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Aquastop Smoke Sealant for Construction Joints Firestop Openings 3m 1000ns. 50-Year Shelf Life: Ensures long-term durability and performance for construction joints. Fire and Water Protection: Meets UL 1479 firestop tests and UL W-Rating for water tightness. Smoke Seal Performance: Acts as an effective smoke seal for installations requiring L-Rating. Acoustic Benefits: Minimizes noise transfer with an STC-Rating of up to 56. Paintable and Compatible: Can be painted with primer and is compatible with CPVC piping. Halogen-Free Formula: Safe environmental profile meeting LEED VOC regulations.