Polystyrene Paper (PSP) is a PS Foam which produced by extruding process as another plastic. Production process start when put polystyrene resin pellets into the extruder that heated by electric. Foaming process occur at the end of extruder where the blowing agent, butane (C4H10) gas react with the melt plastic then become foam. The melted polystyrene foam then extended as sheet then roll as paper roll, that is why commonly known as “Polystyrene Paper”. The polystyrene foam sheet or polystyrene paper can be produced as many shape according to the mold by thermal forming process such as food tray, cups, bow, and food box.