ELASTOPHENE® Flam HR 3.0 (high resistance) is an SBS-modified bitumen base ply for use in approved multi-ply membrane and flashing assemblies. ELASTOPHENE Flam HR 3.0 is composed of a proprietary formulation of elastomeric styrene-butadiene-styrene (SBS) polymer modified bitumen and is reinforced with high performance glass scrim. The topside and underside are surfaced with polyolefin burn-off film to optimize heat welding.