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Bostik 915FS (White) is a one-component, contractor construction grade, smooth fast setting polyurethane sealant capable of dynamic joint movement totaling 70% of original joint geometry (±35%). Bostik 915FS meets ASTM C920, Type S, Grade NS, Class 35, Use NT, A and M; U.S. Federal Specification TT-S-00230C, Class A, non-sag. Key applications include pre-cast concrete panels, for use under deck coatings, for sealing various roofing and siding applications and for sealing perimeters of doors, windows, and other wall penetrations.