Product Description

The STI SpecSeal® Composite Sheet is a lightweight, rigid fire-resistant panel made of an intumescent layer bonded to galvanized steel, reinforced with wire mesh and covered with aluminum foil.
When exposed to fire, it expands up to 15× to form a dense, insulating char that minimizes heat transfer and seals medium- to large-sized openings in fire-rated walls and floors.

Key Benefits

• High Expansion – Expands 15× under fire, providing robust insulation and fire containment.
• Versatile Applications – Seals penetrations for metallic/non-metallic pipes, cable trays, conduits, ducts, and blank openings.
• Easy Installation – Lightweight, cuttable with sheet metal tools, reducing labor and handling effort.
• Durable Barrier – Provides fire, smoke, and combustion gas protection up to 4 hours.
• Paintable Surface – Can be finished to match surrounding construction.
• UL Certified – Tested to ASTM E814 (UL1479) and CAN/ULC-S115 standards.

Packaging

• CS1628: 16” × 28” (41 × 71 cm), 5.80 lbs (2.63 kg)
• CS2436: 24” × 36” (61 × 92 cm), 10.65 lbs (4.83 kg)
• CS3636: 36” × 36” (92 × 92 cm), 15.65 lbs (7.10 kg)
• CS3641: 36” × 41” (92 × 104 cm), 16.60 lbs (7.53 kg)
• CS2852: 28” × 52” (71 × 132 cm), 16.38 lbs (7.43 kg)