I. Project Background and Challenges

Application areas:   High-end toy doll
Core challenge:   Looking for a material that can replace silicone for manufacturing specific components of toy dolls, provided that the component meets the following requirements: High tensile strength requirement of 21 pounds (approximately 9.5 kilograms) 。
Initial dilemma:   Traditional low-hardness silicone materials cannot meet this tensile strength standard, posing potential quality risks to the product. Therefore, customers urgently need a new elastomeric material that not only offers a soft, silicone-like feel but also provides exceptional mechanical strength.

 

II. Material Selection and Technical Analysis

Faced with this challenge, the development team did not limit itself to traditional silicone but instead turned its attention to thermoplastic elastomers (TPE), which offer more comprehensive advantages. TPE boasts short processing cycles, recyclability, and high design flexibility.

1. Preliminary Plan and Failure Analysis:

• Preferred material:  ES2001R-3/RR25HQ
• Reason for failure:   The mechanical properties of this TPE model, particularly its tensile and tear strength, failed to meet the minimum requirement of 21 pounds of tensile force. This indicates that the material’s internal structure or formulation has shortcomings when subjected to high loads.

2. Technical approach of the successful solution:
The development team quickly adjusted its strategy and conducted a second round of material selection tests, based on the classic materials science principle of “appropriately increasing material hardness in exchange for higher strength.”

• Candidate materials:   ES40A-BK-WJGZ (hardness 42 Shore A) and ES50A-05 (hardness 50 Shore A).
• Core Property Analysis - ES40A-BK-WJGZ:
  • Hardness (42 Shore A):   It strikes the optimal balance between soft touch and structural strength. Too low a hardness—such as that of the previously failed silicone—results in insufficient strength; too high a hardness, on the other hand, may compromise the soft-touch feel.
  • Tensile strength (4 MPa) and elongation at break (600%):   This indicates that the material can withstand significant force and deformation before fracturing—a key factor in the 21-pound tensile test.
  • Tear strength (24 kN/m):   It directly reflects the material’s ability to resist the propagation of notch tearing, making it crucial for doll components that require assembly or load-bearing performance.
  • High fluidity (melt index 7.8 g/10 min):   Ensured excellent Formability This enables the material to quickly and completely fill complex mold cavities, reducing defects such as insufficient filling and shrinkage, and improving production yield and efficiency.
  • Specific gravity (0.89 g/cm³):   Lower than most plastics and rubbers, it helps achieve lightweight products and reduce the material cost per unit.

III. Development Process and Key Decisions

The development process is not something that can be accomplished overnight; it involves meticulous adjustments to the product’s appearance.

1. Performance verification:   Testing has confirmed that the mechanical strength of the ES40A-BK-WJGZ fully meets the 21-pound tensile strength requirement, successfully resolving the core challenge.
2. Appearance optimization:   This material is designed directly for High-rebound matte finish Features that perfectly match the expectations for toy dolls. High-end, soft, and comfortable to the touch. The texture requirements do not necessitate any subsequent secondary processing.
3. Final confirmation:   ES40A-BK-WJGZ in Mechanical properties and Surface appearance All requirements of the customer have been met, and the project has been successfully implemented.

IV. Case Summary and Value

This case is a typical example of material application innovation—successfully replacing silicone with TPE.

• Key to Success:
  • Precise material property positioning:   By selecting a TPE formulation with moderate hardness and high tensile and tear strength, we have overcome the challenge of high tensile strength that silicone rubber cannot address.
  • Comprehensive performance advantages:   The ES40A-BK-WJGZ not only addresses the tensile strength issue, but also offers high fluidity, low specific gravity, and an inherently matte surface—bringing about... Better processing efficiency 、 More economical production costs and Superior texture of the end product 。
• Core values:
  This development case demonstrates that, when faced with specific high-performance requirements, TPE materials can serve as a superior solution compared to traditional silicone. They offer the toy industry—particularly in the segment of high-end toys with stringent demands for safety and durability—a new material option that boasts exceptional cost-effectiveness and ease of processing. Consequently, ES40A-BK-WJGZ has become the benchmark material for addressing application needs such as "high tensile strength, soft touch, and matte finish."