top of page

    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. Its woven construction is less irritating to the skin when compared to conventional mineral wool commonly used in firestop applications. In addition, it is packaged so users can easily transport it to any job location and carry it directly to the application site.


    • Inorganic, non-asbestos material is an excellent alternative to mineral wool, fiberglass or backer rod
    • Mold resistant per ASTM C 1338
    • Easy to use smooth woven material pulls out quickly and tears off by hand without tools
    • Less irritating to skin vs. mineral wool
    • Fully portable for fast, easy installation
    • Approved for use in all UL-listed through penetration 3M firestop systems
    • Inorganic, non-asbestos material ideal for filling around fire protection installations
    • Non-combustible per ASTM E 136 testing


    • Certifications and Listings: No Certifications or Listings
    • Color: Green/Gray
    • Coverage (linear ft.): 0
    • Dry to touch (min.): 0
    • Features: Fire and High Heat Resistant
    • Indoor/Outdoor: Indoor
    • Interior/Exterior: Interior
    • Kit: No
    • Pack Size: 5
    • Paint Tool Product Type: Caulk
    • Standard Color Family: Gray


Related Products