Feature●TESTED AND LISTED: Up to 2-hours in accordance with ASTM E814 (UL 1479) and CAN/ULC S115●TIGHT FIRESTOP SEAL: Pre-formed foam block maintains tight firestop seal to prevent fire, smoke and toxic gas transmission●SUITABLE FOR MEDIUM TO LARGE APPLICATIONS: Fits medium to large openings in wall and floor through-penetrations●NO CURE TIME: Can help complete projects more quickly●PRIMER PAINT READY: Block is paintable with primer●EASY INSTALLATION: Installation requires no special tools●DESIGNED FOR VERSATILITY: Can be repaired and reused as needed, saving time and laborDescription
3M Fire Barrier Block B258 is a pre-formed foam block designed for easy installation to effectively seal larger openings against smoke, toxic gas and flame. It is simple to use and helps reduce sound transmission.