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HDPE vs. LDPE vs. LLDPE MI 7-8: The Ultimate Choice for Injection Molding

HDPE vs. LDPE vs. LLDPE MI 7-8: The Ultimate Choice for Injection Molding

1. Melt Index 7-8: The Sweet Spot for Efficiency

A Melt Index (MI) of 7 to 8 g/10 min is considered optimal for injection molding. It provides enough flowability to fill complex mold cavities while maintaining essential mechanical properties.

2. Technical Comparison Table

Features

HDPE MI 7-8

LDPE MI 7-8

LLDPE MI 7-8

Rigidity

Very High

Low (Flexible)

Moderate

Impact Strength

Fair

Good

Excellent (Puncture Resistance)

Shrinkage Rate

High (1.5 - 4.0%)

Low (1.0 - 2.0%)

Moderate (1.5 - 3.0%)

Clarity

Opaque / Milky

High Transparency

Translucent

3. Which Resin Should You Choose?

  • HDPE MI 7-8: Ideal for rigid caps, small pallets, toys, and products requiring structural stiffness.
  • LDPE MI 7-8: The top choice for soft lids and food containers where gloss and aesthetics are priorities.
  • LLDPE MI 7-8: The perfect solution for thin-walled products needing high environmental stress crack resistance (ESCR).

4. Advantages of High MI (7-8) Resins

  • Cycle Time Reduction: Faster flow reduces injection and cooling phases.
  • Energy Savings: Operates at lower pressures and heating zone temperatures.
  • Superior Surface Finish: Minimizes flow marks and surface roughness defects.

5. Why Choose JM ENTERPRISE?

  • High-Quality Materials: International standard resins ensuring consistent end-product performance.
  • Professional Technical Team: Expert Korean & Vietnamese engineers providing on-site production support.
  • Competitive Pricing: Cost-effective solutions tailored to maximize your profit margins.

📞 LIÊN HỆ / CONTACT US

JM ENTERPRISE – Your Global Chemical & Plastic Solution Partner

  • Hotline/Zalo:
    • +84 933 706 351 (Mr. Cha - English & Korean)
    • +84 913 390 054 (Ms. Ngan - Vietnamese)
  • Email: jhcha@jmentchemical.com
  • Website: https://jmentchemical.com/

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