<br>SpecSeal® Firestop Pillows are through-penetration firestop products resembling small cushions or soft bricks. These in tumescent and highly resilient pillows are installed in openings by compressing and stacking into the opening in a brick-like fashion.<br>SpecSeal® Firestop Pillows consist of a mineral fiber core material sealed with a water-resistant in tumescent membrane. This coated core material is then heat-sealed in a tough, non-irritating, fire-retardant poly bag.<br><br>In tumescent – Expands in all directions for a tough, tight seal.<br>Re-install-able for easy retrofitting of cables.<br>Single Side Application makes installation easy for tough access openings.<br>Lightweight for ease of installation. Easier wire screen requirements.<br>Heat-Sealed Poly Bag – Strong &amp; durable. No sewn seams to unravel or tear. No irritating fiberglass.<br>Monolithic Encapsulated Core – No loose fill!<br>No Special Tools Required!<br>Superior Air Leakage Ratings!<br>Heat Sealed Poly Cover protects core and allows pillows to slide in and out with ease.<br>&nbsp;