Polystyrene (PS)

Polystyrene (PS) is a synthetic aromatic polymer made from the monomer styrene. Polystyrene can be solid or foamed. General purpose polystyrene is clear, hard, and rather brittle. It is an inexpensive resin per unit weight.  Polystyrene is one of the most widely used plastics, the scale of its production being several billion kilograms per year.