ requirements.

Do Chinese O-ring manufacturers provide certifications and ensure quality standards?

Yes, many Chinese O-ring manufacturers adhere to international quality standards and provide necessary certifications. 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 ensure that the products meet specific quality and safety standards.

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

Yes, several 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 larger order and receive support if needed.