Polystyrene (PS) Plastic

Polystyrene (PS) Plastic

PS is a versatile plastic that can be rigid or foamed. Pure polystyrene is a colorless, hard plastic with limited flexibility, and has a relatively low melting point. Typical applications include protective packaging, food service packaging, bottles, and food containers.


  • Clarity – mostly colored opaque (can be clear)
  • Versatility – can be rigid or foamed
  • Strength – significant stiffness in both foamed and rigid forms
  • Excellent moisture barrier for short shelf-life products
  • Low thermal conductivity and exceptional insulation properties in foamed form
  • Ease of forming – medium soft (some cracking)
  • Longer heat cycle
  • Some shrink issues
  • High yield

Common Forms:

  • Disposable food containers like hinged takeout containers (clamshells), meat and poultry containers, and rigid food containers
  • Food service applications: cups, plates, bowls, and cutlery
  • Compact disc jackets
  • Egg cartons
  • Aspirin bottles