Elastophene Sanded Base Ply Sheet is composed of a proprietary formulation of elastomeric styrene-butadiene-styrene (SBS) polymer modified bitumen and is reinforced with a high quality random glass fiber mat. The topside and underside are surfaced with fine mineral aggregate to facilitate cold adhesive and hot asphalt applications. Elastophene Sanded Base Ply Sheet is a SBS-modified bitumen base ply for use in approved multi-ply membrane and flashing assemblies.