Polystyrene, also known as PS, has been mass-produced since 1930.
-	It is a thermoplastic polymer.
-	Applications: Used for inexpensive packaging materials, pens, safety razors, flatware, and CD jewel boxes. In Styrofoam format, PS is used to make high-throughput, thin-walled, easy-to-mold parts where structure is not paramount.
-	General properties: A material not structurally strong but easy to mold, it is inexpensive, machines well, and possesses excellent transparency.
-	Trade Name: Novacor 555.