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TPE Material Development Case: Application Analysis of Food-Grade Coated PP Lunch Boxes EN60D-SPJCH

Time of issue:2026-01-19

TPE Material Development Case: Application of EN60D-SPJCH Food-Grade Coated PP Lunch Boxes

2025-05-17 10:48 · Shu Bo New Materials

TPE Material Development Case: EN60D-SPJCH Food-Grade Coated PP Application

I. Product Overview

Product Model	EN60D-SPJCH
Product positioning	High-mobility, food-grade TPE-coated material
Core Advantages	Fast forming, comfortable feel, and excellent weather resistance.
Target application	Food-contact rubber-coated products (such as food container lids)

II. Key Physical Property Parameters

Material properties	Parameter/Description
Liquidity	High (Melt Index: 9 g/10 min, 2.16 kg @ 190℃)
Specific gravity	0.94 g/cm³
Hardness	60-62 Shore A
Mechanical properties	Tensile strength: 4 MPa Fracture elongation: 500% Tear strength: 20 kN/m
Molding process	Injection molding at 200℃
Rubber-coated substrate	PP (can be directly overmolded with secondary injection)
Special certification	Passed food-grade testing (FDA 177.1810)

III. Application Case: Development of Food Lunch-Box Lids

1. Customer needs

Functional Requirements PP-based material with rubber coating, enhancing the lid’s sealing performance and feel.
Performance requirements ：
- Passed food-grade testing such as FDA/LFGB.
- High production efficiency (rapid prototyping)
- Long-term weather resistance (anti-aging)

Experience Requirements : Fine and smooth surface with a soft, flexible feel

2. Development Challenges

Preliminary Selection Material ES60C-01 Question:
- Long molding cycle (insufficient fluidity)
- Bonding strength of the rubber coating does not meet the standard.

The customer is sensitive to production efficiency (requiring rapid mass production).

3. Solution

Material substitution Recommended EN60D-SPJCH, optimized formulation:
Adjust the melt flow rate (increase to 9 g/10 min)
Enhance polarity compatibility with PP.
Process matching ：
Injection molding temperature: 190-200℃
Mold temperature control: 40-50℃ (shortens cooling time)

4. Verification Results

Test item	EN60D-SPJCH Performance
Molding efficiency	Injection molding cycle shortened by 30% (compared to ES60C-01)
Bonding strength of the rubber coating	No delamination at the PP/TPE interface (passing the 48-hour boiling water test).
Food-grade testing	Complies with FDA 21 CFR 177.1810
End-user experience	Customer feedback: “The rebound when pressing is soft, and the opening and closing feel smooth.”

IV. Summary of Technical Highlights

High-flow design Supports rapid filling of thin-walled parts, reducing the risk of sink marks.
Environmental Compliance : Phthalate-free plasticizers, meeting food contact standards.
Process Compatibility Compatible with existing PP injection molding production lines—no equipment modification required.
Cost optimization Specific gravity ≤ 0.95; single-piece material consumption reduced by 5-8%.

V. Suggestions for Expanding Applications

Baby and infant product handle
Soft-touch components for medical devices
Outdoor gear waterproof seal ring

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