Editing Polystyrene (section)

===Oriented polystyrene===
Oriented polystyrene (OPS) is produced by stretching extruded PS film, improving visibility through the material by reducing haziness and increasing stiffness.  This is often used in packaging where the manufacturer would like the consumer to see the enclosed product.  Some benefits to OPS are that it is less expensive to produce than other clear plastics such as [[polypropylene]] (PP), [[polyethylene terephthalate]] (PET), and high-impact polystyrene (HIPS), and it is less hazy than HIPS or PP. The main disadvantage of OPS is that it is brittle, and will crack or tear easily.