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How is EPS made?

EPS beads are formed by steam-heating small amounts of pentane gas dissolved in the polystyrene base material during production. The gas expands under the steam, to form perfectly closed cells of EPS. These cells occupy 40 to 60 times the volume of the original polystyrene bead. The EPS beads are then moulded into appropriate forms suited to their application such as insulation boards, blocks or customised shapes for the building and packaging industry.
Video explaining production of EPS