TPE Material Development Case: The R&D Journey of ES100A-LLT, a Specialized Material for High-Hardness Zipper Heads

Time of issue:2026-03-06

I. Project Background and Requirements Analysis

End product Zipper pull (zipper pull ring bag hardware)
Processing method Injection molding at 200℃
Substrate compatibility PP/PE substrate coating

 

Core Performance Requirements ：

  1. High hardness: 58-60 Shore D
  2. Excellent moldability: Good flowability in injection molding.
  3. Wear and scratch resistance: Meets the wear and tear of daily use.
  4. Good hand feel: Comfortable surface texture
  5. Mechanical Properties: Adequate tensile strength and toughness

II. Technical Parameter Objectives

Performance metrics

Target value

Test standards/conditions

Specific gravity

1.06 g/cm³

ASTM D792

Hardness

58-60 Shore D

ASTM D2240

Tensile strength

≥18 MPa

ASTM D412

Fracture elongation

≥450%

ASTM D412

Tear strength

≥155 kN/m

ASTM D624

Melt index

8.4 g/10 min (190℃, 2.16 kg)

ASTM D1238

Molding temperature

200℃ injection molding

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III. Development Process and Solution Optimization

Initial Sample Issue Analysis

Test material grade

Advantages

Disadvantages

Conclusion

ES98A-SL

Hardness meets the requirements.

Poor formability and insufficient fluidity.

Not approved

ES96A-MW

Good formability

Hardness is below the required range.

Not approved

Successful Approach: Design Philosophy for the ES100A-LLT Formulation

  1. Substrate Selection It uses a special hydrogenated styrene-based elastomer to provide a high-hardness base.
  2. Enhanced system Use nano-scale rigid particles for filling to enhance hardness, and employ surface treatment to strengthen interfacial bonding.
  3. Flow modification Optimize the internal lubricant system, regulate the molecular weight distribution, and improve processing flowability.
  4. Surface performance Add special additives to enhance surface wear and scratch resistance.

IV. Verification of Material Performance for ES100A-LLT

Results of Physical and Mechanical Property Tests

Test item

Measured data

Customer requirements

Compliance

Hardness (Shore D)

59D

58-60D

Compliant

Tensile strength

19.2 MPa

≥18 MPa

Compliant

Fracture elongation

480%

≥450%

Compliant

Tear strength

162 kN/m

≥155 kN/m

Compliant

Melt index

8.6 g/10 min

8.4 g/10 min

Compliant

Processing and Application Performance

  • Processing performance Good melt flow and smooth filling; wide molding temperature range (180–210℃); excellent demolding performance.
  • Application testing Strong adhesion to hardware components; passes wear resistance testing; comfortable feel; no cracking after high- and low-temperature cycling.

V. Summary of Key Technical Points

The key to the success of this project lies in resolving the conflict between high hardness and good formability. Through innovative formulation design, we have achieved a balance of performance:

  1. Molecular structure design The rigid and flexible segments are reasonably distributed.
  2. Filling technology Combination of nano-filling and surface treatment technologies.
  3. Additive synergy Select flow promoters and wear-resistant additives specifically tailored to the application.

Conclusion The successfully developed ES100A-LLT material fully meets the comprehensive requirements of high hardness, wear resistance, and excellent moldability for zipper head ring hardware applications, thereby overcoming related technological bottlenecks.

Previous

Innovative Applications of TPEE Material in the Children’s Eyewear Industry: A Case Study on TE65D-ETYJ, a Specialized Material with Weather Resistance性能

Application example of TPE material: The unique use of ZA60-YSAJ high-viscosity material on the buttons of electric toothbrushes.

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