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Thermal insulation made of cellular glass. Our product is totally sealed against water vapour and absorbs no humidity. It is entirely fireproof (M0). It does not burn or produce toxic gases. "POLYDROS" cellular glass plates are made by the fusion of vitreous powder in which a thermal-chemical process in the glass powder creates cells in a state of partial vacuum and sealed off from each other. "POLYDROS" cellular glass is a material of maximum quality, with hard-to-beat[...]