Rmax ECOMAXci FR Air Barrier is an energy-efficient thermal insulation board composed of a closed-cell polyisocyanurate (polyiso) foam core bonded to glass fiber reinforced aluminum facers on both sides. Glass fiber reinforcement on both faces of the board offer enhanced durability, dimensional stability and fire performance. The printed side, exposed to the exterior, has a robust embossed 12mil facer with an aluminum reflective surface and clear coating for limited protection against oxidation ensuring jobsite security and enhanced radiant heat protection.