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Home STI BlazeStop WF300 Intumescent Firestop Caulk - 20 oz

STI BlazeStop WF300 Intumescent Firestop Caulk - 20 oz

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About this item

Type WF300 Caulk is a latex based, high solids firestop caulk. This material, when properly installed, effectively seals penetration openings in wood frame construction against the spread of fire, smoke and combustion byproducts. Type WF300 Caulk is a single stage intumescent. When exposed to elevated temperatures, WF300 expands rapidly to seal off voids left by the burning or melting of combustible materials. Type WF300 Caulk is storage stable (when stored according to manufacturer’s recommendations) and will not separate or shrink when dried. WF300 adheres tenaciously to common construction materials such as lumber and gypsum board as well as typical penetrant materials.

  • Water based: Easy installation, cleanup and disposal
  • Intumescent: Expands with heat
  • Water-resistant: Will not re-emulsify
  • Installer friendly, easily applies with standard caulking gun
  • Suitable for combustible and non-combustible penetrants
  • Tested for up to 3 hours of fire exposure when tested to ASTM E814/UL147
  • Paintable

20 oz sausage

Make & Model
Brand ---
Part # ---
Color Family White
Certifications & Standards
TAA/BAA Compliant 1
Packaging Dimensions
Height 7.800

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