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Semstone Fabric 100 is a non-woven geotextile made from polypropylene fibers. The polypropylene fibers are essentially chemically and biologically inert which offers good chemical resistance to acids, alkalis, oils and most solvents. When saturated with either SEMSTONE 805 or SEMSTONE 806 the result is a chemically resistant, flexible, reinforced membrane system well suited for sealing expansion joints or bridging working cracks in concrete.