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3M™ Fire Barrier Packing Material PM4

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An easy-to-dispense, non-asbestos, inorganic material 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.
  • Non-combustible material (ASTM E 136)
  • Meets ASTM C 1338 Standard Test Method for Determining Fungi Resistance of Insulation Materials and Facings
  • Approved for use in all UL-listed through penetration 3M firestop systems
  • Easy to transport and carry
  • Convenient, hand-tear dispensing
  • 4" x 20.5 ft