We unleash your business potential by maximize the business innovation.
Send EmailStyrene Butadiene Rubber, Emulsion SBR, SBR, E-SBR, S-SBR, Buna-S, GR-S, 9003-55-8
STYRENE BUTADIENE RUBBER (SBR)
Styrene Butadiene Rubber / SBR / Emulsion SBR / E-SBR / S-SBR / Buna-S / GR-S
CAS Number: 9003-55-8
EINECS: 618-370-0
1. PRODUCT IDENTIFICATION AND CHEMICAL IDENTITY
| Parameter | Description |
|---|---|
| Product Name | Styrene Butadiene Rubber (SBR) |
| Other Names | Buna-S, GR-S, Synthetic Rubber, Artificial Rubber |
| CAS Number | 9003-55-8 |
| EINECS | 618-370-0 |
| Chemical Formula | (C₈H₈·C₄H₆)ₓ |
| Molecular Weight | Variable (depends on degree of polymerization) |
| Chemical Class | Synthetic rubber (copolymer of styrene and butadiene) |
| Appearance | Solid (bales) or viscous liquid |
| Odor | Characteristic rubber odor |
| Density | ~1.04 g/cm³ (at 25°C) |
| Melting Point | ~253°C (decomposes) |
| Refractive Index | ~1.57 |
| Glass Transition Temperature (Tg) | -55°C to -35°C (depends on styrene content) |
| Solubility | Soluble in solvents with solubility parameters between 7.7-9.4 |
Styrene Butadiene Rubber (SBR) is the most widely used synthetic rubber, accounting for approximately 50% of global synthetic rubber production. It is a copolymer of styrene (approximately 23.5% by weight) and butadiene (approximately 76.5% by weight). SBR was developed during World War II as a substitute for natural rubber and has since become one of the most important elastomers in the world. It is produced by two primary methods: emulsion polymerization (E-SBR) and solution polymerization (S-SBR). SBR exhibits excellent abrasion resistance, good aging resistance, and superior processing characteristics. It is widely used in tire manufacturing, automotive parts, industrial products, footwear, and consumer goods.
2. SBR TYPES AND CLASSIFICATION
2.1. Emulsion SBR (E-SBR)
E-SBR is produced by emulsion polymerization and accounts for approximately 70% of total SBR production. It is further divided into hot and cold polymerization types.
| Type | Polymerization Temperature | Characteristics | Applications |
|---|---|---|---|
| Hot E-SBR | 50-60°C | Low mill shrinkage, good dimensional stability, good extrusion properties | General-purpose rubber products, mechanical goods |
| Cold E-SBR | ~5°C | Better abrasion resistance, superior tensile strength, improved tread wear and dynamic properties | Tire treads, high-performance applications |
E-SBR Grades:
| Grade | Description | Mooney Viscosity | Oil Content | Applications |
|---|---|---|---|---|
| SBR 1500 | Standard cold emulsion SBR | 50-55 MU | None | General-purpose tires, mechanical goods, automotive parts |
| SBR 1712 | Oil-extended SBR (25 phr oil) | 50-55 MU | 25 phr aromatic oil | Tire treads, industrial products, cost-effective applications |
| SBR 1723 | Oil-extended SBR (25 phr oil) | 50-55 MU | 25 phr naphthenic oil | Tire treads, similar to 1712 with different oil type |
| SBR 1502 | Antioxidant-free version | 50-55 MU | None | Applications requiring specific antioxidant systems |
| SBR 1507 | Very low Mooney viscosity | 35-40 MU | None | High filler loading, easy processing |
2.2. Solution SBR (S-SBR)
S-SBR is produced by anionic polymerization using alkyl lithium initiators in an organic solvent. It offers superior properties compared to E-SBR.
| Property | S-SBR | E-SBR |
|---|---|---|
| Styrene Content | Up to 60% (tailored) | ~23.5% (fixed) |
| Molecular Weight Distribution | Narrow | Broad |
| Processing | More difficult (narrow MW distribution) | Easier (broad MW distribution) |
| Wet Traction | Excellent (higher styrene content possible) | Good |
| Rolling Resistance | Low (superior fuel economy) | Moderate |
| Abrasion Resistance | Excellent | Good |
| Tensile Strength | Superior | Good |
3. TECHNICAL SPECIFICATIONS
Typical Specifications for SBR Grades:
| Parameter | SBR 1500 | SBR 1712 | SBR 1723 |
|---|---|---|---|
| Styrene Content | 23.5% (typical) | 23.5% (typical) | 23.5% (typical) |
| Mooney Viscosity (ML 1+4 at 100°C) | 50-55 MU | 50-55 MU | 50-55 MU |
| Oil Content | None | 25 phr | 25 phr |
| Oil Type | - | Aromatic Oil | Naphthenic Oil |
| Ash Content (max) | 0.5% | 0.5% | 0.5% |
| Volatile Matter (max) | 0.75% | 0.75% | 0.75% |
| Organic Acid (min) | 5.0% | 5.0% | 5.0% |
| Soap (max) | 0.5% | 0.5% | 0.5% |
| Antioxidant Content | 1.0-1.5% | 1.0-1.5% | 1.0-1.5% |
4. PHYSICAL AND CHEMICAL PROPERTIES
| Property | Value |
|---|---|
| Density | ~1.04 g/cm³ |
| Glass Transition Temperature (Tg) | -55°C to -35°C (depends on styrene content) |
| Refractive Index | ~1.57 |
| Tensile Strength (uncured) | Low |
| Tensile Strength (vulcanized) | 15-25 MPa (depending on formulation) |
| Elongation at Break (vulcanized) | 400-700% |
| Abrasion Resistance | Excellent |
| Tear Resistance | Good |
| Ozone Resistance | Poor (requires antioxidants/antiozonants) |
| Weather Resistance | Fair |
| Oil Resistance | Poor |
| Electrical Insulation | Good |
| Solubility | Soluble in aromatic hydrocarbons, chlorinated hydrocarbons, ketones |
5. PRODUCTION METHODS
5.1. Emulsion SBR (E-SBR) Production
Process Steps:
-
Monomer Preparation: Styrene and butadiene are mixed in approximately 23.5:76.5 ratio.
-
Emulsification: Monomers are emulsified with water using emulsifiers (soap).
-
Polymerization: Polymerization is initiated using free-radical initiators (e.g., potassium persulfate) at controlled temperatures.
-
Hot E-SBR: 50-60°C
-
Cold E-SBR: ~5°C
-
-
Termination: The reaction is terminated by adding a shortstop agent (e.g., sodium dimethyldithiocarbamate).
-
Stripping: Unreacted monomers are removed by steam stripping.
-
Coagulation: The latex is coagulated using salt and acid.
-
Drying: The coagulated rubber is dried and baled.
5.2. Solution SBR (S-SBR) Production
Process Steps:
-
Monomer Preparation: Styrene and butadiene (variable ratios) are dissolved in an organic solvent.
-
Polymerization: Anionic polymerization is initiated using alkyl lithium initiators (e.g., n-butyllithium).
-
Control: Molecular weight is controlled by adjusting initiator concentration.
-
Termination: The reaction is terminated by adding water or alcohol.
-
Solvent Recovery: The solvent is recovered and recycled.
-
Drying: The rubber is dried and baled.
6. ADVANTAGES OF SBR
| Advantage | Description |
|---|---|
| Abrasion Resistance | Excellent, superior to natural rubber |
| Cost-Effective | Generally less expensive than natural rubber |
| Good Tensile Strength | Comparable to natural rubber with proper formulation |
| Processing Characteristics | Easier processing, especially E-SBR grades |
| Wide Range of Grades | Available in many grades for specific applications |
| Consistent Quality | Synthetic production ensures consistent properties |
| Aging Resistance | Good resistance to oxidation and aging |
| Electrical Insulation | Good electrical properties |
7. LIMITATIONS
| Limitation | Description |
|---|---|
| Poor Ozone Resistance | Requires antioxidants/antiozonants in formulations |
| Poor Oil Resistance | Not suitable for applications requiring oil resistance |
| Poor Weather Resistance | Degrades under UV exposure without additives |
| Low Tear Strength | Lower than natural rubber |
| Poor Green Strength | Low strength in uncured state |
| Heat Build-up | Higher than natural rubber under dynamic conditions |
8. APPLICATIONS AND INDUSTRIAL USES
8.1. Tire Industry (Largest Application - ~70%)
| Application | Recommended Grade |
|---|---|
| Passenger Car Tire Treads | SBR 1500, SBR 1712, SBR 1723, S-SBR |
| Truck and Bus Tire Treads | SBR 1500, SBR 1712 |
| Tire Sidewalls | SBR 1500 |
| Tire Inner Liners | SBR 1500 |
| Retread Materials | SBR 1712, SBR 1723 |
8.2. Industrial Rubber Products
| Application | Recommended Grade |
|---|---|
| Conveyor Belts | SBR 1500, SBR 1712 |
| Hoses and Tubing | SBR 1500 |
| Gaskets and Seals | SBR 1500 |
| Rubber Rollers | SBR 1500 |
| Vibration Dampers | SBR 1500 |
8.3. Footwear
| Application | Recommended Grade |
|---|---|
| Shoe Soles | SBR 1500, SBR 1712 |
| Athletic Footwear | S-SBR |
| Industrial Footwear | SBR 1500 |
8.4. Other Applications
| Application | Recommended Grade |
|---|---|
| Floor Tiles | SBR 1500 |
| Rubber Mats | SBR 1500 |
| Adhesives | SBR latex |
| Coatings | SBR latex |
| Foam Products | SBR latex |
9. COMPARISON WITH NATURAL RUBBER
| Property | SBR | Natural Rubber (NR) |
|---|---|---|
| Source | Synthetic | Natural (Hevea tree) |
| Cost | Lower | Higher |
| Tensile Strength | Good (15-25 MPa) | Excellent (20-30 MPa) |
| Tear Strength | Good | Excellent |
| Abrasion Resistance | Excellent | Good |
| Aging Resistance | Good | Fair |
| Ozone Resistance | Poor | Poor |
| Oil Resistance | Poor | Poor |
| Heat Build-up | Higher | Lower |
| Green Strength | Poor | Excellent |
| Consistency | Excellent | Variable |
10. PACKAGING AND SHIPPING
| Packaging Option | Details |
|---|---|
| Bale Weight | 33.33 kg or 35 kg |
| Bale Dimensions | ~70 cm x 35 cm x 18 cm |
| Pallet Configuration | 36 bales/pallet = 1.26 MT |
| Pallet Type | Wooden pallet, shrink-wrapped |
| Container Capacity (20-ft) | 16 pallets = 20.16 MT |
| Container Type | Standard 20-ft container |
11. STORAGE AND HANDLING
| Parameter | Information |
|---|---|
| Storage Conditions | Cool, dry, well-ventilated area; away from direct sunlight |
| Recommended Temperature | Below 30°C |
| Humidity | Avoid high humidity to prevent mold growth |
| Shelf Life | 12-24 months under proper storage conditions |
| Handling | Avoid contamination with oils, solvents, and dirt |
| Protection | Keep bales covered and protected from moisture and dust |
| Stacking | Maximum 4-5 pallets high for stable storage |
12. SAFETY AND HEALTH INFORMATION
| Parameter | Information |
|---|---|
| Toxicity | Non-toxic |
| Skin Irritation | Non-irritant |
| Eye Irritation | Mild irritant (dust) |
| Inhalation | May cause respiratory irritation (dust) |
| Flammability | Combustible (can burn) |
| Fire Extinguishing Media | Water spray, foam, CO₂, dry chemical powder |
| Special Hazards | Burning produces toxic fumes (CO, CO₂, SO₂) |
13. FIRST AID MEASURES
| Exposure Route | Action |
|---|---|
| Inhalation | Move person to fresh air. If irritation persists, seek medical attention. |
| Skin Contact | Wash with soap and water. Remove contaminated clothing. |
| Eye Contact | Rinse with plenty of water for at least 15 minutes. Seek medical attention if irritation persists. |
| Ingestion | Rinse mouth. Do NOT induce vomiting. Seek medical attention if large amounts are swallowed. |
14. REGULATORY INFORMATION
| Region | Status |
|---|---|
| EU | REACH registered |
| Turkey (KKDİK) | Mandatory compliance; requires registration |
| USA (TSCA) | Listed |
| Canada (DSL) | Listed |
| Australia (AICS) | Listed |
| Japan (ENCS) | Listed |
| Korea (KECL) | Listed |
| China (IECSC) | Listed |
Regulatory Status:
| Status | Information |
|---|---|
| HS Code | 40021900 |
| CAS Number | 9003-55-8 |
| EINECS | 618-370-0 |
| IARC Classification | Not classified |
| WGK Germany | 1 (slight hazard to water) |
15. OTHER NAMES AND DATABASE IDENTIFIERS
| Category | Names / Identifiers |
|---|---|
| Product Names | Styrene Butadiene Rubber, SBR, Synthetic Rubber, Artificial Rubber |
| Trade Names | Buna-S, GR-S, SP Rubber |
| Grade Names | SBR 1500, SBR 1502, SBR 1507, SBR 1712, SBR 1723 |
| Process Types | E-SBR (Emulsion SBR), S-SBR (Solution SBR) |
Database Identifiers:
| Database | Identifier |
|---|---|
| CAS | 9003-55-8 |
| EINECS | 618-370-0 |
| HS Code | 40021900 |
16. HISTORY
SBR was developed during World War II as a synthetic alternative to natural rubber, which was in short supply due to Japanese occupation of Southeast Asian rubber-producing regions. The US government initiated a program to develop synthetic rubber, resulting in the production of GR-S (Government Rubber-Styrene). The development of SBR was a major technological achievement and laid the foundation for the modern synthetic rubber industry. Today, SBR accounts for approximately 50% of global synthetic rubber production and remains the most widely used synthetic rubber in the world.
17. INDUSTRY SUITABILITY TABLE
| Industry | Applications | Recommended Grades | Suitability |
|---|---|---|---|
| Tire Industry | Passenger, truck, OTR tires | SBR 1500, SBR 1712, SBR 1723, S-SBR | High |
| Industrial Products | Conveyor belts, hoses, gaskets | SBR 1500 | High |
| Footwear | Shoe soles | SBR 1500, SBR 1712 | High |
| Automotive Parts | Seals, mounts, dampers | SBR 1500 | High |
| Construction | Floor tiles, mats | SBR 1500 | High |
| Adhesives | PSA, coatings | SBR latex | High |
| Foam Products | Mattresses, cushions | SBR latex | High |
18. COMPARISON OF SBR GRADES
| Property | SBR 1500 | SBR 1502 | SBR 1507 | SBR 1712 | SBR 1723 |
|---|---|---|---|---|---|
| Mooney Viscosity | 50-55 | 50-55 | 35-40 | 50-55 | 50-55 |
| Oil Content | None | None | None | 25 phr | 25 phr |
| Oil Type | - | - | - | Aromatic | Naphthenic |
| Processing | Good | Good | Excellent | Good | Good |
| Tensile Strength | Good | Good | Good | Moderate | Moderate |
| Cost | Moderate | Moderate | Moderate | Lower | Lower |
19. ADVANTAGES OF S-SBR OVER E-SBR
| Property | S-SBR | E-SBR |
|---|---|---|
| Wet Traction | Superior | Good |
| Rolling Resistance | Lower | Higher |
| Abrasion Resistance | Superior | Good |
| Tensile Strength | Superior | Good |
| Processing | More difficult | Easier |
| Styrene Content Flexibility | High (up to 60%) | Fixed (~23.5%) |
| Molecular Weight Distribution | Narrow | Broad |
20. SUMMARY AND CRITICAL WARNINGS
SUMMARY:
Styrene Butadiene Rubber (SBR) is the most widely used synthetic rubber, accounting for approximately 50% of global synthetic rubber production. It is a copolymer of styrene and butadiene, produced by emulsion polymerization (E-SBR) or solution polymerization (S-SBR). Common grades include SBR 1500 (standard), SBR 1502 (antioxidant-free), SBR 1507 (low Mooney), SBR 1712 (oil-extended with aromatic oil), and SBR 1723 (oil-extended with naphthenic oil). SBR exhibits excellent abrasion resistance, good tensile strength, and consistent quality. It is used primarily in tire manufacturing (~70%), industrial products, footwear, and consumer goods. SBR is non-toxic, combustible, and requires storage in cool, dry conditions. HS Code: 40021900.
Key Properties:
| Property | Value |
|---|---|
| Appearance | Solid (bales) |
| CAS Number | 9003-55-8 |
| Density | ~1.04 g/cm³ |
| Glass Transition Temperature | -55°C to -35°C |
| Primary Grades | SBR 1500, SBR 1712, SBR 1723 |
| Primary Use | Tires (~70%), industrial products, footwear |
Major Application Areas:
| Industry | Applications |
|---|---|
| Tire Industry | Passenger, truck, OTR tires |
| Industrial Products | Conveyor belts, hoses, gaskets |
| Footwear | Shoe soles |
| Automotive Parts | Seals, mounts, dampers |
| Construction | Floor tiles, mats |
| Adhesives | PSA, coatings |
Key Safety Points:
-
NON-TOXIC: Generally safe for handling
-
COMBUSTIBLE: Can burn; keep away from ignition sources
-
STORAGE: Store in cool, dry, well-ventilated area; avoid direct sunlight and high humidity
-
PPE RECOMMENDED: Dust mask, safety goggles, protective gloves (for handling)
-
PROTECT: Keep away from oils, solvents, and contaminants
CRITICAL WARNINGS:
-
SBR is the most widely used synthetic rubber, accounting for approximately 50% of global synthetic rubber production.
-
E-SBR (Emulsion SBR) accounts for approximately 70% of SBR production and is divided into hot (50-60°C) and cold (~5°C) polymerization types. Cold E-SBR offers better abrasion resistance and tensile strength.
-
S-SBR (Solution SBR) offers superior wet traction, lower rolling resistance, and higher abrasion resistance compared to E-SBR.
-
SBR 1500 is the standard general-purpose grade. SBR 1712 and SBR 1723 are oil-extended grades with lower cost and moderate mechanical properties.
-
SBR has poor ozone and oil resistance and requires antioxidants/antiozonants in formulations.
-
SBR is used primarily in tire manufacturing (~70% of SBR production).
-
SBR has lower tear strength and green strength compared to natural rubber.
-
SBR was developed during World War II as a synthetic alternative to natural rubber (GR-S - Government Rubber-Styrene).
-
S-SBR allows for higher styrene content (up to 60%) and narrower molecular weight distribution, enabling tailored properties.
Important Disclaimer: This Technical Data Sheet (TDS) is for informational purposes only. The information provided is based on available data and is believed to be accurate. However, the user is solely responsible for determining the suitability of the product for their specific application and for complying with all applicable regulations and safety requirements. For complete safety, handling, storage, and regulatory compliance information, always refer to the official Safety Data Sheet (SDS/MSDS) provided by the manufacturer/supplier.
