Properties PET (Polyethylene Terephthalate) PP (Polypropylene) Flexural strength (MPa) ​2,400 - 4,100 1,000 - 1,800 Weight ratio (g/cm3) 1.38 0.91 Transparency Excellent Good Barrier properties Good oxygen and carbon dioxide barrier Poor barrier properties Chemical resistance Good resistance to acids and bases Good resistance to solvents and chemicals Electronic insulation low dielectric constant and low dissipation factor low dielectric constant and High dissipation factor

Sustainability is becoming increasingly important for the film industry as the market alike seek to reduce their environmental impact. The use of post-consumer recycled (PCR) content is a key way to improve the sustainability of film products. However, it's important to ensure that PCR content is used in a way that maintains the quality and safety of the product. This is where the Underwriters Laboratories (UL) 2809 standard comes in.