SpecSeal® Firestop Blocks – High-Performance Intumescent Foam
The SpecSeal® Firestop Block is an intumescent polyurethane foam brick designed for easy firestopping of medium to large openings. Installed by compressing and stacking in a brick-like fashion, it expands under high temperatures to seal against fire, smoke, and gas. Suitable for both temporary and permanent sealing, it allows fast retrofitting without damaging the firestop seal and is approved for use in gypsum board walls, block walls, and concrete floors.

Key Features & Benefits

• Intumescent – expands in all directions for a tough, tight seal
• Reinstallable for easy retrofitting of cables, pipes, and ducts
• Lightweight for quick and easy handling
• Superior air leakage ratings for enhanced performance
• No cure time – immediate application possible
• Can be cut to size for different penetration shapes and sizes
• Dust-free, fiber-free, halogen-free, and solvent-free
• Compatible with a wide range of penetrants (verify with manufacturer for plastics)
• Paintable if required
• LEED VOC compliant (<5 g/l)

Applications

• Firestopping medium to large openings containing pipes, conduits, cables, and cable trays
• Data, communications, power, or control cable installations
• HVAC ducts, bus ducts, and insulated metal pipes
• One-sided shaft wall installations and other limited-access firestop scenarios
• Retrofit applications for adding or replacing cables without damaging seals

Product Specifications

Available Variant