Unveiling a TPE Material Development Case: A Practical Analysis of the ES42HC-WJ Toy Doll Application
Time of issue:2026-03-06
Case Background
In the toy doll manufacturing industry, materials must simultaneously meet multiple requirements, including aesthetic texture, mechanical strength, and cost control. Although the existing material ES40A-BK-1 possesses certain basic performance characteristics, it still suffers from high costs and unstable surface quality. There is an urgent need to develop a substitute material that combines high resilience, a matte transparent appearance, and the ability to pass stringent tensile tests.
Development Goals
- Achieve cost optimization based on the ES40A-BK-1;
- Maintain high resilience characteristics, with an elongation at break of no less than 600%.
- Ensure that the material has excellent tensile and tear strength and can pass the 21-pound tensile test.
- Improve the surface quality of injection molding and eliminate appearance defects such as flow marks.
Development process
Preliminary Testing and Problem Identification
The first trial sample uses model ES40A-01:
- Obvious flow marks appear on the surface, affecting the aesthetic quality of the toy doll.
- Although the mechanical properties nearly meet the requirements, the surface treatment fails to meet the standards, leading to application failure.
Redesign and optimization of the formulation
Based on the initial test questions, the new ES42HC-WJ model has been developed:
- Adjust the transparent matte finish system to enhance surface uniformity and eliminate flow marks.
- Optimize the cost structure while ensuring high resilience (with a fracture elongation of 600%).
- Enhance the tensile and tear performance of the reinforcing material to ensure compliance with tensile testing standards.
Verification and Mass Production
The ES42HC-WJ performed exceptionally well in the customer’s trial mold:
- The surface is smooth and flawless, with a consistent matte and transparent effect.
- Successfully passed the 21-pound tensile test without any fracture or deformation.
- The overall cost has decreased compared to the original plan, resulting in improved cost-effectiveness.
Material Properties
- Physical properties Specific gravity: 0.90 g/cm³; Hardness: 43 Shore A;
- Mechanical Properties Tensile strength: 4 MPa; elongation at break: 600%; tear strength: 25 kN/m.
- Processing performance Melt index: 13 g/10 min (2.16 kg/190℃), with moderate flowability and excellent injection molding performance;
- Appearance characteristics Matte and transparent, with a uniform surface texture and no flow marks.
Application results
The ES42HC-WJ has been successfully applied to toy doll products, achieving the following benefits:
- Improved appearance quality: Uniform matte transparent finish with no surface streaks.
- Reliable mechanical performance: High resilience and high elongation ensure the doll is highly durable and has passed a 21-pound tensile strength test.
- Effective cost control: Achieve material cost optimization while maintaining high performance.
Case Summary
Thanks to its newly formulated design, the ES42HC-WJ not only reduces costs but also effectively addresses the issue of surface flow marks. It meets both the stringent requirements for mechanical strength and aesthetic quality in toy dolls, serving as a successful example of the application of high-rebound, matte-finish, transparent TPE materials in the toy industry.
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