SOPRALENE® 180 PS 2.2 is an SBS-modified bitumen base ply for use in approved multi-ply membrane and flashing assemblies. SOPRALENE 180 PS 2.2 is composed of a proprietary formulation of elastomeric styrene-butadiene-styrene (SBS) polymer modified bitumen and is reinforced with tough, dimensionally stable non-woven polyester mat. The topside is surfaced with polyolefin (P) burn-off film and the underside is surfaced with fine mineral aggregate (S) to facilitate cold adhesive and hot asphalt applications.