FS4 Fireshield Intumescent Sealant (White) is a high-performance, acrylic-based, solvent-free sealant engineered for fire and sound containment in construction joints. Specifically designed to intumesce—expand under heat—it forms a protective, inert barrier against flames and smoke, offering up to 4 hours of fire resistance, depending on joint configuration and depth.
Its non-slumping, rapid-skinning consistency enables clean application even in vertical and overhead joints. Once cured, it remains permanently flexible, accommodating minor structural movements without cracking or shrinking.

It also provides an acoustic seal, contributing to sound insulation—achieving decibel reductions around 55 dB in tests .

Compliance with fire-safety and acoustic standards such as EN 1366‑3, EN 1366‑4, and EN ISO 10140‑2 (2010) ensures suitability for use in interior linear joints in floors, ceilings, partition partitions, dry lining, and pipe penetrations.