SOPRALENE 250 FR GR (fire retardant, granulated) is a SBS-modified bitumen cap ply for use in approved multi-ply membrane & flashing assemblies. SOPRALENE 250 FR GR is composed of a proprietary formulation of elastomeric styrene butadiene-styrene (SBS) polymer modified bitumen and is reinforced with a tough. The topside is surfaced with ceramic coated granules and the underside is surfaced with fine mineral aggregate to facilitate cold adhesive and hot asphalt applications.