LinacouSTIC® RC-IG insulation is a premium, flexible, fiberglass duct liner madefrom strong glass fibers bonded with a thermosetting resin. The airstream surface is protected with JM's exclusive Reinforced Coating System, which combines ourstate of the art Permacote® acrylic coating with a flexible glass mat reinforcementto provide a smooth air stream surface. On the opposite side of the airstreamsurface, LinacouSTIC RC-IG contains InsulGrip® a non-toxic, water-reactivated adhesive layer.