Overview
Sinopec Baling SEBS is a hydrogenated derivative of styrene-butadiene-styrene (SBS) block copolymer, produced by Sinopec Baling Petrochemical Company. The hydrogenation process saturates the butadiene segments, enhancing the material's resistance to oxidation, heat, and UV radiation. This modification makes SEBS suitable for long-term outdoor and high-temperature applications where traditional SBS would degrade. SEBS is classified as a thermoplastic elastomer (TPE), combining the processing advantages of plastics with the flexibility of rubber. Its molecular structure consists of rigid polystyrene end blocks and elastic hydrogenated polybutadiene mid-blocks. This architecture enables reversible deformation under stress, making it ideal for dynamic applications like seals and grips.
Physical and Chemical Properties
Baling SEBS exhibits a Shore A hardness range of 30–90, adjustable via polystyrene content and oil extension. Its tensile strength typically falls between 10–25 MPa, with elongation at break exceeding 500%. The material retains elasticity across temperatures from -60°C to 120°C, outperforming many conventional rubbers. Chemically, SEBS resists water, acids, alkalis, and polar solvents due to its non-polar hydrocarbon backbone. However, it swells in non-polar solvents like hexane. Its hydrogenated structure eliminates reactive double bonds, granting exceptional weatherability—5–10 years outdoor use without significant cracking or hardening. The material is FDA-compliant for indirect food contact in many grades.
Main Applications
In adhesives, SEBS serves as a key component in hot-melt formulations for packaging and bookbinding, offering low viscosity at high temperatures and strong substrate adhesion. Footwear manufacturers use it in sole compounds for slip resistance and durability, often blended with polyolefins to reduce costs. The automotive industry employs SEBS in window seals, gaskets, and vibration dampers due to its noise-reducing properties and temperature resilience. Medical applications include tubing and catheter components where clarity and kink resistance are critical. SEBS also modifies bitumen for roofing membranes and plastic compounds (e.g., PP/PE blends) to improve impact strength without compromising recyclability.
Safety and Storage
SEBS presents minimal health risks under normal handling conditions. Dust generated during pellet processing may cause mild respiratory irritation; local exhaust ventilation or NIOSH-approved dust masks are recommended. The material is not classified as hazardous under GHS or OSHA standards. Storage requires protection from moisture (below 50% RH) and temperatures exceeding 40°C to prevent pellet clumping. Bulk bags should be stacked no more than three layers high to avoid compression. Shelf life exceeds two years in original packaging. For fire safety, use CO2 or dry chemical extinguishers—SEBS burns slowly with a sooty flame, releasing styrene vapors above 300°C.
B2B Procurement Guide
When sourcing Baling SEBS, confirm the grade matches your processing method (e.g., injection molding vs. extrusion). Key specifications to request include melt flow index (MFI, typically 1–30 g/10min at 230°C/5kg), oil content (0–50% in pre-extended grades), and block ratio (S/B ratio affects hardness). For large orders (20+ tons), negotiate based on Sinopec's quarterly pricing cycles. Consider container-load shipments to reduce logistics costs. Quality certifications to verify include ISO 9001, REACH, and FDA (if applicable). Lead times average 4–8 weeks ex-factory; maintain 2–3 months' inventory buffer during peak demand periods. Alternative suppliers include Kraton (U.S.) and Kuraray (Japan) for comparable SEBS products.
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