This work discusses the process of making styrofoam (EPS) in the company Limmont d.o.o. from Vrbanovec. First are explains the definition, a way of getting and short history of polystyrene. Then expanding the PS, its technical characteristics and properties of conductivity, the advantages and disadvantages of Styrofoam as the type of material used for thermal isolation. In the practical part of the work is described a process of producing Styrofoam in company Lim-mont d.o.o. from Vrbanovec. Production of polystyrene is carried out in eight stages: Stage 1: Storage of raw materials for expansion, Stage 2: Expansion of balls Syrians F900SR, Stage 3: Protection of styrofoam in the vapor-permeable silos, Stage 4: Expansion of Styrofoam into a block form, Stage 5: Storage block form, Stage 6: Processing block form, Stage 7: Quality control and Stage 8: Storage of the finished product. The procedure of the production stages is described in detail, with pictures from the production process (material, machines,...) and the accompanying lists of controling the product in production process. At the end of the work there are described machines used in the production of Styrofoam and maintenance tools.