Product Description

The STI SpecSeal® SSS Intumescent Firestop Sealant is a latex-based, high-solids firestop compound that seals penetration openings against fire, smoke, hot gases, and water.
It features STI’s proprietary two-stage intumescent technology, expanding aggressively when exposed to high temperatures to quickly seal voids. Its multi-viscosity formulation provides excellent caulking and high-build properties for vertical and overhead applications.

Key Benefits

• Two-Stage Intumescence – Expands up to 8× under fire to seal combustible voids.
• Reliable Firestop – Tested to ASTM E814 (UL1479) and CAN/ULC-S115 with ratings up to 4 hours.
• Versatile Applications – Approved for metallic/nonmetallic pipes, cables, trays, bus ducts, HVAC ducts, and insulated pipes.
• Durable & Safe – Non-halogenated, no asbestos, PCB-free, and water-resistant after curing.
• Acoustic Seal – Achieves STC 62 for sound-rated assemblies.
• Paintable & Sandable – Easy finishing for construction projects.

Packaging

• Cartridges: 10.1 oz (300 ml), 29 oz (858 ml)
• Sausage Packs: 20 oz (592 ml)
• Pails: 2 gallon (7.6 L), 5 gallon (19 L)
• Color: Red
• Shelf Life: 24 months (unopened)