Despite what many people think, that white, porous foam you may be familiar with is not Styrofoam. Styrofoam, also referred to as Blue Board, is the trademarked brand name of an insulation product manufactured by Dow Chemicals. It consists of closed-cell extruded polystyrene foam (XPS) and is made of styrene. The styrene is then refined into polystyrene and a hydrofluorocarbon addition is made. After an expansion process, the Styrofoam board is ready for installation.