SpecSeal WF300 Intumescent Firestop Caulk
Firestop 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.
Installer friendly = easily applies with standard caulking gun
Intumescent: expands in all directions = a tough, tight seal
Resistant to water = will not re-emulsify after drying
UL certified = listed in over 80 UL® tested Firestop systems! when tested to ASTM E814/UL1479 = up to 3 hours of fire exposure