B1 Foam Aerosol Grade FR 750 ml is a premium fire-retardant expanding polyurethane foam designed for professional-grade fire-stopping of gaps, joints, and penetrations in walls, floors, and ceilings. The “B1” classification indicates a high level of fire resistance—in compliance with many safety standards—meaning it helps prevent the spread of flames and smoke for defined periods when correctly installed. Delivered in a convenient 750 ml aerosol can, this foam effortlessly expands and cures upon application without requiring mixing or special equipment.
Once applied into gaps between masonry, concrete, or plasterboard, the foam expands to fill voids, sealing tightly around pipes, cables, ducts, and structural joints. As it cures, it forms a rigid, closed-cell structure that offers excellent insulation, sound dampening, and thermal performance. After full cure, it can be trimmed flush with the surface and finished over—making it ideal for use ahead of sealing, plastering, or rendering.