3M Fire Barrier Sealant CP 25WB+ is a premium grade, one component, water based intumescent firestop sealant engineered for through penetration and construction joint applications. It provides up to 4 hour fire resistance when tested in accordance with ASTM E814 (UL 1479) and CAN/ULC-S115 standards, ensuring reliable fire containment in critical building assemblies. In the event of a fire, the sealant expands (intumesces) to help block the spread of flames, smoke, and toxic gases.
This sealant features excellent sag resistance, allowing for clean and efficient application on both vertical and horizontal surfaces. It adheres strongly to common construction materials such as concrete, metal, wood, gypsum board, plastic, and cable jacketing. The water based formula makes it easy to apply using standard caulking equipment, while also allowing simple clean up and paintability after curing.
Additionally, CP25WB+ is re-enterable and repairable, making it ideal for installations that may require future modifications such as cable additions or pipe adjustments. It also helps minimize sound transfer, contributing to improved acoustic performance in rated wall and floor systems.
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