The Bostik Fire & Acoustic Sealant C20 White is a professional-grade, water-based intumescent acrylic sealant engineered to provide fire protection and sound insulation in building joints and service penetrations. Designed for interior use in commercial and residential construction, it helps maintain compartmentation by restricting the spread of fire, smoke, and toxic gases.
 
Formulated to swell and char when exposed to high temperatures, this sealant forms an expanding carbonaceous barrier that seals gaps during a fire emergency. Additionally, its acoustic properties reduce sound transmission through wall and floor joints, making it an ideal solution for party walls and partitioning where both fire safety and acoustic ratings are building-regulation requirements.
 
Supplied in a convenient C20 cartridge format for standard skeleton guns, the smooth paste applies easily, tooling to a clean finish that can be painted over once fully cured. It serves as an essential safety consumable for contractors, dry-liners, and builders working on fire-rated partitions, door frames, and service ducts.