STI® SpecSeal® Composite Sheet is the ideal solution for large openings where a permanent seal is required. Composite sheet consists of a thin sheet steel with intumescent embedded onto a single side. Composite sheet works well with other SpecSeal® firestop products such as Firestop Collars and EZ-Path® Devices to size down oversized openings.
- Professional fit and finish
- Easily cut with hand sheers
- Tested for up to 4 Hours of fire resistance when tested to ASTM E814/UL1479
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