BOSS - 03642RD10 - 816 Intumescent FireStop Sealant

Item Number: BOSS81610  MFR Part Number: 03642RD10


Intumescent Firestop Sealant
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Boss® 816 UL Classified Intumescent Firestop Sealant Is A Fire Rated, General Purpose Sealant For Use On Through-Penetrations and Construction Joints. It Is A Single Component, Non-Sag, Waterbased Sealant and Smoke Seal That Is Easy To Apply and Clean Up.

Boss® 816 Will Prevent The Spread Of Toxic Gases, Water, Smoke and Fire Through Joint Openings and Through Penetrations. Is Suitable For Adhesion To Almost Any Surface and Remains Flexible, Making It Ideal For Both Horizontal and Vertical Joints, Subject To Vibration or Dynamic Movement. It Bonds Quickly, Has Excellent Adhesion and Is Non-Toxic.

Boss® 816 Is Protected Against Mold Growth with A Combination Of Biocides In Both Wet and Dry Stages.

It Has Been Tested To The Following Specifications:

  • UL 1479 (Astme-814),
  • UL 2079 (Astm E-1966),
  • Astm E-84 (0-Flame, 0-Smoke),
  • Astm E-90 (Stc 53).


  • Bonds Quickly with Excellent Adhesion
  • Mildew Resistant
  • Remains Flexible
  • Voc Compliant
  • Excellent Freeze/Thaw Properties
  • Safe To Use and Handle
  • Water Based and Paintable
  • 12 Month Shelf Life

California residents: see Proposition 65 Warning

Weight1.2 Pounds (Lb)
Width2 Inches (In)
Height8.25 Inches (In)
Country of OriginUSA
Length2 Inches (In)
Service Temperature-20°F to 185°F (-28.8°C to 85°C)
Application Temperature40°F to 110°F (4.4°C to 43.3°C)
CoverageNone specified
Dry Time21-28 DAYS
Flash PointNone specified
Shelf Life1 Year from the date of shipment
Solids Content> 90 %
Storage Temperature35°F to 120°F (1.6°C to 48.8°C)
UV ResistantNo
Tensile StrengthNone specified
Includes4 Inch Nozzle
ApplicationIntumescent Firestop Sealant For Fire-Rated Assemblies. Prevents Spread Of Toxic Gases, Water, Smoke, And Fire Through Joint Openings And Through Penetrations.
Comments/NotesCan Contribute Credits
CompositionFire Stop
Fire Rating1- 3 Hour
For Use Withthrough-penetrations and construction joints
RatingsUL 1479 (ASTM E-814)
Size10.1 Ounce
StandardsUL 1479, ASTM E-814, IBC/IRC, BOCA National building Code, CABO one and two family dwelling code, UBC (1997), and UL Classified
Temperature Range-40°F to 185°F (-40°C to 85°C)
ViscosityNone specified
UL ListedYes
UL RecognizedYes