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STI SpecSeal WF320 Fire Barrier BlazeStop WF Intumescent Caulk 20oz Sausage
SpecSeal WF320 BlazeStop is a red latex intumescent firestop caulk in a 20 oz sausage for wood-frame walls and floor-ceilings. It expands to close voids left by burning combustibles so crews can seal longer plumbing, electrical, and mechanical runs.
- Seals through penetrations and gaps in rated wood stud walls and floor-ceiling assemblies.
- Keeps longer wood-frame runs moving with a 20 oz sausage of the same WF300 chemistry.
- Bonds to lumber, gypsum board, and common penetrants for a lasting wood-frame fill.
$13.16
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SpecSeal WF320 BlazeStop Intumescent Caulk - 20 Oz Sausage
SpecSeal WF320 BlazeStop is a red latex intumescent firestop caulk in a 20 oz sausage for wood-frame walls and floor-ceilings. The single-stage WF300 chemistry bonds to lumber, gypsum, and common penetrants, tools into a smoke-tight fill on plumbing, electrical, and mechanical openings, cleans up with water, and stays water resistant after dry on site.
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Key Features
- WF320 is the 20 oz sausage of red WF300 BlazeStop intumescent caulk for wood-frame walls and floor-ceilings.
- Expands as a single-stage intumescent to close voids left when combustibles burn or melt out of the opening.
- Keeps longer wood-frame runs moving with more volume per load than a 10.1 oz cartridge.
- Bonds to lumber, gypsum board, and common penetrant materials so the wood-frame seal stays put.
- Seals smoke as well as fire so the opening stays a smoke barrier after tool-off.
- Stays water resistant after dry and will not re-emulsify if the assembly later gets damp.
- Cleans up with water as a water-based red latex and can be painted when dry.
Technical Specifications
| Property | Value |
|---|---|
| Catalog number | WF320 |
| UPC | 730573097205 |
| Packaging | 20 oz sausage, 36 cu in (592 ml) |
| Color | Red |
| Chemistry | Water-based single-stage intumescent latex |
| Volume expansion | 5x free expansion |
| Expansion begins | 350°F (176°C) |
| Application temperature | 35°F to 100°F (2°C to 38°C) |
| In-service temperature | Less than 185°F (85°C) |
| Shelf life | 24 months from date of manufacture |
Product documents: SpecSeal WF300 Intumescent Firestop Caulk Product Data Sheet
Frequently Asked Questions
What wood-frame openings is SpecSeal WF320 made to seal?
SpecSeal WF320 BlazeStop is the 20 oz sausage of WF300 intumescent firestop caulk for through penetrations and gaps in fire-resistance-rated wood frame construction such as floor/ceilings and walls or partitions. Most common penetrating items were successfully tested with WF300. Typical service work includes plumbing, electrical, and mechanical openings through wood stud walls and wood floor-ceiling assemblies.
When should a crew pick the 20 oz WF sausage instead of the cartridge?
Choose SpecSeal WF320 for longer wood-frame firestop runs that finish faster from a 20 oz sausage (592 ml / 36 cu in) than from 10.1 oz tubes. The live sister cartridge is SpecSeal WF310. A 5 gallon pail (WF305) appears on the WF300 PDS and is not currently live on Indcon. Chemistry matches the 10.1 oz cartridge.
How should unused WF320 be stored, and how long does it keep?
Store between 40 F and 95 F (4 C to 35 C). Shelf life is 24 months from the date of manufacture when stored per the manufacturer. WF300 is storage stable and will not separate or shrink when dried if applied per the recommendations. Inspect rated barriers periodically and reseal damage with WF300 per the original approved design.
Which construction ratings does the WF300 sausage support?
WF300 is the basis for systems that meet ASTM E814 (UL1479) and CAN/ULC-S115 as well as the time/temperature requirements of ASTM E119 (ANSI/UL263). UL systems have been tested for wood frame construction and common penetrating items with ratings up to 2 hours. Class A flame spread and smoke development are 0 / 20 when tested to ASTM E84 (UL723) at 14 percent surface coverage. Follow the published design for the assembly.
What expansion does the Indcon WF amfile publish for WF320?
Free expansion is up to 5 times original volume. Expansion begins at 350 F (176 C). Average volume shrinkage is 23.5 percent (ASTM C1241). VOC content on the preferred Indcon amfile (ZSFOD5085 25262) is 28 g/L per SCAQMD Rule 1168 (EPA Method 24); an older STI web PDS listed 53 g/L. STC is 61 on a specific construction (ASTM E90-04 / ASTM C919).
What safety limit applies while SpecSeal WF320 is still wet?
The PDS states the product contains water and is conductive until dry. Do not apply in the presence of exposed or energized electrical conductors. After dry it is water resistant and will not re-emulsify. Consult the pipe, tubing, or cable maker for known sensitivities; STI does not guarantee compatibility with every plastic, even though the formula is designed to be safe with plastics and is FBC System Compatible.
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