SOPRALENE Flam Stick is a SBS-modified bitumen, self-adhered base ply for use in approved multi-ply membrane and flashing assemblies. The topside is surfaced with polyolefin burn-off film to optimize heat welding and the underside is surfaced with protective polyolefin release film that is removed during application. SOPRALENE Flam Stick is composed of a proprietary formulation of elastomeric styrene-butadiene-styrene (SBS) polymer modified bitumen in combination with a high tack self-adhesive layer and is reinforced with a tough, dimensionally stable non-woven polyester mat.