ELASTOPHENE SP 2.2 is a SBS-modified bitumen base ply for use in approved multi-ply membrane and flashing assemblies. The topside is surfaced with fine mineral aggregate and underside are surfaced with polyolefin burn-off film to optimize heat welding. ELASTOPHENE SP 2.2 is composed of a proprietary formulation of elastomeric styrene-butadiene-styrene polymer modified bitumen and is reinforced with a high quality random glass fiber mat.