3M Fire Barrier Packing Material

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3M™ Fire Barrier Packing Material, 4 in x 20.5 ft

Our 3M™ Fire Barrier Packing Material PM4 is designed and fully approved as an alternative packing material to mineral wool, fiberglass and backer rod in UL-listed through-penetration 3M firestop systems. Strong, flexible and non-combustible per ASTM E 136, this non-asbestos mold-resistant material is fully portable and can be installed without tools.