STI SpecSeal 20 oz Sausage Intumescent Firestop Caulk Red WF320

WF300 Caulk is a latex based, high solids firestop caulk. This material, when properly installed, effectively seals penetration openings in wood frame construction against the spread of fire, smoke and combustion byproducts. WF300 Caulk is a single stage intumescent. When exposed to elevated temperatures, WF300 expands rapidly to seal off voids left by the burning or melting of combustible materials. WF300 Caulk is storage stable (when stored according to manufacturer’s recommendations) and will not separate or shrink when dried. WF300 adheres tenaciously to common construction materials such as lumber and gypsum board as well as typical penetrant materials

• Water based for easy installation, cleanup and disposal
• Intumescent
• Water-resistant, will not re-emulsify when dry
• Paintable when dry
• Safe, no asbestos, no PCB's, no inorganic fibers
• Auto bonding
• Non-halogenated
• Meets LEEDTM v3 requirements. Low emitting materials credit. See general LEED letter for additional applicable credits
• Installer friendly, easily applies with standard caulking gun
• Suitable for combustible and non-combustible penetrants
• Tested for up to 3 ours of fire exposure when tested to ASTM E814/UL1479

• Permanent
• Autobonding
• Intumescent
• Low VOC
• Paintable
• STC Rating
• Water Based
• Smoke Barrier

• ASTM E84 (UL723)
• ASTM E90
• ASTM E119 (UL263)
• ASTM E814 (UL1479)
• ASTM G21
• CAN/ULC-S115

• Color: Red
• Coverage Area: 36 cu. in.
• Density/Weight per Gallon: 10.2 lbs/gal (1.22 kg/L)
• Smoke Development: 20
• 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
• Average Volume Shrinkage (ASTM C1241): 23.5%