Product Description

The STI SpecSeal® LC Endothermic Firestop Sealant is a high-solids, latex-based firestop compound formulated with endothermic fillers that absorb heat and release water during fire exposure.
It effectively seals joints and penetrations against fire, smoke, hot gases, and water, forming a flexible, durable barrier.
Non-halogenated and asbestos-free, it is engineered for easy application by caulking or troweling on walls, floors, and around non-combustible penetrants.

Key Benefits

• Endothermic Fire Protection – Absorbs heat and releases water to delay fire spread.
• Reliable Ratings – Tested to ASTM E814 (UL1479), ASTM E1966 (UL2079), and CAN/ULC-S115 with up to 4-hour protection.
• Durable & Flexible – Withstands movement ±12.5% (25% compression) with 500-cycle performance.
• Water & Smoke Seal – Excellent resistance to re-emulsification, effective smoke control (STC 61).
• Safe & Sustainable – Low VOC, non-halogenated, no asbestos or inorganic fibers, LEED® compliant.
• Installer Friendly – Easy caulking and high-build application, red color for easy inspection.

Packaging

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