We unleash your business potential by maximize the business innovation.
Send EmailHydrogenated Styrene Butadiene Copolymer, Hydrogenated Styrene Isoprene Copolymer, SEBS, SEPS, 66070-58-4, 68648-89-5
HYDROGENATED STYRENE BLOCK COPOLYMERS
SEBS / SEPS (Thermoplastic Elastomer - TPE-S)
| Parameter | SEBS | SEPS |
|---|---|---|
| Chemical Name | Styrene-Ethylene-Butylene-Styrene Copolymer | Styrene-Ethylene-Propylene-Styrene Copolymer |
| CAS Number | 66070-58-4 | 68648-89-5 |
| EINECS | Not registered (polymer) | Not registered (polymer) |
| REACH Registration No | Available | Available |
| HS Code | 3903.90.00.00.00 | 3903.90.00.00.00 |
Description: Both products belong to the hydrogenated styrene block copolymer family. SEBS is produced by hydrogenation of the butadiene mid-block, while SEPS is produced by hydrogenation of the isoprene mid-block. Both are thermoplastic elastomers (TPE-S) with exceptional weatherability and thermal stability.
| Parameter | SEBS | SEPS |
|---|---|---|
| Styrene / Elastomer Ratio | 30/70 (typical) | 30/70 (typical) |
| Hydrogenation Degree | ≥ 98% | ≥ 98% |
| Molecular Weight (Mn) | 50,000 – 150,000 g/mol | 50,000 – 150,000 g/mol |
| Polydispersity (PDI) | 1.05 – 1.15 | 1.05 – 1.15 |
| Crosslinking Type | Physical (Styrene end-blocks) | Physical (Styrene end-blocks) |
Description: Styrene end-blocks form rigid, glassy domains at room temperature, creating physical crosslinks. This unique structure provides thermoplastic processability combined with elastomeric recovery properties, eliminating the need for chemical vulcanization.
| Parameter | Specification | Test Method |
|---|---|---|
| Color | White / Natural (transparent) | Visual Inspection |
| Form | Pellets or Ground Powder | Visual Inspection |
| Pellet Size | 2 – 5 mm (typical) | Sieve Analysis |
| Powder Size (Optional) | < 500 microns | Sieve Analysis |
| Odor | None | Organoleptic |
| Foreign Matter | Not detectable | Visual Inspection |
Description: Pellet form is optimized for extrusion and injection molding processes. Powder form provides faster dissolution for solution-based applications such as adhesives and coatings.
| Property | Specification | Typical Value | Test Method |
|---|---|---|---|
| Density (g/cm³) | 0.91 – 0.94 | 0.92 | ASTM D792 |
| Specific Gravity | 0.91 – 0.93 | 0.92 | ASTM D792 |
| Bulk Density (Pellets) (kg/m³) | 450 – 550 | 500 | ASTM D1895 |
| Bulk Density (Powder) (kg/m³) | 300 – 400 | 350 | ASTM D1895 |
Description: Low density provides significant advantages in lightweight composite applications and reduces transportation and logistics costs.
| Property | Specification | SEBS | SEPS | Test Method |
|---|---|---|---|---|
| Melting Temperature (Tm) | 200 – 250 °C | 220 °C | 235 °C | DSC |
| Tg (Elastomer Block) | -65 / -55 °C | -62 °C | -60 °C | DSC |
| Tg (Styrene Block) | 85 – 95 °C | 90 °C | 92 °C | DSC |
| Crystallization Temperature (Tc) | 180 – 220 °C | 195 °C | 205 °C | DSC |
Description: SEPS exhibits approximately 15°C higher melting temperature compared to SEBS due to the propylene units in its mid-block. This makes SEPS more suitable for higher temperature applications.
| Property | Specification | Typical Value | Test Method |
|---|---|---|---|
| Onset Degradation (N₂) | ≥ 280 °C | 295 °C | TGA (1% weight loss) |
| Onset Degradation (Air) | ≥ 250 °C | 260 °C | TGA (1% weight loss) |
| Maximum Continuous Service Temp | – | 120 °C | Continuous use |
| Maximum Short-Term Temp | – | 180 °C | < 1 hour |
Description: The fully hydrogenated structure provides 3-4 times higher resistance to oxidative degradation compared to conventional SBS and SIS copolymers, ensuring long-term durability in demanding environments.
| Property | Specification | Typical Value | Test Method |
|---|---|---|---|
| Vicat Softening Point | ≥ 180 °C | 195 °C | ASTM D1525 |
| HDT (0.45 MPa) | ≥ 65 °C | 72 °C | ASTM D648 |
| HDT (1.80 MPa) | ≥ 50 °C | 58 °C | ASTM D648 |
| Ring & Ball Softening Point | – | 190 °C | ASTM E28 |
Description: High softening temperatures ensure dimensional stability and shape retention even in hot environments, making these materials suitable for automotive and industrial applications.
| Property | Specification | Typical Value | Test Method |
|---|---|---|---|
| Hardness (Shore A) | 70 – 90 | 80 | ASTM D2240 (15 sec) |
| Hardness (Shore D) | 25 – 40 | 32 | ASTM D2240 |
| Hardness (Shore A - Instant) | – | 85 | ASTM D2240 |
| Hardness (Shore A - 30 sec) | – | 78 | ASTM D2240 |
Description: Hardness can be precisely adjusted by varying the styrene/elastomer ratio. Higher styrene content increases hardness, while lower styrene content enhances flexibility and softness.
| Property | Specification | Typical Value | Test Method |
|---|---|---|---|
| Tensile Strength | ≥ 15 MPa | 22 MPa | ASTM D638 |
| Elongation at Break | ≥ 400% | 550% | ASTM D638 |
| 100% Modulus | 2.0 – 4.0 MPa | 3.2 MPa | ASTM D638 |
| 300% Modulus | 4.0 – 7.0 MPa | 5.8 MPa | ASTM D638 |
| Yield Strength | – | 18 MPa | ASTM D638 |
Description: The combination of high tensile strength and exceptional elongation demonstrates that the material is both strong and highly flexible. These properties are ideal for dynamic loading applications.
| Property | Specification | Typical Value | Test Method |
|---|---|---|---|
| Tear Resistance (Die C) | ≥ 30 kN/m | 42 kN/m | ASTM D624 |
| Tear Resistance (Die B) | – | 28 kN/m | ASTM D624 |
| Abrasion Resistance | ≤ 150 mm³ | 120 mm³ | ISO 4649 |
| Abrasion Resistance (Taber) | – | 0.05 g/1000 cycles | ASTM D1044 |
Description: High tear resistance indicates excellent durability against cutting and tearing forces. Low abrasion values ensure long service life in wear-prone applications such as footwear and seals.
| Property | Specification | Typical Value | Test Method |
|---|---|---|---|
| Compression Set (22h / 70°C) | ≤ 25% | 18% | ASTM D395 Method B |
| Compression Set (22h / 100°C) | ≤ 35% | 28% | ASTM D395 Method B |
| Compression Set (22h / 23°C) | ≤ 10% | 7% | ASTM D395 Method B |
| Permanent Set | – | 5% | ASTM D412 |
Description: Low compression set values demonstrate the material's excellent recovery capability after prolonged compression. This property is critical for gaskets, seals, and O-ring applications.
| Property | Specification | Typical Value | Test Method |
|---|---|---|---|
| MFR (230°C / 5 kg) | 1 – 5 g/10 min | 3.0 g/10 min | ASTM D1238 |
| MFR (230°C / 2.16 kg) | 10 – 25 g/10 min | 15 g/10 min | ASTM D1238 |
| MFR (200°C / 5 kg) | – | 1.5 g/10 min | ASTM D1238 |
| MFR (190°C / 2.16 kg) | – | 0.5 g/10 min | ASTM D1238 |
Description: MFR values directly influence processability. Low MFR indicates high molecular weight grades with superior mechanical strength. High MFR indicates fluid grades suitable for fast injection molding cycles.
| Property | Specification | Typical Value | Test Method |
|---|---|---|---|
| Melt Viscosity (200°C / 100 s⁻¹) | 500 – 2000 Pa·s | 850 Pa·s | Capillary Rheometer |
| Melt Viscosity (200°C / 1000 s⁻¹) | 200 – 600 Pa·s | 350 Pa·s | Capillary Rheometer |
| Swell Ratio | 1.1 – 1.4 | 1.25 | Internal Method |
| Activation Energy (Flow) | – | 45 kJ/mol | Arrhenius |
Description: The material exhibits shear-thinning (pseudoplastic) behavior. Viscosity decreases at high shear rates, making it ideal for injection molding, while maintaining structural integrity at low shear rates.
| Property | Typical Value | Test Method |
|---|---|---|
| Dielectric Constant (1 MHz) | 2.5 | ASTM D150 |
| Dielectric Loss Factor (1 MHz) | 0.001 | ASTM D150 |
| Dielectric Strength | 22 kV/mm | ASTM D149 |
| Volume Resistivity | ≥ 10¹⁵ Ω·cm | ASTM D257 |
| Surface Resistivity | ≥ 10¹⁴ Ω | ASTM D257 |
| Arc Resistance | 150 sec | ASTM D495 |
Description: Excellent electrical insulation properties make this material ideal for cable insulation, connectors, and electronic component applications where dielectric performance is critical.
| Chemical Type | SEBS / SEPS Resistance |
|---|---|
| Water (Pure) | Excellent |
| Seawater | Excellent |
| Dilute Acids (pH 3-6) | Good |
| Dilute Bases (pH 8-11) | Good |
| Alcohols (Ethanol, Isopropanol) | Good |
| Glycols | Good |
| Oils (Mineral, Synthetic) | Swells (formulate with care) |
| Aromatic Solvents (Toluene, Xylene) | Complete dissolution |
| Aliphatic Solvents (Hexane) | Partial swelling/dissolution |
| Ketones (Acetone, MEK) | Partial dissolution |
| Chlorinated Solvents | Complete dissolution |
Description: Solubility in apolar solvents provides advantages in adhesive and coating formulations. Resistance to polar environments ensures reliable performance in water-based and hygiene applications.
| Parameter | Value | Test Method |
|---|---|---|
| Solubility Parameter (δ) | 16.5 – 17.5 MPa¹/² | Internal Method |
| Hansen Parameter (δd) | 16.5 | Internal Method |
| Hansen Parameter (δp) | 1.5 | Internal Method |
| Hansen Parameter (δh) | 2.5 | Internal Method |
| Solution Viscosity (10%, Toluene) | 100 – 500 cP | Brookfield |
Description: Solubility parameters serve as a reliable guide for selecting appropriate solvents and predicting compatibility with other polymers and additives in formulation development.
| Parameter | Recommendation / Value |
|---|---|
| Pre-Drying (Temperature / Time) | 80°C / 2 – 4 hours |
| Injection Melt Temperature | 210 – 260°C |
| Injection Mold Temperature | 20 – 40°C |
| Extrusion Melt Temperature | 190 – 240°C |
| Blow Molding Temperature | 200 – 230°C |
| Spraying Viscosity (Solution-based) | 50 – 500 cP |
| Recycle/Regrind Ratio | ≤ 20-30% (clean, dry scrap) |
Description: Pre-drying is essential to prevent porosity (gas bubbles) in the melt. Operating temperatures should not exceed 260°C to avoid thermal degradation. Proper temperature control ensures consistent product quality.
| Material / Additive | Compatibility Level |
|---|---|
| Polypropylene (PP) | Complete compatibility |
| Polystyrene (PS) | Complete compatibility |
| Polyethylene (PE) | Moderate to Good |
| Polyamide (PA) | Moderate (compatibilizer can improve) |
| PC / ABS | Moderate (compatibilizer recommended) |
| Calcium Carbonate | Excellent |
| Talc | Excellent |
| Clay / Nanoclay | Good |
| Glass Fiber | Good |
| Mineral Oils | High affinity (swells, plasticizes) |
| Antioxidants | Compatible |
Description: Complete compatibility with PP and PS offers significant advantages in recycling operations and alloy production, enabling cost-effective material optimization.
| Industry Sector | Specific Applications |
|---|---|
| Adhesives & Sealants | Hot Melt Adhesives (HMA), Pressure Sensitive Adhesives (PSA), reactive sealants |
| Coatings | Industrial protective coatings, textile coatings, wood coatings |
| Plastic Modification | PP, PS, PA, PC impact modifiers; flexibility enhancers for engineering plastics |
| Automotive | Airbag covers, interior soft-touch panels, cable insulation, gaskets and weather seals |
| Electronics | Connector seals, flexible cable jackets, vibration dampeners, sensor encapsulations |
| Medical | Blood sets, medical tubing, syringe seals, surgical instrument soft grips |
| Cosmetics & Personal Care | Flexible tubes, closure seals, decorative packaging components |
| Footwear & Sports | Sole layers, protective equipment components, sports accessories |
| Construction | Waterproofing membranes, expansion joint fillers |
| Packaging | Flexible films, heat-shrink packaging, heavy-duty carrying bags |
| Certificate / Standard | Status | Explanation |
|---|---|---|
| ISO 9001:2015 | Certified | Quality Management System in place |
| ISO 14001:2015 | Certified | Environmental Management System |
| REACH (EC 1907/2006) | Compliant | SVHC (Substances of Very High Concern) free |
| RoHS (2011/65/EU) | Compliant | Free of Pb, Hg, Cd, Cr+6, PBB, PBDE |
| FDA 21 CFR 177.1810 | Grade-specific | Food contact approval (check grade code) |
| USP Class VI | Grade-specific | Medical implant and blood contact approval |
| California Prop 65 | Compliant | No warning-required substances |
| VOC Content | < 50 ppm | Low volatile organic compounds, environmentally friendly |
| TSE (Turkish Standards) | Compliant | Suitable for Turkish market |
| GMP (Good Manufacturing Practices) | Medical grades | Batch traceability and full documentation |
| Parameter | Detail |
|---|---|
| Packaging | 25 kg kraft paper bag with PE liner; optional 500-1000 kg big-bags |
| Storage Temperature | +5°C to +35°C |
| Shelf Life | 24 months (in original unopened packaging) |
| Dust Explosion Risk | IG 100 (airborne dust cloud is explosive) |
| PPE Requirements | Dust mask (N95), safety goggles, industrial gloves |
| Fire Extinguishing | CO₂, dry chemical powder, foam (DO NOT use water jet) |
| MSDS | Available upon request |
Disclaimer: This Technical Data Sheet is based on typical laboratory measurements and should not be considered as binding specifications. For binding values, the Certificate of Analysis (COA) for each specific batch must be requested and referenced. The user is responsible for testing the product under their own processing conditions and end-use applications.