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"Styro-oam" extruded plastic foam is formed into billets that <br />are used for floating docks around the country, as well as on <br />both coasts. "Styrofoam" does not absorb water, because it <br />is extruded with a closed cell structure. The molded <br />polystyrene foam does absorb water between the expanded <br />beads. - - — • • . ......