NBR Ball | Nitrile Rubber Ball | Buna-N Ball | 5mm to 310mm | Outstanding Oil and Fuel Resistance
HEMSUN ENGG. INDUSTRIES manufactures NBR Balls — Nitrile Rubber Balls, also known as Buna-N Balls — from 5mm to 310mm diameter. NBR is the world's most widely used rubber for oil, fuel, and hydraulic fluid service — NBR Balls are the standard ball element in virtually all hydraulic system check valves, oil pump check valves, fuel system check valves, and lubrication system pump check valves globally. Available in Shore A hardness from 40 to 90 and acrylonitrile content from 18% to 50% for different oil resistance and flexibility requirements. ISO 3290 Grade G10. Exported globally.
Applications
Hydraulic systems
NBR Balls the universal standard for hydraulic pump and cylinder check valves globally
Oil and gas
NBR Balls in oil pump check valves, wellhead equipment, and chemical injection pump check valves
Fuel systems
NBR Balls in fuel pump check valves, fuel injector check balls, gasoline and diesel service
Lubrication systems
NBR Balls in centralized lubrication pump check valves and oil metering valves
Automotive
NBR Balls in hydraulic brake check valves, power steering check valves, and transmission fluid control
Large oil service valves
150mm to 310mm NBR Balls for large-bore hydraulic and oil system check valves
Features
Diameter
5mm to 310mm — industry-leading NBR Ball size range
Material
NBR (Nitrile Butadiene Rubber / Buna-N)
Grade
ISO 3290 Grade G10 precision
Oil Resistance
outstanding oil, fuel and petroleum resistance
Hydraulic Fluid Resistance
excellent
Grease Resistance
good resistance to greases and mineral oils
Temperature range
-40°C to +120°C
Wide hardness range
Shore A 40 to 90
Acrylonitrile content
18% to 50% (standard 33–40%)
Strength
good mechanical strength and abrasion resistance
Market Position
world standard for oil and hydraulic service
IEC registered
export-ready quality
Technical Specifications
| Property | Value |
|---|---|
| Material | NBR (Nitrile Butadiene Rubber / Buna-N) |
| Diameter Range | 5mm – 310mm |
| Grade | ISO 3290 Grade G10 |
| Temperature Range | -40°C to +120°C |
| Oil Resistance | Outstanding — petroleum, hydraulic fluid, fuel |
| Shore A Hardness | 40 – 90 (specify requirement) |
| Acrylonitrile Content | 18% to 50% (standard 33–40%) |
| Color | Black |
| Ozone Resistance | Poor — not for outdoor service |
| Export Markets | UAE, Germany, USA, Japan, Singapore, Brazil, Turkey, Middle East |
Manufacturing Process
NBR Balls are compression-molded from NBR rubber compound then precision-ground to dimensional tolerances. Acrylonitrile content (18%–50%) selected by application: higher content = better oil resistance; lower content = better flexibility at low temperature.
Compliance & Standards
IEC registered. ISO 3290 Grade G10. Shore A hardness 40–90 available — specify requirement. Acrylonitrile content (NBR grade) specified for oil resistance level. Not suitable for water, ozone, or outdoor service — use EPDM or Neoprene Balls. Regular export to UAE, Germany, USA, Japan, Singapore, Brazil, Turkey, and Middle East.
Frequently Asked Questions
What is the largest NBR Ball you manufacture?
We manufacture NBR (Nitrile Rubber) Balls up to 310mm diameter — one of the widest size ranges globally. Large NBR Balls (150mm to 310mm) serve large-bore hydraulic and oil system check valves in industrial and oil and gas applications.
What acrylonitrile content NBR should I specify for my application?
Higher acrylonitrile content (40–50%) gives better oil resistance but lower flexibility at low temperatures. Standard medium NBR (33–40% acrylonitrile) balances oil resistance and low-temperature flexibility for most hydraulic and oil pump check valve applications. Low acrylonitrile (18–25%) gives maximum flexibility at low temperatures but reduced oil resistance.
Can NBR Balls be used in fuel service?
Yes. NBR Balls have excellent resistance to petroleum fuels — gasoline, diesel, and kerosene. They are the standard rubber ball in fuel pump check valves and fuel transfer system check valves in automotive, aviation ground support, and fuel storage applications.
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