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Curtain Wall Anti Fire Firestop Sealant of Water Based 3m 1000ns. Water Tight & Fire Rated: Meets UL W-Rating for water tightness and UL 1479 firestop tests. Acoustic & Smoke Control: Minimizes noise transfer with STC-Rating of 56 and acts as a smoke seal. Halogen-Free & Paintable: Halogen-free formula, paintable with primer, and compatible with CPVC. OEM/ODM Services: Customization from samples available for global customers. LEED & Code Compliant: Meets LEED VOC regulations, IBC, and key life safety building codes. Trusted 3M Quality: Part of 3M's broad line of affordable, long-lasting fire protection products.