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3M 3' x 3' Fire Barrier Composite Sheet

Brand: 3M Mfg#: 98040024089
Product#: 479CS19536
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A thin one-part composite system designed to firestop blank openings and larger penetrations such as cable trays and conduit and HVAC ductwork through rated construction


  • Easy to install using common trade tools
  • Cut and form to desired shape
  • Thermally conductive allows unwanted heat build up to escape
  • Non-flame supporting
  • Firestop tested for up to 4 hr in accordance with ASTM E 814 (UL 1479)
  • Re-enterable for new or retrofit installations
  • Intumesces (expands with heat) to form a hard char that tightly seals penetrations against flame spread, smoke and toxic gases


  • Brand: 3M
  • Fire Rating: 4 hr
  • Mounting: Wall/Floor
  • Material: Steel
  • Standards: UL Listed, FM Approved
  • Length: 36 ft
  • Width: 36 in
  • Special Features: 0.3 in Thickness, Cover with Aluminum Foil
  • Usage: For Shield Cable Trays and Conduit, HVAC Ductwork and Vital Process Equipment