BOSTIK FP403 Fireseal Fire Resistant Hybrid Polymer Sealant - Grey

The BOSTIK FP403 FIRESEAL is a high-performance, one-component hybrid MS polymer sealant engineered specifically for demanding fire-resistant applications. This advanced fireproof sealant provides a robust and flexible barrier, offering up to four hours of fire protection for linear joints while accommodating up to 25% movement capability due to its ±25% flexibility. It is an essential solution for ensuring compartmentalisation and maintaining the integrity of fire-rated constructions.

Certified to EN 1366-4, this high-modulus sealant delivers exceptional performance in both vertical and horizontal joints, making it highly versatile for a wide range of sealing tasks. Beyond its primary fire-stopping function, it also provides excellent acoustic insulation, helping to reduce sound transmission between rooms. Its formulation allows for interior and exterior use, with UV and weather resistance ensuring long-term durability and performance without cracking or degrading.

Key Features & Benefits

• Superior Fire Protection: Fire rated for up to 4 hours, certified to EN 1366-4, EN 13501-1 (Class B-s1,d0), and EN 1634-3 (Sa and Class S200).
• Flexible and Durable: High-modulus hybrid MS polymer offers ±25% movement capability, accommodating structural shifts without compromising the seal.
• Excellent Sound Insulation: Contributes to improved acoustic performance in buildings.
• Versatile Application: Suitable for sealing walls, floors, ceilings, and metal frames. Certified for all metal stud (gypsum) connections.
• Low Emissions: Holds the stringent GEV EMICODE EC1 PLUS certification for very low volatile organic compound (VOC) emissions, supporting healthier indoor air quality.
• Weather and UV Resistant: Formulated for reliable performance in both interior and exterior environments.
• Sustainable Packaging: Supplied in a post-consumer recycled (PCR) cartridge, (