Product Description

The STI SpecSeal® Firestop Blocks are lightweight, intumescent polyurethane foam blocks designed for easy penetration firestopping.
Installed like foam bricks, they expand under heat to block fire, smoke, and gases, providing up to a two-hour fire rating.
Ideal for cables, trays, pipes, and mixed penetrations, they are reusable and retrofit-friendly for both new and existing installations.

Key Benefits

• Intumescent Expansion – Expands 3× under heat for a tight, durable seal.
• Reinstallable & Retrofit-Friendly – Cables and pipes can be added or removed easily.
• Fast Installation – No cure time, no special tools required.
• Lightweight & Cuttable – Easy handling and sizing for different penetrations.
• Superior Performance – Meets ASTM E814 (UL1479) and CAN/ULC-S115 fire tests.
• Safe & Clean – Dust-free, fiber-free, halogen-free, solvent-free, and mold resistant.

Packaging

• Product Form: Intumescent polyurethane foam block
• Color: Brick Red
• Size: 2” × 5” × 8” (50.8 × 127 × 203.2 mm)
• Case Qty: 24 blocks per case
• Weight: ~1.0 lbs (0.45 kg) per block