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NBR O-rings are made from Nitrile Butadiene Rubber (NBR), a synthetic elastomer derived from the copolymerization of acrylonitrile (ACN) and butadiene. The key classification of NBR is based on acrylonitrile content, which directly impacts its performance:
Low ACN (18–25%): Offers excellent flexibility and low-temperature resistance, suitable for dynamic sealing.
Medium ACN (31–35%): Balances oil resistance, flexibility, and mechanical strength, the most widely used type.
High ACN (36–42%): Provides superior oil, fuel, and chemical resistance, ideal for harsh industrial environments.
NBR is cost-effective and compatible with most petroleum-based fluids, making it a staple in industrial sealing applications.
BASIC INFORMATION
Parameter | Low ACN NBR | Medium ACN NBR | High ACN NBR |
Acrylonitrile Content | 18–25% | 31–35% | 36–42% |
Temperature Range | -40°C to 100°C (-40°F to 212°F) | -35°C to 120°C (-31°F to 248°F) | -30°C to 150°C (-22°F to 302°F) |
Hardness (Shore A) | 50–70 | 60–80 | 70–90 |
Tensile Strength | ≥15 MPa (2176 PSI) | ≥18 MPa (2611 PSI) | ≥20 MPa (2901 PSI) |
Elongation at Break | ≥400% | ≥350% | ≥300% |
Compression Set (70hrs @ 100°C) | ≤30% | ≤25% | ≤20% |
Oil Resistance (70hrs @ 100°C, volume change) | ≤15% | ≤10% | ≤8% |
Key Advantages | Flexible, low-temperature resistance | Balanced oil resistance & flexibility | Superior oil/fuel resistance |
Key Performance Characteristics
Oil & Fuel Resistance:
Exceptional resistance to petroleum oils, mineral oils, gasoline, diesel, and most hydrocarbon-based fluids.
Not recommended for use with polar solvents (e.g., acetone, methanol) or strong acids.
Temperature Range:
Typical operating range: -40°C (-40°F) to 120°C (248°F).
Special high-acrylonitrile grades can withstand up to 150°C (302°F) for short periods.
Mechanical Strength:
Good tensile strength and abrasion resistance, ensuring durability in dynamic sealing applications (e.g., rotating shafts).
Moderate compression set—performs well in static sealing but requires proper design for long-term dynamic use.
Cost-Effectiveness:
More affordable than specialty elastomers (e.g., FKM, VMQ), making it a cost-efficient choice for general industrial sealing.
Applications
Automotive Industry:
Seals for engine oil pans, fuel injectors, transmission systems, and hydraulic hoses (resistant to engine oils and fuels).
Industrial Machinery:
Static and dynamic seals for hydraulic cylinders, pumps, valves, and gearboxes (handles mineral-based hydraulic fluids).
Appliances:
Seals for washing machine water inlets, dishwasher pumps, and refrigerator compressors (resistant to water and mild detergents).
Oil & Gas Sector:
Seals for pipelines, storage tanks, and low-pressure equipment handling crude oil or refined hydrocarbons.
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