Are you looking for the best Buna (NBR) O-ring manufacturers in China? With so many options available, it can be overwhelming to choose the right one. In this article, we’ll compare the top Buna 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.

Buna-n O-ring Manufacturers and Suppliers China

Product Details: NBR (Nitrile rubber) O-rings are made from acrylonitrile-butadiene polymer. They have an inside diameter of up to 2000mm and a cross-section of up to 40mm. The material is available in various hardness levels, typically between 60-90 Shore A. These O-rings operate within a temperature range of -30°C to +120°C. They are compatible with mineral oils, greases, and hydraulic oils but have poor resistance to ozone and UV rays. The O-rings are standardized according to DIN 3771, ISO 3601, and other international standards.

Pros:
– Can be used in both hydraulic and pneumatic systems
– Suitable for static and low-pressure dynamic applications
– Wide range of dimensions available
– Easy installation and removal
– Economical sealing solutions
– Good chemical resistance to mineral oils and greases
– Available in food-grade quality with special approvals like EU 1935/2004, FDA, N…

Cons:
– Not recommended for rotary movements
– Poor resistance to ozone and UV rays, making them unsuitable for outdoor use
– Limited high-temperature resistance compared to other materials like FKM

NBR O-Rings, Buna-N / Nitrile O-Rings – China Manufacturer

Product Details: NBR O-Rings, also known as Nitrile O-Rings, Buna-N O-Rings, or Perbunan O-Rings, are made by the copolymerization of acrylonitrile and butadiene. The acrylonitrile content varies from 18% to 50%. These o-rings have a temperature range of -40°C to 120°C (-40°F to 248°F) and a durometer hardness range of Shore A 40-90, with a standard hardness of Shore A 70. They are available in various colors, with black being the standard, and come in round, square, rectangular, and custom shapes. The shelf life is 5-10 years, and they are widely used due to their low price and good performance[3].

Pros:
– Excellent resistance to petroleum products and hydrocarbon fuels
– Good mechanical properties, including high wear resistance and good abrasion res…
– Compatibility with fuel, oil, gasoline, solvent, and various fluid media such as…
– Low cost and widely available
– Good compression set, tear, and abrasion resistance

Cons:
– Not suitable for use in polar solvents such as ketones, ozone, nitrobenzene, and…
– Decreased low-temperature flexibility and increased brittleness with higher acry…
– Poor resistance to ozone, sunlight, and weather
– Should not be stored near electric motors or other ozone-generating equipment

Buna-N O-Rings (NBR) Nitrile

Buna-N 70 Shore A Rubber O-Rings

Product Details: The website discusses various types of O-rings, including NBR (Nitrile), FKM/FPM (Viton), PTFE, Neoprene, EPDM, and MVQ (Silicone). For NBR O-rings, the temperature range is -40°C to 120°C (-40°F to 248°F), and they have good wear resistance but are not suitable for brake fluid, ketones, or some hydraulic fluids. FKM/FPM (Viton) O-rings operate from -25°C to 204°C (-13°F to 399°F) and are resistant to high temperatures, oils, solvents, and chemicals. The website also mentions custom designs and various materials available for different industrial applications.

Pros:
– NBR O-rings have good wear resistance and are suitable for oils.
– FKM/FPM (Viton) O-rings offer excellent resistance to high temperatures, oils, s…
– Custom designs and various materials are available to cater to specific industri…
– Broadly differentiated O-ring assortment in all prevalent international dimensio…

Cons:
– NBR O-rings are not resistant to brake fluid, ketones, or some hydraulic fluids.
– NBR O-rings do not resist weathering, sunlight, and ozone unless a special compo…
– FKM/FPM (Viton) O-rings may not be suitable for applications involving brake flu…

Buna-N O-ring

Product Details: Sealsmart Rubber Co., Ltd. is a professional manufacturer of rubber seals, including O-rings, X-rings, rubber washers, oil seals, V-rings, Viton rubber cords, and customized rubber seals. They serve various industries such as ships, machinery, petroleum, chemical, nuclear, and aerospace. The company has strong R&D and manufacturing capabilities, offering both standard and customized products.

Pros:
– Strong research and development capabilities
– Wide range of products including O-rings, X-rings, and customized seals
– Serves multiple industries with specialized sealing solutions
– Ability to provide OEM services and customized products
– High-quality products trusted by well-known manufacturers

Cons:
– Limited information available on specific product performance metrics
– No detailed customer reviews or feedback available on the website

hydraulic rubber nitrile Buna-N NBR o ring … – DMS Seals

Product Details: The hydraulic rubber nitrile Buna-N NBR O-rings are made from Nitrile Butadiene Rubber (NBR) and are available in hardness levels of 70 and 90 Shore A. These O-rings are black in color and come in various sizes, including P, G, AS568, and custom sizes. They are used for static sealing and can be applied in dynamic conditions under better circumstances. The operating temperature range is -30°C to +100°C, and they can handle pressures up to 5 MPa. The O-rings are suitable for use with hydraulic oil, fire retardant liquids, water, and other media. They are commonly used in applications such

as excavators, loaders, graders, and other heavy machinery[1][2][5].

Pros:
– High sealing efficiency due to the deformation of the O-ring section under press…
– Wide range of applications including static and dynamic sealing
– Compatible with various media such as hydraulic oil, fire retardant liquids, and…
– Available in different sizes and hardness levels to suit various requirements
– Passed ISO 9001:2008 and TS 16949:2009 quality certifications

Cons:
– Not recommended for rotary motion without sufficient lubrication
– Limited speed capability, up to 2 m/s
– May not perform optimally in conditions with insufficient system lubrication

Buna-N Nitrile O Ring Gasket Cord

Product Details: Buna-N (Nitrile) O-Rings are made from a synthetic rubber material known as acrylonitrile-butadiene. They are available in standard durometers of 70 and 90, but can be produced in other hardness levels as well. The temperature range for these O-Rings is typically -40°F to 250°F (-40°C to 121°C). They are commonly used in applications involving petroleum-based oils, fuels, silicone greases, and water. Standard colors include black, with custom colors available upon request.

Pros:
– Excellent resistance to oils, fuels, and other chemicals.
– Good wear resistance and compression set resistance.
– High tensile strength (≥10 N/mm²) and elongation at break (roughly 300%).
– Cost-effective and durable.
– Less likely to cause allergic reactions compared to latex or natural rubber.
– Good short-term resilience and permeation resistance.

Cons:
– Not recommended for use with brake fluids, acetones, ketones, halogenated hydroc…
– Poor resistance to ozone, weathering, and sunlight.
– Not suitable for applications requiring resistance to aromatic hydrocarbons, chl…
– May harden with high temperatures if sulfur-cured.

buna o rings – Quality Supplier from China

china manufacture black NBR 70 rubber o-ring with high …

Product Details: The Black NBR 70 Shore O-Ring is made from NBR (Nitrile Butadiene Rubber) material. It is designed for hydraulic and pneumatic sealing applications. The O-ring has a hardness of 70 Shore A and is available in standard and customized sizes. It operates effectively in temperatures ranging from -30°C to 100°C and can handle pressures up to 60 MPa. The O-ring is suitable for various mediums including hydraulic oil, anti-fire fluid, water, and gas. It is commonly used in equipment such as excavators, loaders, graders, dump trucks, and other heavy machinery.

Pros:
– High sealing performance due to large surface tension under pressure.
– Suitable for both static and dynamic applications, though better suited for stat…
– Inexpensive, easy to make, and reliable with simple mounting requirements.
– Can handle high and low temperatures, high and low pressures, and has friction r…

Cons:
– Not recommended for dynamic applications with insufficient lubrication during ro…
– Service life is determined by system lubrication, pressure, temperature, sealing…

Nitrile(Buna-N) O-RING

Comparison Table

Frequently Asked Questions (FAQs)

Frequently Asked Questions About Buna O-Ring Factories in China

What materials are commonly used to make Buna-N (NBR) O-Rings in Chinese factories?

Chinese factories typically use a copolymer of acrylonitrile and butadiene to make Buna-N (NBR) O-Rings. The acrylonitrile content can vary from 18% to 50%, which affects the O-Ring’s resistance to petrochemicals and low-temperature performance.

What are the typical applications of Buna-N O-Rings produced in China?

Buna-N O-Rings are widely used in various industries, including automotive, aerospace, and hydraulic systems. They are often used in fuel tanks, lubricating oil tanks, and in fluid media such as petroleum hydraulic oil, gasoline, and silicone oil.

How do Chinese manufacturers ensure the quality of their Buna-N O-Rings?

Chinese manufacturers like Jiangyin No.3 Rubber Manufacturer Co., Ltd. and DMS Seals Technology Co., Ltd. ensure high-quality products through rigorous quality control measures. This includes experienced staff conducting thorough checks and tests on each piece of rubber product before shipping.

Can I customize the Buna-N O-Rings according to my specific needs?

Yes, you can customize Buna-N O-Rings according to your specifications. Many Chinese manufacturers, such as Xiamen Lindas Hardware Industrial Co., Ltd. and SWKS Seal, offer customized services where they can produce O-Rings based on your designs and drawings.

What is the typical temperature range and shelf life of Buna-N O-Rings produced in China?

Buna-N O-Rings generally have a temperature range of -40°C to 120°C (-40°F to 248°F). They typically have a shelf life of 5 to 10 years, depending on storage conditions. This makes them reliable for a wide range of applications over an extended period.