Keywords: TPE; Tensile Strength; Elongation; SEBS I. Performance Requirements by Application Scenario 1.Overmolding for tools / sports equipment handles: high tensile strength, low to medium elongation 2.Phone cases / foot pads / seals / anti-slip sleeves: medium tensile strength + medium elongation 3.Baby teething toys / soft rubber toys / pull toys / flexible gaskets: low tensile strength, high elongation II. Core Regulation of Base Material (SEBS-based, Determining the Fundamental Mechanical Balance) 1.Styrene content: Low content → high elongation, low strength; High content → high strength, low elongation 2.Molecular structure: Linear type → excellent elongation, relatively low strength; Star type → significant improvement in strength, decrease in elongation 3.Molecular weight: Higher molecular weight → higher strength with a slight reduction in elongation (processing performance to be balanced) III. Precise Formula Adjustment (Core Regulation Method for Index Fine-Tuning) 1. Oil filling ratio: Higher ratio → decreased strength, significant improvement in elongation (excess causes stickiness and performance attenuation); Lower ratio → increased strength, decreased elongation 2. Plastic phase (e.g., PP): Higher addition ratio → higher strength, lower elongation (excess leads to loss of elasticity) 3. Filler addition: A small amount of nano-silica → improved strength with little impact on elongation; Excess inert filler (e.g., calcium carbonate) → simultaneous decrease in both strength and elongation IV. Regulation by Auxiliary Additives Crosslinking agent: Appropriate addition → improved tensile strength with little impact on elongation; Excessive addition → over-crosslinking, leading to a sharp decrease in elongation (precise dosage control is required) V. Core Adjustment Principles The base material defines the foundation (select SEBS with matching characteristics) + the formula enables fine-tuning (optimize oil filling ratio, plastic phase, fillers and additives) to achieve precise matching of properties with application scenarios.