SilveRboard® Graphite XS (SBGXS), a new higher performing rigid foam Insulation, is an expanded polystyrene (EPS) base material that embeds carbon “graphite” particles which increases the thermal performance of the EPS insulation. The graphite EPS beads reflect radiant heat energy similar to the effect of a mirror and increases the materials ability to resist the flow of heat or R value. SilveRboard® Graphite XS is a cost effective & higher performing Insulated Exterior Wall Sheathing compared to Extruded Polystyrene (XPS).