Our most popular intumescent firestop sealant with over 600 tested and listed systems.

• Up to 4-hour fire ratings per ASTM E 814 (UL 1479)
• Superior adhesion — bonds to concrete, metals, wood, plastic and cable jacketing
• Extensive library of UL Classified fire protection systems
• Intumescent — expands when heated to seal around items exposed to fire
• Low VOC*