STI WF310 Intumescent Firestop Sealant for Wood Frame (10oz Tube)


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.

  • 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


Physical Properties
Color: Red
Odor: Mild Latex
Density: 11.4 lbs/gal (1.36 kg/L)
Solids Content: 0.81
pH 7.4 to 8.4
Max In Service Temperature 120º F (49º C)
Flame Spread 0*
Smoke Developed 20*
STC Rating (ASTM E90/ASTM C919) 61
VOC Content
(EPA Method 24/ASTM D3960) 33.3 lb/gal. (40.0 g/L)
Expansion Begins 350º F (176º C)
Volume Expansion: >5X Free Expansion
Shelf Life: 2 Years
Weight 2 lbs
Dimensions 2 × 2 × 10 in

SKU: WF310 Category: Tags: , , , , Barcode: 730573097106.
Weight 2 lbs
Dimensions 2 × 2 × 10 in