SOPRAFIX Base 622 is an styrene-butadiene-styrene modified bitumen base ply for use in approved multi-ply membrane and flashing assemblies and is designed specifically for mechanical attachment to approved substrates. The topside and underside are surfaced with fine mineral aggregate to facilitate subsequent cold adhesive or self adhered application. It is composed of a proprietary formulation of elastomeric styrene-butadiene-styrene polymer modified bitumen and is reinforced with a tough, dimensionally stable non-woven polyester mat engineered for mechanical attachment.