Ready-to-use, gun-grade latex-based elastomeric fire barrier sealant from 3M that cures upon exposure to the atmosphere to form a monolithic flexible firestop seal. When properly installed, 3M Fire Barrier Sealant FD 150 provides up to 4-hour fire protection in tested and listed systems. Firestops construction joints and through penetrations. Available in blue, red or limestone, no mixing required, ± 19% movement capability.