Polystyrene (PS) plastic is a naturally transparent thermoplastic that is available as both a typical solid plastic as well in the form of a rigid foam material. ... The foam form of polystyrene is used most often as a packing material.

Why is polystyrene a good plastic?

Polystyrene is one of the most widely used kinds of plastic. ... Extruded polystyrene foam has good insulating properties making it important as a non-structural construction material.

What plastic is used in polystyrene?

Polystyrene is a synthetic polymer made from styrene monomer, which is a liquid petrochemical. It is a thermoplastic polymer which softens when heated and can be converted via semi-finished products, such as films and sheets, into a wide range of final articles.