Specified Technologies, Inc. -WF300 Intumescent Firestop Caulk

WF300 Intumescent Firestop Caulk

Category: firestop caulks | firestopping sealants | intumescent firestopping...

MasterFormat: Penetration Firestopping | Joint Firestopping | Joint Protection...

Specified Technologies, Inc.
210 Evans Way
Somerville, NJ 08876
Tel: (800) 992-1180
Fax: (908) 526-9623



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WF300 Intumescent Firestop Caulk

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

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Ordering Information
Item #Case Qty. (min)Qty.UPC # 730573DescriptionWeight
WF310121971010.1 oz. Tube (18.2 Cu. In., 300 ml).94 lbs (0.42 kg)
WF305n/a197055 gal. Pail (1155 Cu. In.,19.0 L)58 lbs (26.3 kg)
WF320121972020 oz. Sausage (36 Cu. In., 592 ml)1.59 lbs (0.72 kg)
Physical Properties
Odor:Mild Latex
Density:11.4 lbs/gal (1.36 kg/L)
Solids Content:0.81
pH7.4 to 8.4
Max In Service Temperature120º F (49º C)
Flame Spread0
Smoke Developed20
STC Rating (ASTM E90/ASTM C919)61
VOC Content
(EPA Method 24/ASTM D3960)33.3 lb/gal. (40.0 g/L)
Expansion Begins350º F (176º C)
Volume Expansion:>5X Free Expansion
Shelf Life:2 Years