Polystyrene foam is a dense inorganic material that is filled with air during processing to obtain the desired properties of the material. As a result, the material contains 2–4% polystyrene foam and 96–98% air. Available in both bulk and panel form. White polystyrene foam is the best known, but grey with graphite particles is also gaining more and more popularity. One of the most available materials in terms of price. It is most often used for external wall and foundation insulation.
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