Composite Sheet Firestop Panels

Composite Sheet Firestop Panels

Specified Technologies

The SpecSeal Composite Sheet is a lightweight, rigid, fire-resistant panel composed of an intumescent layer bonded to a galvanized steel sheet reinforced with steel-wire mesh covered with aluminum foil. Reduces large openings and can be combined with other SpecSeal or EZ-Path Firestop products.


  • Lighter weight for easy handling and fabrication and less hanging weight on walls
  • Less than 1/2 in. the thickness of the traditional composite sheet products
  • Easier to fabricate as it can be cut and installed with common sheet metal tools
  • Higher intumescence expanding up to 15 times when exposed to temperatures in excess of 350°F (177°C)
  • UL Classified
Anixter No. Manufacturer No. Description
305971 CS1628 16 x 28 in. (41 x 71 cm)
305972 CS2436 24 x 36 in. (61 x 92 cm)
305973 CS3636 36 x 36 in. (92 x 92 cm)
305974 CS3641 36 x 41 in. (92 x 104 cm)
305975 CS2852 28 x 52 in. (71 x 132 cm)