SpecSeal® Firestop Blocks are penetration firestop products resembling foam bricks. These intumescent urethane foam blocks are installed in openings by compressing and stacking into the opening in a brick-like fashion. The intumescent block expands in high temperatures to impede fire, smoke, and gas passage.

SpecSeal® Firestop Blocks may be used to seal cables, cable trays, pipes, and small, medium, or large openings temporarily or permanently. SpecSeal® Firestop Blocks may be used in both new or existing applications making short work of complex penetration firestop conditions.