ELASTOPHENE® Flam FR+ GR (fire retardant, granules) is an SBS-modified bitumen cap ply for use in approved multi-ply membrane and flashing assemblies. ELASTOPHENE Flam FR+ GR is composed of a proprietary formulation of elastomeric styrene-butadiene-styrene (SBS) polymer modified bitumen and is reinforced with high quality random glass fiber mat. The topside is surfaced with ceramic coated granules and the underside is surfaced with polyolefin burn-off film to optimize heat welding.