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SBR
Material Type
Rubber
Material Full Name
Styrene-Butadiene Rubber
Process Compatibility
Injection Molding, Compression Molding
Basic Properties
Property |
Parameter/Performance |
Remarks |
|---|---|---|
| Chemical Name | Styrene-Butadiene Rubber | Copolymer of styrene (23.5%-40%) and butadiene |
| Molecular Structure | Non-crystalline elastomer | Emulsion SBR (E-SBR) vs solution SBR (S-SBR) differ significantly |
| Density | 0.93~0.96 g/cm³ | Slightly heavier than NR |
| Color | Light yellow to tan (carbon black colorable) | Opaque |
| Mechanical Properties | ||
| – Tensile Strength | 15-25 MPa (unfilled)/20-30 MPa (carbon-filled) | Reinforced strength approaches NR |
| – Elongation at Break | 300-800% | Lower elasticity than NR (rebound: 50-70%) |
| – Wear Resistance | Superior to NR (abrasion loss 0.3-0.8 cm³/1.61 km) | Preferred for tire treads |
| Thermal Properties | ||
| – Service Temperature | -50℃~100℃ (short-term 120℃) | Inferior low-temp performance vs NR (Tg: -60℃~-50℃) |
| – Heat Aging Resistance | Better than NR (with antioxidants) | >80% strength retention after 7 days at 100℃ |
| Chemical Properties | ||
| – Ozone Resistance | Poor (requires wax/anti-ozonants) | Outdoor use needs protection |
| – Chemical Resistance | Resists weak acids/alkalis; swells in oils/solvents | Avoid gasoline/lubricants |
Processing Characteristics
Mastication Required:
- Mooney viscosity ML(1+4)100℃: 45-60 (needs breakdown)
Curing Systems:
- Sulfur vulcanization (1.5-2.5 phr sulfur + accelerators CZ/DM)
- Semi-efficient cure (improves heat resistance)
Molding Processes:
- Compression (140-160℃×5-10 mins)
- Extrusion (die temp: 90-110℃)
Common Application Areas
-
Tires: Passenger tire treads (70% usage), truck tire sidewalls
-
Industrial: Conveyor belts, molded products
-
Consumer Goods: Shoe soles, rubber toys
-
Construction: Waterproof membranes, seals
NBR Modified Types
Type |
Styrene Content |
Characteristics |
Typical Applications |
|---|---|---|---|
| E-SBR 1502 | 23.5% | General purpose, good processability | Tire carcasses, conveyor belts |
| S-SBR 2557 | 25% | Low rolling resistance/wet grip | Green tire treads |
| High-Styrene SBR | 40-50% | High hardness (Shore A 80-95) | Shoe soles, flooring |
| Oil-Extended SBR | – | Low cost, improved flexibility | Vibration dampers, hoses |
| Carboxylated SBR (XSBR) | – | Enhanced adhesion/wear resistance | Adhesives, industrial linings |
Advantages & Disadvantages
Advantages |
Disadvantages |
|---|---|
| Best abrasion/tear resistance (tire applications) | High heat buildup (dynamic performance < NR) |
| Better aging resistance than NR | Inferior elasticity/low-temp flexibility |
| Cost-effective (60-70% NR price) | Poor oil resistance |
Other Elastomer & Rubber Material Selection
NR Rubber
PU Rubber
IIR Rubber
FKM Rubber
TPU Rubber
FAQ Of SBR Materials
Visit our FAQ center for more questions.
What is SBR rubber?
SBR rubber (Styrene-Butadiene Rubber) is a copolymer of styrene and butadiene, known for its wear resistance, aging resistance, and good elasticity, widely used in tires, shoe soles, and other products.
What are the advantages and disadvantages of SBR rubber?
Advantages include low cost and good processability; disadvantages are poor oil and ozone resistance, as well as limited high-temperature performance.
What are the main applications of SBR rubber?
It is primarily used in automotive tires, conveyor belts, rubber shoes, seals, and industrial rubber products.