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NBR
Material Type
Rubber
Material Full Name
Nitrile Butadiene Rubber
Process Compatibility
Injection Molding, Compression Molding
Basic Properties
Property |
Parameter/Performance |
Remarks |
|---|---|---|
| Chemical Name | Nitrile Butadiene Rubber | Copolymer of butadiene and acrylonitrile (ACN content: 18%-50%) |
| Molecular Structure | Non-crystalline elastomer | Polar rubber (-CN groups), excellent oil resistance |
| Density | 0.95~1.05 g/cm³ | Increases with ACN content |
| Color | Light yellow to brown (colorable) | Opaque |
| Mechanical Properties | ||
| – Tensile Strength | 15-30 MPa (cured) | Higher ACN grades (>40%) show greater strength |
| – Elongation at Break | 200-600% | Less elastic than NR but more wear-resistant |
| – Compression Set | 20-40% (70℃×24h) | Improved by peroxide curing |
| Thermal Properties | ||
| – Service Temperature | -40℃~120℃ (short-term 150℃) | Low-temp flexibility improves with lower ACN |
| – Heat Aging Resistance | Better than NR/CR (with antioxidants) | >70% strength retention after 100℃ aging |
| Chemical Properties | ||
| – Oil Resistance | Resists fuels/lubricants (<30% swell) | Higher ACN = better oil resistance |
| – Chemical Resistance | Resists weak acids/alkalis; dissolves in ketones/esters | Avoid acetone/ethyl acetate |
Processing Characteristics
Mastication Required
- Open mill mixing (40-50℃) to reduce Mooney viscosity
Curing Systems
- Sulfur vulcanization (1.5-2 phr sulfur + accelerators)
- Peroxide curing (lower compression set)
Molding Processes
- Compression/transfer molding (140-180℃×5-15 mins)
- Extrusion (die temp: 80-100℃)
Common Application Areas
-
Automotive: Fuel hoses, crankshaft seals
-
Industrial: Roller covers, conveyor belt layers
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Oil & Gas: Blowout preventer seals, oil transfer hoses
-
Appliances: Washing machine hoses, dishwasher gaskets
NBR Modified Types
Type |
ACN Content |
Characteristics |
Typical Applications |
|---|---|---|---|
| Low-ACN NBR | 18-25% | Good low-temp flexibility, moderate oil resistance | Freezer seals, cold-resistant hoses |
| Medium-ACN NBR | 26-35% | Balanced oil resistance/elasticity | Automotive oil seals, hydraulic hoses |
| High-ACN NBR | 36-50% | Superior oil resistance, high hardness | Fuel lines, petrochemical seals |
| HNBR (Hydrogenated NBR) | – | 2x better heat/ozone resistance | Auto timing belts, aerospace seals |
| XNBR (Carboxylated NBR) | – | 30% higher wear/tear strength | Mining roller covers, industrial pads |
Advantages & Disadvantages
Advantages |
Disadvantages |
|---|---|
| Best overall elasticity (rebound >80%) | Poor aging resistance (needs additives) |
| Ultra-high tear strength (50-100 kN/m) | Very poor oil/solvent resistance |
| Renewable resource (rubber tree sap) | Mechanical strength lower than synthetic rubbers |
Other Elastomer & Rubber Material Selection
NR Rubber
PU Rubber
IIR Rubber
FKM Rubber
TPU Rubber
FAQ Of NBR Materials
Visit our FAQ center for more questions.
What is NBR rubber?
NBR rubber (Nitrile Butadiene Rubber) is a synthetic rubber made from the copolymerization of butadiene and acrylonitrile, known for its excellent oil resistance, commonly used in oil seals, hoses, and other oil-resistant products.
How is the oil resistance of NBR rubber?
The oil resistance of NBR rubber depends on the acrylonitrile content—higher acrylonitrile content improves oil resistance but reduces low-temperature flexibility.
Which industries is NBR rubber suitable for?
It is widely used in automotive (oil seals, fuel hoses), petrochemical (oil-resistant hoses), aerospace (seals), and food processing (FDA-compliant rubber parts) industries.