SOPRALAST 50 TV ALU Sanded is composed of a proprietary formulation of elastomeric styrene-butadiene styrene polymer modified bitumen and is reinforced with a high strength glass fiber scrim. SOPRALAST 50 TV ALU Sanded is a SBS-modified bitumen cap ply for use in approved multi-ply membrane and flashing assemblies. The topside is surfaced with an aluminum foil and underside is surfaced with fine mineral aggregate to facilitate cold adhesive and hot asphalt applications.