China Fire-Retardant PU Foam B1 Sealant - High-Performance Suppliers & Factory Solution for Doors and Windows
Exceptional Fire Retardancy (Class B1/B Certified)
This foam sealant is specially engineered with fire-retardant additives that meet stringent international standards (such as GB 8624 B1, EN 13501-1). In the event of fire, it exhibits excellent resistance to flame propagation and is designed to be self-extinguishing upon removal of the ignition source. It forms a protective char layer that helps delay the spread of flames and hot gases through openings, making it a critical component for passive fire protection in door and window perimeters, thereby enhancing overall building safety.
High Hardness and Dimensional Stability
Unlike standard insulating foams that remain soft, this product cures to a high-hardness, rigid structure with minimal long-term shrinkage. This provides outstanding mechanical strength and load-bearing capacity, ensuring that installed doors and windows remain securely fixed, resistant to sagging, and unaffected by wind pressure or operational stresses. The rigid seal also prevents compression over time, guaranteeing a permanent, gap-free fit.
Superior Soundproofing and Acoustic Insulation
The high-density, closed-cell structure of the cured foam acts as an effective sound-dampening barrier. It significantly reduces the transmission of airborne noise (such as traffic, urban sounds, and voices) through gaps around window and door frames. This contributes to a noticeably quieter, more peaceful, and comfortable indoor environment, meeting the growing demand for enhanced acoustic comfort in modern construction.
Excellent Adhesion and Airtight / Watertight Seal
It adheres tenaciously to a wide variety of common construction materials including concrete, brick, wood, PVC, and metals. By completely filling irregular cavities and gaps, it creates a continuous air and weather barrier. This superior seal blocks drafts, moisture infiltration, and dust, dramatically improving the building's thermal insulation (reducing heating/cooling costs) and protecting against water damage.