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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.
Physical Properties
| Property | Value |
|---|---|
| Color | Red |
| Density/Weight per Gallon | 10.2 lbs/gal (1.22 kg/L) |
| Solids Content by Weight | 81% |
| Solids Content by Volume | 77.6% |
| Flame Spread | 0* |
| Smoke Development | 20* |
| Coverage | For more information on product coverage see the following documents for Linear Joint & Penetration |
| pH | 7.4 to 8.4 |
| In Service Temperature | Less than 185°F (85°C) |
| Storage Temperature | 40°F (4°C) to 95°F (35°C) |
| Application Temperature | 35°F (2°C) to 100°F (38°C) |
| STC Rating (ASTM E90-04/ASTM C919) | 61 (Relates to Specific Construction) |
| VOC Content | 53 g/L** |
| Expansion Begins | 350°F (176°C) |
| Average Volume Shrinkage (ASTM C1241) | 23.5% |
| Volume Expansion | 5x Free Expansion |
| Shelf Life From Date of Manufacture | 24 months |
*Tested to ASTM E84 (UL723) at 14% surface coverage (modified test for sealants and caulks)
**Per SCAQMD Rule 1168 (EPA Method 24)
