STI Firestop

BlazeStop WF Intumescent Caulk

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BlazeStop® WF300 Intumescent Firestop Caulk is a latex-based firestop caulk designed for residential wood frame construction. WF300 Caulk is tested for addressing penetrations through wood/frame construction such as wood stud walls and floor/ceiling assemblies. Under fire exposure, WF300 expands to up to four times its original volume.
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Manufacturer STI Firestop
Product Sheet (337.40 kB)
Safety Sheet (110.13 kB)
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/UL1479