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STI SpecSeal WF310 Fire Barrier BlazeStop WF Intumescent Caulk 10oz Cartridge
SpecSeal WF310 BlazeStop is a red latex intumescent firestop caulk in a 10.1 oz cartridge for wood-frame walls and floor-ceilings. It expands to close voids left by burning combustibles so crews can seal plumbing, electrical, and mechanical openings.
- Seals through penetrations and gaps in rated wood stud walls and floor-ceiling assemblies.
- Bonds to lumber, gypsum board, and common penetrant materials for a lasting wood-frame fill.
- Cleans up with water as a water-based latex and stays water resistant after dry.
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SpecSeal WF310 BlazeStop Intumescent Caulk - 10.1 Oz
SpecSeal WF310 BlazeStop is a red latex intumescent firestop caulk in a 10.1 oz cartridge 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.
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Key Features
- WF310 is the 10.1 oz cartridge 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.
- 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.
- Pairs with rated wood-frame designs for plumbing, electrical, and mechanical penetrations when the published system calls for WF300.
Technical Specifications
| Property | Value |
|---|---|
| Catalog number | WF310 |
| UPC | 730573097106 |
| Packaging | 10.1 oz tube, 18.2 cu in (300 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
Where does SpecSeal WF310 belong on a wood-frame firestop job?
SpecSeal WF310 BlazeStop is the 10.1 oz cartridge 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.
How do crews apply the 10.1 oz WF310 cartridge?
WF300 is a latex-based, high-solids, single-component caulk applied from a standard 10.1 oz cartridge. Application temperature is 35 F to 100 F (2 C to 38 C). Wear site PPE and follow the Safety Data Sheet. Product contains water and is conductive until dry, so do not apply in the presence of exposed or energized electrical conductors.
Which WF pack should a crew choose for cartridge work?
Choose SpecSeal WF310 when the job needs the 10.1 oz tube (300 ml / 18.2 cu in). The live sister sausage is SpecSeal WF320. The WF300 PDS also shows a 5 gallon pail (WF305); that size is not currently live on Indcon. Chemistry is the same red single-stage intumescent latex across those catalog numbers.
What happens to WF310 when fire hits the caulk?
WF300 is a single-stage intumescent. When exposed to elevated temperatures it expands rapidly to seal off voids left by the burning or melting of combustible materials. Free expansion is up to 5 times original volume, and expansion begins at 350 F (176 C) per the Indcon amfile PDS (ZSFOD5085 25262). WF300 is the basis for systems tested to ASTM E814 (UL1479) and CAN/ULC-S115 with wood-frame ratings up to 2 hours. Follow the published design.
What temperature window can crews apply and then leave WF310 in service?
Application temperature is 35 F to 100 F (2 C to 38 C). In-service temperature is less than 185 F (85 C). Store unopened material at 40 F to 95 F (4 C to 35 C). Shelf life is 24 months from the date of manufacture. The dried caulk is paintable, auto-bonding, and will not re-emulsify when dry.
What plastics and metals does the WF300 formula work with?
The PDS states WF300 adheres to lumber, gypsum board, and typical penetrant materials, and that most common penetrating items were successfully tested. The formula has been designed to be safe with plastics and is marked FBC System Compatible with FlowGuard Gold, BlazeMaster, and Corzan piping. Still consult the pipe, tubing, or cable maker for known sensitivities; STI does not guarantee compatibility with every plastic.
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