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Metacaulk® 150+ Firestop Sealant is a one-component, water-based elastomeric firestop caulk designed to help prevent the spread of fire, smoke, and hot gases through construction joints and penetration openings. This listing includes a full case of twelve 10.3-ounce red cartridges, making it ideal for contractors, facility maintenance teams, and commercial construction projects requiring consistent fire-rated sealing performance. Formulated for easy application with standard caulking guns, Metacaulk® 150+ is a non-sag, paintable sealant that cures to a flexible elastomeric seal capable of accommodating joint movement. It is commonly used in interior wall and floor assemblies including gypsum partitions, concrete walls, block construction, and floor/ceiling assemblies where firestop integrity is critical. The product is also suitable for sealing penetrations such as conduit, power cables, telecom lines, and similar service openings. Tested firestop systems using this sealant can achieve ratings of up to four hours, helping maintain fire barrier integrity while also delivering acoustic sealing performance with an STC rating of 65. Its low VOC (<10 g/L), water-based formulation supports safer indoor application with minimal odor and easy cleanup.