VARPOR EPS is expanded polystyrene which is produced from polystyrene granules, impregnated with pentane. The production procedure is executed in three separate stages. During the first stage, granules are briefly heated by steam, pre-expanding, increasing their volume 20-40 times, depending on the desired pouring density (12-30 kg/m3). Pre-expanded granules are transported to storage silos, where they are left to stabilize for 12-24 hours. During the third stage, stabilized granules are dosed in block-form, in which the dry saturated steam is used to achieve the final expansion; the granules fill the entire volume of the mould and are glued to one another, forming a compact closed-cell material. The blocks are removed from the moulds and, following stabilization, are cut by hot wire.
Varpor EPS has a closed-cell structure (98% of air and 3-6 million of closed cells in 1 m3), which results in very low water absorption, relatively high resistance to water vapour diffusion and low thermal conductivity. It is amorphous in structure and does not change its basic structure in temperatures up to -180 °C, and it’s permanently resistant in temperatures up to + 75 °C, and briefly in temperatures up to + 90 °C.
From the environmental protection standpoint, Varpor EPS is the most acceptable polymeric material because when used as a thermal insulator, it significantly contributes to saving heating and cooling energy and significantly reduces the content of carbon dioxide in the atmosphere, the main cause of glasshouse effect. Varpor EPS contains no fluorine chlorinated hydrocarbons that deplete the ozone layer, nor softeners and it does not degrade groundwater. Varpor EPS ground waste, generated during block cutting process is completely recycled as regenerate, which is added in a small percentage during the production of blocks, meaning that the Varpor EPS production process leaves no waste.
It is an excellent thermal insulator, and a flame retardant according DIN 4102 class B1, it has good mechanical properties and is easily installed. The increase of bulk density results in the increase of compressive strength at 10% compressibility.
Varpor EPS F (facade), applied in compact façade heating systems, is produced without regenerate and stabilized, and is also made with an overflap. The most important mechanical property for Varpor EPS F is the tensile strength.
Therefore, Varpor of lower bulk densities (Varpor EPS 50, 60, 70) is applied as thermal insulation where there are no special requirements for compressive strength (in sloping roofs, fillings, exterior brick walls, interior walls, massive sloping roofs …).
Varpor EPS of higher bulk densities (Varpor EPS 80, 90,100,120,150,200) is applied as thermal insulation for floors, in pitched roofs, flat roofs of large and medium load.
Elasticated Varpor EPS T is applied to damp the impact sound in floating floors constructions. It can be applied in dilatation grids.
Depending on the thickness of the Varpor EPS insulating boards and climate conditions, energy savings of 60% and more are achieved in heating during winter and cooling during summer.