From refrigerators and air conditioners, to ovens and microwaves, from hand-held vacuum cleaners to blenders, polystyrene resins meet almost all end-product requirements. Polystyrene resins are safe and cost effective, with excellent appearance and functionality mainly due to easy-processing. Because of this almost 26 percent of the polystyrene demand is used in injection-molding, extrusion and thermoforming applications.