Are you curious about the top paper manufacturing factories in China? Let’s dive into the world of paper production and explore some of the leading factories that are making a significant impact in the industry. From tissue paper to packaging materials, these manufacturers are setting the standard for quality and innovation. Here’s a look at some of the best.

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 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 and advanced equipment
– Options for different materials and hardness levels
– Wide range of applications including engines, pumps, and valves
– Low minimum order quantity (MOQ) and rapid prototyping available[1][3]

Cons:
– Importing from China may involve longer shipping times
– Quality inspection and production cycle can take 9-15 workdays depending on the…

Xiamen Xlong Seal Co.,Ltd 厦门旭隆密封件有限公司

Custom HNBR O-Ring Manufacturer in China

Product Details: HNBR (Hydrogenated Nitrile Butadiene Rubber) O-rings are synthesized by hydrogenating the double bonds in nitrile butadiene rubber, enhancing its heat, ozone, and chemical resistance. They are available in 70, 80, and 90 durometers and have a temperature range from -30°C to +150°C (-20°F to +302°F). HNBR O-rings are suitable for use with petroleum-based oils and 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. The acrylonitrile content can vary from 17% to 49%, affecting low-temperature properties and resistance to fuels and polar lubricants[1][2][4].

Pros:
– Superior heat, ozone, and chemical resistance
– Wide temperature range (-30°C to +150°C or -20°F to +302°F)
– Excellent resistance to petroleum-based oils and fuels, aliphatic hydrocarbons,…
– Good performance in water and steam up to 300°F
– Resistant to diluted acids, bases, and salt solutions
– Enhanced durability and abrasion resistance
– Cost-effective compared to fluorocarbon rubber in some applications

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

FKM O Rings, China NBR O Ring supplier

China O-Ring Kits Suppliers – NNK Oil Seal

Product Details: NNK O-Ring kits are supplied in various standard and customizable sizes, made from materials such as Nitrile (NBR), Fluorine rubber (FKM, FPM, VITON), Silicone (SIL, VMQ), EPDM, Hydrogenated Nitrile (HNBR), and Fluorosilicone (FVMQ). These O-Rings are machine tested to ensure no burrs, no damage, and guaranteed elasticity. They are designed for both static and dynamic sealing and can be used in a wide range of applications including machine tools, automobiles, aerospace equipment, and construction machinery. The kits are ideal for maintenance applications, reducing the guesswork in part selection and saving time in part sorting.

Pros:
– High performance and customized O-Rings available
– Machine tested to ensure quality and elasticity
– Suitable for various applications including machinery, automobiles, and aerospac…
– Reduces maintenance and assembly personnel costs
– Simple sealing groove structure and compact installation
– Self-sealing effect, strong sealing, and low frictional resistance

Cons:
– No specific cons mentioned, but proper material selection and usage conditions m…
– Requires correct groove design and material selection to ensure long-term sealin…

China, O-Rings & McMaster

Product Details: The discussion revolves around O-rings sourced from China and sold through various suppliers, including McMaster. The O-rings in question are often made from materials like Nitrile, Viton, and other elastomers. The sizes mentioned include standard and metric sizes, with specific examples like the 2-206 O-ring. The prices are notably low, such as $.044 per O-ring from McMaster, which raises concerns about quality and manufacturing origin.

Pros:
– Inexpensive: The O-rings are very cheap, with prices as low as $.044 each.
– Wide availability: O-rings are readily available from multiple suppliers, includ…
– Automated manufacturing: The process is largely automated, which should theoreti…

Cons:
– Quality issues: There have been reports of defects, such as small tears, which c…
– Variable quality control: Despite automation, the quality of O-rings from Chines…
– Dependence on foreign manufacturing: Many US and European suppliers source their…

China O Rings Manufacturers and Suppliers

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

O Rings Manufacturer | O Rings Supplier – Hongjie Rubber Seal

Product Details: Hongjie Sealing Technology offers a one-stop O rings OEM/ODM solution. They provide custom O-rings with 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. Their laboratory is certified to develop and identify 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, reducing additional investment
– 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
– No details on minimum order quantities (MOQ) or lead times

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% after 70 hours at

204 °C[1].

Pros:
– Highest temperature resistance among rubber O-ring and gasket materials, up to 6…
– Excellent chemical resistance to a wide range of aggressive chemicals, including…
– High thermal, oxidative, and chemical stability due to carbon-fluorine bonds[3] – Long service life and reliability in dynamic and static applications[3] – Low off-gassing and extractable levels, making them suitable for clean and sensi…

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

Comparison Table

Frequently Asked Questions (FAQs)

Frequently Asked Questions About O-Ring Manufacturing Factories in China

What types of materials are commonly used by O-ring manufacturers in China?

O-ring manufacturers in China use a variety of materials, including Nitrile (NBR), Ethylene Propylene Diene Monomer (EPDM), Fluororubber (FKM), Hydrogenated Nitrile Butadiene Rubber (HNBR), and silicone. Each material has its own unique properties and is suited for different applications, such as chemical, acid, temperature, and oil resistance.

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, like Dongguan Hongju Silicone Rubber Products Co., Ltd. and Savvy Rubber, offer OEM & ODM services that allow you to specify your own designs, sizes, and materials. They can produce both standard and custom O-rings according to your specifications.

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 for their MOQ policies.

Do Chinese O-ring manufacturers provide certifications and meet international standards?

Yes, many Chinese O-ring manufacturers provide certifications and meet international standards. Companies like Shangrao Ruichen Sealing Co., Ltd. and Xingtai Baifu Seal Co., Ltd. hold certifications such as ISO 9001, ISO 14001, IATF16949, and ISO 13485, ensuring their products meet high quality and safety standards.

Can I get free samples from Chinese O-ring manufacturers for testing?

Yes, some Chinese O-ring manufacturers offer free samples for testing. For example, Dongguan Hongju Silicone Rubber Products Co., Ltd. provides free samples to potential customers, allowing you to test the quality and suitability of their O-rings before placing a larger order. This can be a great way to ensure the product meets your needs.