What is an APET membrane

APET Material Overview

I. Basic Concepts

APET (Amorphous Polyethylene Terephthalate), also known as polyester rigid film, is a thermoforming material classified as a thermoplastic eco-friendly plastic. Its production scraps and waste are fully recyclable. With a chemical composition identical to paper (carbon, hydrogen, and oxygen), APET is a biodegradable plastic, making it a sustainable choice for modern industries.

II. Characteristics and Advantages

Environmental Benefits

• Non-toxic & Odorless: Meets hygiene standards for food contact.
• Eco-Safe Disposal: Unlike PVC, APET produces no secondary pollutants during incineration.

Physical Properties

1. Lightweight:
   • Specific gravity: 1.33 (3.7% lower than PVC’s 1.38).
2. High Strength:
   • 20% stronger than PVC film.
   • Withstands -40°C without brittleness, allowing 10% thinner film to replace PVC.
3. Superior Fold Resistance:
   • No self-cracking or creasing, ideal for decorative surfaces (e.g., document covers).
4. Optical Clarity:
   • Higher transparency and gloss compared to PVC’s bluish tint, perfect for premium packaging.

Chemical Resistance

• Resists corrosion from most chemicals, ensuring durability in harsh environments.

Thermal Shrinkage

• Heat-Shrink Polyester Film:
  • Stable at room temperature but shrinks ≥50% unidirectionally when heated above its glass transition temperature (Tg).
  • Ideal for shrink sleeves, labels, and tight-seal packaging.

III. Applications

1. Packaging Materials

• Industries: Cosmetics, food, electronics, toys, printing.
• Products:
  • High-end blister packaging, foldable boxes, plastic tubes, window panels.

2. Pharmaceutical Packaging

• Key Features:
  • High transparency, gloss, and mechanical strength.
  • Exceptional barrier properties: Blocks oxygen, moisture, and contaminants, extending drug shelf life.

3. Other Applications

• Construction: Waterproof membranes and thermal insulation materials for enhanced building safety.