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3M Fire Barrier Putty Stick

Brand: 3M Mfg#: 98040054177
Product#: 479MPS2
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A one-part, ready-to-use, re-enterable, intumescent putty that can be easily formed to firestop through penetrations and blank openings in fire-rated assemblies.


  • Provides draft and cold smoke seal
  • Firestop tested up to 4 hr in accordance with ASTM E 814 (UL 1479) and CAN/ULC S115
  • Helps reduce noise transfer (STC Rating of 56 when tested in STC 56 rated wall assembly)
  • Will not dry out or crumble
  • Pliable and conformable (molds easily into required shapes)
  • Noncorrosive to metal and compatible with synthetic cable jackets


  • Brand: 3M
  • Standards: ASTM E 814, UL 1479
  • Thickness: .1 in
  • Color: Dark Red
  • Length: 11 in
  • Width: 1.4 in
  • Usage: For Construction Gaps, Cable, Insulated Pipe, Electrical Conduit, Metal Pipe, Metallic and Non-Metallic Electrical Boxes, Building Maintenance Applications