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An important ingredient of our sandwich panels is Dow XPS foam. The plates we use are made of blue extruded polystyrene hard-foam. These have a high thermical resistance and the right compressive strength for delivering durable performances. Thanks to the closed cell structure this foam is practical moisture insensitive and has a lot of unique properties. It delivers a high insulation performance, can practically not be effected by rain, snow, frost and steam vapour. So it is the perfect solution.