What is the difference between PET and PVC film?

PET (Polyethylene Terephthalate) and PVC (Polyvinyl Chloride) films are both widely used plastic films, but they differ significantly in material properties, applications, and environmental impact. Here’s a detailed comparison:

1. Material Composition & Structure

• PET Film

  • Made from polyester (PET), a thermoplastic polymer.

  • High crystallinity, strong molecular bonds.

  • Free from chlorine or plasticizers (unless modified).

• PVC Film

  • Made from polyvinyl chloride (PVC), a synthetic plastic polymer.

  • Often contains plasticizers (e.g., phthalates) to improve flexibility.

  • Contains chlorine (about 57% by weight), which can release toxic fumes when burned.

2. Key Properties Comparison

3. Common Applications

PET Film Uses

• Packaging: Food trays, blister packs, transparent boxes.

• Electronics: Flexible circuits, LCD screens, insulation films.

• Industrial: Release liners, labels, solar panels.

• Printing: High-quality graphic films.

PVC Film Uses

• Signage & Banners: Flexible, printable, cost-effective.

• Construction: Window films, flooring, waterproof membranes.

• Medical: IV bags, blood bags (rigid PVC).

• Consumer Goods: Shrink wraps, cling films, fake leather.

4. Environmental & Safety Concerns

• PET Film:

  • Recyclable (widely accepted in recycling programs).

  • Does not release toxic fumes when burned.

  • Considered food-safe (BPA-free).

• PVC Film:

  • Difficult to recycle due to chlorine content.

  • Plasticizers (e.g., phthalates) can leach out, posing health risks.

  • Releases dioxins (toxic) when burned.

  • Banned in some eco-conscious applications.

5. Cost & Availability

• PET Film: Generally more expensive but offers better performance.

• PVC Film: Cheaper, widely used in low-cost flexible applications.

Summary: Which to Choose?

• Choose PET if you need durability, clarity, heat resistance, or eco-friendliness (e.g., food packaging, electronics).

• Choose PVC if you need low-cost flexibility and don’t require high temperature/chemical resistance (e.g., banners, inflatable products).