3M™ Fire Barrier IC 15WB Sealant

Expands in High Temperatures to Seal Out Smoke and Flames


What's special about this sealant?

  • Water Base: Easy clean up, no special handling, routine disposal
  • Intumescent: Expands when heated to maintain seal around items consumed by fire.
  • Endothermic: Absorbs heat energy, releases chemically bound water
  • Thixotropic: Will not sag or run in overhead or vertical applications
  • Click for More Features
  • UL Classified

3M™ Fire Barrier IC 15WB Sealant is a latex sealant designed for use as a one-part fire, smoke, noxious gas and water sealant.

Please Note: These products ship in 5 Business days

Part # Package Size Description Price
FP-3M-IC15WB-T 10.1 oz Tube Lightweight easy to handle. Perfect for smaller jobs.
Quick Ship
FP-3M-IC15WB-P 4.5 gallon Pail Great for bulk loading on large jobs. The most cost-effective way to caulk large areas.
Manufacturer Direct

The unique intumescent property of this material (expands when heated) means that as the noncombustible pipe, cable or pipe insulation is consumed by fire, sealant expands to maintain the penetration seal.

  • Halogen-free
  • Fast dry: Tack-free in approximately 8 to 12 minutes @ 73°F (23°C)
  • Paintable. Best results obtained after 72 hour cure
  • Minimal shrinkage
  • Yellow color
  • Water seal: Seals against inadvertent water spills in the unexpanded state
  • High sealant rate: 2000 g/min. with 1/4 in. (6 mm) nozzle
  • Point contact allowed
  • Continuous Operating Temperature not to exceed 120°F (48°C)

  • IC 15WB Sealant features superior adhesion strength, sealant rate and no-sag application with UL Classified fire protection systems plus a halogen-free formula.

    3M™ Fire Barrier IC 15WB Sealant can be installed with a standard caulking gun, pneumatic pumping equipment or it can be easily applied with a putty knife or trowel.
    Sealant bonds to gypsum wallboard, concrete, metals, wood and cable jacketing. No mixing is required. Tool within 5 minutes of application, if required.

    The firestopping sealant shall be a one-part, intumescent, latex elastomer. The sealant shall be capable of expanding a minimum of 2 times at 1000F. The material shall be thixotropic and be applicable to overhead, vertical and horizontal firestops. The sealant shall be listed by independent test agencies such as UL, FM or OPL and be tested to, and pass the criteria of, ASTM E 814 Fire Test, tested under positive pressure.

  • IC 15WB Data Sheet (PDF) PDF

    Calcium Carbonate 30 - 60
    Polymer 10 - 30
    Water 10 - 30
    ZINC BORATE 3 - 7
    Sodium Silicate 3 - 7
    Fiberglass 0.5 - 1.5

    Typically Specified Divisions

    Division 7
    Thermal and Moisture Protection



    A. Typical Physical Properties

    Tack Free Time (ASTM C679-87): 8 to 12 minutes @73OF (23OC)
    Expansion at 662O F (350OC): 2.0
    Color: Yellow
    Density: 12.0 lb./gal. (1,43 kg/L)
    Adhesion: Very good on all construction substrates
    Application: Caulk guns, trowel, spatula, pressurized pumps
    Durometer: (hardness) Shore A: 70
    Solids: 80% by weight
    VOC: 0
    Odor: Pleasant non-irritating
    Flow Rate:
        ASTM E 84: Flame Spread:
        Smoke Development:
    2000 grams/min. from 1/4 in. (6,35 mm) nozzle at 50 psi
    Boeing Flow (Sag Characteristics): <2 in. (5,08 cm)

    B. Firestopping Properties
    Meets the criteria of ASTM E 814 Fire Test, tested under positive pressure. Consult current UL Fire Resistance Directory for systems listed under 3M Product Caulk. IC 15WB Caulk also meets ASTM E 84 (UL 723) and ASTM E 1966 (UL 2079).




    Related Articles


    How-To Corner



    If it's yellow and 3M, it's UL-tested:

    It's not safe to assume that because a firestop caulk is red, it has been UL-tested for your applications. 3M offers the yellow firestop caulk that has been UL-tested to ASTM E 814 for the most common applications.

    3M Fire Barrier IC 15WB Caulk is an affordable firestop caulk that helps you stay on budget. Our distinctive yellow firestop caulk makes inspections easier. Plus, our fire barrier sealant provides protection around typical pipe and cable penetrations through fire-rated construction.

    fire barrier applied to cables through concrete

    Cables through concrete

    fire barrier sealant protecting multiple metal pipes

    Multiple metal through floor/ceiling

    Conduit through gypsum

    Conduit through gypsum

    Insulated pipe through concrete

    Insulated pipe through concrete


    Installation Techniques:


    cross section of pipe through concrete floor
    cross section of insulated cable through concrete wall
    cross section of insulated pipe through concrete floor


    Shown are examples of approved applications of IC 15WB Sealant. Additional drawings and details are available through your Authorized 3M Fire Protection Products Distributor.

    Installation Notes:
    1. Metal Pipe/Conduit applications through nominal 10.75 in. (273,0 mm) outside diameter.
      • Installed depth of IC 15WB Sealant 1/2 in. (12,7 mm).
      • Refer to appropriate system for annular space requirement.
      • Minimum 4 pcf mineral wool for backing.
    2. Insulated Cable Applications.
      • A 1/2 in. (12,7 mm) minimum depth of IC 15WB Sealant.
      • All cases require mineral wool (safing) for packing.
    3. Fiberglass Insulated Pipe Applications
      • Refer to appropriate system for insulation thicknesses, annular space, mineral wool and sealant application.

    3M Fire Barrier IC 15WB Sealant is stable under normal storage conditions and has a one year shelf life. Normal stock and stock rotation are recommended.
    Store between 40OF (4OC) and 90OF (32OC) for maximum shelf life.
    Keep from freezing during storage.

    Warranty and Limited Remedy:

    This product will be free from defects in material and manufacture for a period of ninety (90) days from date of purchase. 3M MAKES NO OTHER WARRANTIES INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
    User is responsible for determining whether the 3M product is fit for a particular purpose and suitable for user’s method of application. If this 3M product is proved to be defective within the warranty period stated above, your exclusive remedy and 3M’s sole obligation shall be, at 3M’s option, to replace or repair the 3M product or refund the purchase price of the 3M product.

    Limitation of Liability:

    Except where prohibited by law, 3M will not be liable for any loss or damage arising from the use of this 3M product, whether direct, indirect, special, incidental or consequential, regardless of the legal theory asserted, including warranty, contract, negligence or strict liability.

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    Questions & Answers


    Is this a good choice to use on joints and seams around outdoor built in grill station.

    Asked by Anonymous user on 11.08 AM Tuesday, 07 March, 2017

    • - Hello, The 3M Fire Barrier IC 15WB Sealant has a continuous operating temperature of 120F (48C)so as long as the area that you are sealing does not exceed this temperature, then this will be a great product. However, if the area that you are sealing has a continuous operation temperature above that, we do offer other products with a higher temperature rating. Please give us a call at 866-222-0030 and we can discuss those other options and find the one that will best work for your application. Thank you,

      andrew b. on 12.15 PM Tuesday, 14 March, 2017

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