3M™ Fire Barrier Packing Material PM4 is designed to be used as an alternative packing material to mineral wool, fiberglass and backer rod in through penetration firestop systems. With excellent strength
and flexibility characteristics, it is an ideal through penetration packing material.
3M™ Fire Barrier Packing Material PM4 is an asbestos-free, inorganic material that is mold and fungi resistant when tested in accordance with ASTM C 1338. This installation friendly material is easy to dispense and its compact packaging is optimized for portability. The smooth textured woven material can be torn by hand, eliminating the need for a knife.