Overview
SEBS (Styrene-Ethylene-Butylene-Styrene) is a hydrogenated derivative of SBS (Styrene-Butadiene-Styrene), offering superior thermal stability, UV resistance, and mechanical properties. It retains the elastomeric behavior of SBS while eliminating unsaturated bonds, making it more durable for demanding applications. SEBS is produced via selective hydrogenation of SBS, converting butadiene segments into ethylene-butylene. This process enhances its resistance to oxidation and weathering, broadening its use in outdoor and high-performance products. As a thermoplastic elastomer (TPE), SEBS can be processed like plastics but behaves like rubber.
Physical and Chemical Properties
SEBS exhibits a unique combination of elasticity, toughness, and processability. Its physical properties vary by styrene-to-ethylene/butylene ratio and molecular weight. Typical Shore A hardness ranges from 10 to 90, with tensile strength of 5–20 MPa. Chemically, SEBS is inert to polar solvents and water but dissolves in non-polar solvents like toluene. It resists acids, alkalis, and alcohols but swells in hydrocarbons. Unlike SBS, SEBS does not degrade under UV exposure, making it suitable for outdoor applications like roofing membranes and automotive seals.
Main Applications
SEBS is widely used in adhesive formulations due to its balance of tack and cohesion. Hot-melt adhesives for packaging and hygiene products (e.g., diapers) often incorporate SEBS for its recyclability and low VOC emissions. In consumer goods, SEBS is molded into soft-grip handles, toy parts, and shoe soles. Medical applications include tubing and syringe seals, benefiting from its biocompatibility. Automotive uses range from vibration-damping components to weatherstripping, where durability and flexibility are critical.
Safety and Storage
SEBS is classified as non-hazardous under normal handling conditions. Dust inhalation during processing should be minimized using ventilation or PPE. It is not classified as a skin irritant but may cause mild discomfort upon prolonged contact. Storage recommendations include keeping SEBS in original packaging at temperatures below 40°C. Avoid exposure to moisture and strong oxidizers. Shelf life typically exceeds 2 years if stored properly. Spills can be swept up without requiring special disposal measures.
B2B Procurement Guide
When procuring SEBS, specify technical requirements such as melt flow index (MFI), hardness, and tensile strength. Regulatory compliance (e.g., FDA 21 CFR for food contact or USP Class VI for medical use) should align with end applications. Suppliers often provide custom-compounded SEBS blends with additives like oils or fillers. MOQs for standard grades start at 500 kg, while specialty grades may require larger orders. Lead times vary from 2–8 weeks depending on availability. Pricing fluctuates with styrene monomer costs and global demand.
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