NBR O-RING Seal
Summary：
rubber seals manufacturer, O-rings supplier, custom rubber seals, silicone O-rings, NBR seals, Viton O-rings, hydraulic seals, rubber gasket, China seal factory,More information please contact me :sales1@fuste.com.cn
In the world of industrial sealing, few components are as ubiquitous or as trusted as the O-Ring. Among the myriad of elastomers available, NBR (Nitrile Butadiene Rubber) —commonly known as Nitrile—stands out as the default choice for a vast range of applications. From automotive engines to hydraulic systems, the NBR O-Ring is often referred to as the "workhorse" of the sealing industry due to its excellent balance of performance, durability, and cost-effectiveness.
Key Properties & Performance
The popularity of NBR O-Rings is attributed to their unique set of physical properties:
Superior Oil & Fuel Resistance: This is the hallmark of NBR. It exhibits excellent resistance to mineral oils, diesel fuels, gasoline, hydraulic fluids, and animal/vegetable fats.
Wide Temperature Range: Standard NBR O-Rings operate effectively between -35°C to +120°C (-31°F to 248°F). Special low-temperature grades can reach as low as -55°C.
High Tensile Strength & Abrasion Resistance: NBR is tough. It resists tearing and wear, making it suitable for dynamic applications (moving parts like pistons and rods).
Low Compression Set: NBR holds its shape well after compression, ensuring a long-lasting seal without permanent deformation.
Cost-Effective: Compared to FKM (Viton®) or EPDM, NBR offers exceptional performance for a fraction of the cost.
Common Applications
You will find NBR O-Rings in virtually every industry that relies on petroleum-based fluids:
Automotive: Fuel systems (injectors, pumps), engine gaskets, power steering hoses, air conditioning systems, and brake systems (with specific formulations for brake fluids).
Hydraulics & Pneumatics: Cylinder seals, valves, pumps, and high-pressure connectors.
Oil & Gas: Downhole tools, blowout preventers, and refinery equipment where crude oil contact is standard.
Industrial Manufacturing: Bearings, compressors, and heavy machinery requiring dirt and oil exclusion.
Compatibility: What NBR Can and Cannot Touch
To avoid costly failures, it is critical to know where NBR excels and where it fails.
✅ Resistant to:
Mineral oils & greases
Diesel and gasoline (up to certain ethanol blends)
Hydraulic oils (ASTM Oil No.1, No.3)
Animal & vegetable oils
❌ Not recommended for (Will cause swelling or degradation):
Brake Fluids (DOT glycol-based)
Ozone, UV light, or Weathering (NBR degrades outdoors unless blended with PVC)
SKYDROL® (phosphate ester hydraulic fluids used in aviation)
Chlorinated Hydrocarbons (e.g., trichloroethylene)
Automotive AC systems using R134a/R1234yf (Typically requires HNBR)
Special Variants: HNBR
For engineers facing higher temperatures and aggressive environments, HNBR (Hydrogenated NBR) is the natural upgrade. By subjecting NBR to hydrogenation, the remaining double bonds are saturated. This results in a material that:
Handles temperatures up to 150°C (302°F) .
Offers significantly better ozone, chemical, and heat resistance.
Lasts much longer in modern automotive engine environments (timing belts, AC systems).
Conclusion
The NBR O-Ring is a masterpiece of material science and practicality. While it is not a universal solution (avoid ozone and brake fluid), it remains the gold standard for sealing petroleum-based fluids in standard temperature ranges.
When designing a system involving oil, fuel, or grease, the NBR O-Ring is not just a choice—it is often the smartest choice, offering reliability without the premium price tag of specialty elastomers. Always verify the ACN content and temperature requirements with your supplier to ensure optimal performance.
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Xiamen Fuste Rubber & Plastic Co., Ltd
Add1：No.96 Jinyuan East Road,Xingling,Jimei District,Xiamen City,Fujian Province,China
Xiamen Fuste Automotive Parts Co., Ltd
Add2：No. 7-2 Dongliao Road, Xinxu Town, Xiang'an District, Xiamen City,Fujian Province,China
Xiamen Fuste lmport and Export Co., Ltd
Add 3：Room 1909, No. 22-1, Xingqian Road, Jimei District, Xiamen City,Fujian Province,China
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