Graphite polystyrene foam insulation board delivers maximum energy efficiency, cost effectiveness and sustainability. Architects, contractors and builder-owners benefit from it because of the special advantages this material offers. It is comprised of many small pockets of air within a polymer matrix containing graphite. The graphite reflects radiant heat energy like a mirror, increasing the material's resistance to the flow of heat, or R-value. Most polymer-based foams exhibit a greater ability to slow the movement of heat as the temperature decreases.