Are you looking for the best o-ring and gasket factories in China? If so, you’re in the right place. In this article, we’ll compare the top manufacturers, highlighting their unique strengths, product ranges, and what sets them apart in the industry. Let’s dive in and find the perfect fit for your needs.

FKM O Rings, China NBR O Ring supplier

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, adhering to ISO 3601 standards for dimensions and tolerances. The manufacturing process includes design, tool making, color mixing, compression molding, and quality inspection. The company uses high-quality raw materials and advanced equipment to ensure product reliability and compliance with international safety standards like CE, SGS, REACH, and ROHS Directive requirements.

Pros:
– High-quality silicone rubber O-rings and high-temperature O-ring seals
– Custom-made O-rings available to meet specific requirements
– Compliance with ISO 3601 standards and international safety standards
– Advanced equipment and strict quality control
– Wide range of applications including engines, pumps, and valves
– Low MOQ and rapid prototyping options
– Environmentally friendly materials and processes

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

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 beyond the 30 included
– May require additional backup rings for elevated operating pressure environments

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 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 and shapes.

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
– Customizable colors and shapes
– Easy installation and 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
– Material-specific limitations (e.g., NBR not suitable for high temperatures, FKM…

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 options including 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 certified to develop and identify match compounds per customer specifications or ASTM D200 callouts.

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

Cons:
– No specific information on pricing or cost-effectiveness provided
– No details on minimum order quantities (MOQ)
– No information on delivery times or shipping logistics

China PTFE O-Ring Supplier

Product Details: PTFE O-rings are made from polytetrafluoroethylene, a fluoropolymer known for its high chemical resistance, low friction coefficient, and wide temperature range. They are typically white, non-porous, and FDA compliant. PTFE O-rings can operate continuously from -200°C to 260°C and exhibit excellent thermal and electrical insulation properties. They are often used in chemical processing, pharmaceutical, food, and laboratory environments due to their inertness and resistance to acids, bases, solvents, and oils.

Pros:
– Excellent chemical resistance against a wide range of chemicals, including acids…
– Low friction coefficient, allowing for easy movement and minimal wear.
– Wide temperature range of -200°C to 260°C without losing mechanical properties.
– Non-porous, making them easy to clean and sterilize.
– High heat resistance and thermal insulation properties.
– Suitable for use in the food and pharmaceutical industries due to their non-toxi…

Cons:
– Mechanical properties are lower compared to other plastics, though they remain u…
– Higher tendency to creep and deform under constant pressure, which can lead to s…
– Require more precise machining and installation due to their rigidity and brittl…
– Not recommended for use in situations where a soft, conforming seal is required.
– Lack of elastic recovery, which can rule out their use for dynamic seals.

Viton O Ring Suppliers, Manufacturers, Factory

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 come in a wide range of temperatures (-75°F to 450°F or -60°C to 232°C), hardness levels (30 to 80 durometer Shore A), and colors.

Pros:
– Excellent heat, ozone, and corona resistance
– Good dielectric stability and resistance to many oils, chemicals, and solvents
– Retains flexibility at low temperatures
– Non-toxic and biocompatible, suitable for medical and food applications
– Excellent electrical insulation and resistance to UV light, water, oxygen, and m…
– Can be formulated to meet specific requirements such as color, temperature range…

Cons:
– Low tensile strength and 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 durometers

Comparison Table

Frequently Asked Questions (FAQs)

Frequently Asked Questions About O-Ring and Gasket Factories in China

What types of materials are commonly used by o-ring and gasket factories in China?

O-ring and gasket factories in China use a variety of materials, including nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), ethylene propylene diene monomer (EPDM), fluoroelastomer (FKM), and silicone. Each material has its own unique properties and is suited for different applications, such as chemical resistance, high-temperature tolerance, or food-grade requirements.

What is the typical lead time for ordering o-rings and gaskets from Chinese manufacturers?

The lead time can vary depending on the manufacturer and the time of year. Generally, peak season lead times can be within 15 workdays, while off-season lead times might take around a month. Some manufacturers also offer expedited services for prototypes or urgent orders.

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

Yes, you can customize o-rings and gaskets to fit your specific requirements. Many Chinese manufacturers offer one-stop OEM/ODM solutions, allowing you to design, choose colors, and even add your logo. They can produce custom sizes, shapes, and materials based on your specifications and drawings.

What certifications and quality standards do Chinese o-ring and gasket manufacturers adhere to?

Chinese o-ring and gasket manufacturers often adhere to international quality standards such as ISO 9001, ISO 14001, IATF16949, and ISO 13485. These certifications ensure that the products meet high-quality and safety standards, making them suitable for various industries, including automotive, aerospace, and medical equipment.

How do I ensure the quality of o-rings and gaskets before making a purchase?

To ensure quality, look for manufacturers with quality assurance certifications like ISO 9001. Many factories also have in-house testing facilities and experienced quality control teams that check each product before shipping. Additionally, you can ask for samples or consult with their sales team to get more information about their quality control processes.