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).