Sealant; Type Water Based, Synthetic Latex, Solid; Container Type Pail; Container Capacity 1 Gallon; Color Gray; Setting Time 48 Hour; Pressure Rating 10 Inch WG; Temperature Rating 35 to 110 Deg F; Application Metal Duct, Fiberglass Ductboard, Duct Fabric, Flex Duct, Flexible Tubing Runout, Indoor/Outdoor, HVAC System; Applicable Standard UL (Canada and US), NSF/ANSI 61, USDA, FDA, EPA; Lead-Free; Odor Slight, Ammonia; pH Value 8.4 to 9.5; Density 1.34 to 1.41 (Relative); Boiling Point 212 Deg F; Evaporation Rate 28 to 32 Percent VolatileDuct-Seal 321 is an all-purpose industrial-grade duct sealant for all types of metal duct, ? berglass duct board, duct fabric and ? ex duct. It includes UV inhibitors for extended outdoor exposure and built-in ? ber reinforcement for added strength. This non-toxic water-based product is solvent free and is suitable for residential use.