3M™ Fire Barrier Moldable Putty and Endothermic Mat

Moldable firestop putty for electrical outlet boxes and a wide variety of through-penetrations. Used to help prevent the spread of fire, smoke, toxic fumes for up to 4 hours. 3M Interam Endothermic Mat helps retard heat transfer to protect structural steel, cable trays and circuits in conduits. Provides up to 3-hour protection of electrical circuits and up to 4-hour protection of structural steel.