To select the appropriate SEBS according to the needs of the TPE application field or scenario, it is necessary to comprehensively consider the various performance indicators of SEBS, including molecular weight, molecular structure, styrene content, shore hardness, tensile strength, elongation at break, tensile stress, etc.

1. Characteristics of different performance indicators of SEBS
1. Molecular weight
High molecular weight SEBS: It is suitable for making products that require good mechanical properties, good heat resistance, good resilience and small deformation. High molecular weight SEBS has higher strength after oil filling, and has better physical and mechanical properties and heat resistance.
Low molecular weight SEBS: Low molecular weight SEBS flows well during processing and is easy to mold.

2. Molecular structure
Linear structure SEBS: Good elasticity, suitable for applications that require high elasticity. The linear structure of the SEBS molecular chain is more free, which can provide better elastic recovery.
Star structure SEBS: good stability, good weather resistance, good flowability, suitable for applications that require good processing performance and stability.

3. Styrene content
High styrene content SEBS: high hardness and strength, suitable for applications that require high strength and hardness, but with reduced heat resistance.
Low styrene content SEBS: Good elasticity and softness, suitable for applications that require softness and elasticity.

4. Shore hardness
Shore hardness is a measure of how hard and soft a material is. Choose the appropriate hardness range according to the application requirements, such as high hardness products can choose high hardness SEBS, and products that need softness choose low hardness SEBS.

5. Tensile strength
High strength requirements: For applications that need to withstand high tensile stresses, SEBS with higher tensile strength should be selected.
Medium Strength Requirements: For general applications, medium tensile strength SEBS can be chosen.

6. Elongation at break

Elongation at break is a measure of the toughness of a material. For applications that require good toughness, SEBS with a high elongation at break should be chosen.

7. Tensile stress

Tensile stress is an index that measures the stress magnitude of a material at a certain elongation. For applications that need to withstand a certain amount of stress, SEBS with a higher tensile stress should be chosen.

2. Suggestions for selecting SEBS for common application fields

When formulating specific formulations, the appropriate type of SEBS should be determined according to the performance requirements of the specific application, and whether its performance meets the requirements through experiments. Here are some general recommendations for specific application scenarios:
Medical field: choose SEBS with low molecular weight and good biocompatibility.
Sports equipment: SEBS with linear structure, high elasticity and high elongation at break are selected.
Auto parts: Choose SEBS with high strength, high heat resistance, and good processing performance.
Toy field: choose SEBS with low styrene content, low hardness and high elasticity.
Sealing field: Select SEBS with moderate hardness and high elasticity.
Adhesive field: choose low molecular weight SEBS.
Bicycle accessories or casters: Choose high molecular weight SEBS.

In the actual formulation, it is necessary to flexibly apply the performance characteristics of different grades of SEBS, such as high and low molecular weight SEBS, linear star SEBS, high and low styrene content SEBS, and different tensile strength SEBS for targeted blending, learn from each other's strengths, and make the strength, resilience, tensile properties and other properties close to the application performance through proportioning.