A type of plastic that is used to manufacture a wide range of products, from construction materials to storage containers, used according to its users, it is possible to form a dense foam material or an incompressible solid product produced. Production of polystyrene granules that starts with materials imported additions and deforming agent to the extruder. Mixed under controlled conditions of temperature and pressure inside the melting becomes a fluid with high viscosity. The resulting liquid is continuously passed from one format and then exit it becomes spongy