Panel Core extruded polystyrene (XPS) foam insulation is a Styrofoam™ Brand closed-cell high performance core material used extensively in composite panel applications. DuPont’s proprietary extrusion process enables precise control of parameters such as density, cell size and cell orientation. This yields foam boards that can stand up to the most demanding composite panel applications. Panel Core is supplied in sheets that have been carefully engineered and planed to precise tolerances for an exceptional bonding surface. The closed-cell structure of Styrofoam™ Brand solutions resists absorption of water, which helps maintain panel integrity and insulating properties in low temperature applications and other environments with high humidity and moisture conditions. The foam also resists absorption of adhesives, so less glue is required for effective, long-lasting adhesion of facer materials.