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Product variation and calculation of averages The insulation board is provided in several dimensions and thicknesses. Please use the conversion table below for other sizes than the declared unit. No variation between sites; single production site declared. Product description Expanded polystyrene (EPS) is a common material used for thermal insulation of buildings, including floors, walls and ceilings. It is a polymer foam, consisting of air-filled polystyrene cells. As 98% of the material is air, EPS provides good insulating properties at a low weight. Other characteristics of the material include low moisture absorption, long service life and high compressive strength.