Fire-retardant silicone sealant promising up to four hours' fire resistance in linear joints. Peace of mind for contractors and facilities managers responsible for compartmentation and regulatory compliance. Does Bostik Fireseal Silicone FP402 deliver the certified performance and weatherproofing required on site?
⚡ At a Glance
- • Fire Resistance: Rated up to four hours in linear joints, tested to EN 1366-4 with ETA 20/1249
- • Best for: Contractors and installers sealing fire-rated linear joints up to 50mm wide
- • Not ideal for: Joints wider than 50mm without alternative backing or reinforcement
Fire-rated silicone sealant offering up to four hours' resistance in linear joints. Classified B-s1,d0 with Sa/S200 smoke leakage and suitable for joints up to 50mm, with UV and weather resistance.
Extended fire protection – thanks to EN 1366-4 tested formulation
Testing to EN 1366-4 and the ETA 20/1249 assessment confirms performance in linear joint scenarios, with classification B-s1,d0 under EN 13501-1. Smoke leakage performance is rated Sa / S200 to EN 1634-3.
Provides a certified barrier for compartmentation tasks that require documented fire performance, suitable for safety-critical sealing where regulations demand tested solutions.
Reliable application on larger gaps – with a non-slump silicone formulation
Formulated for excellent application and resistance to slumping, enabling neat beads in vertical and overhead joints. Suitable for joint widths up to 50mm without sag during tooling.
Speeds installation and reduces rework on site, keeping bead appearance consistent and simplifying installation in challenging positions.
Weatherproof and installer-friendly – with UV, water resistance and a Meko-free formulation
UV and water resistance maintain seal integrity when exposed externally, while the Meko-free formulation reduces reliance on that specific solvent chemistry.
Delivers durable external seals that stand up to weather and reduces concerns about that particular solvent during handling and application on site.
✨ The 4 Key Reasons for Bostik Fireseal Silicone FP402
- Non-slump formulation – Ensures neat vertical and overhead joints without sagging
- UV and water resistant – Keeps seals intact when exposed to sun and rain
- Meko-free formulation – Reduces exposure to MEKO for safer handling on site
- Smoke leakage classification Sa/S200 – Limits smoke spread according to EN 1634-3 testing
📋 Technical Details at a Glance
- Category: Fire-retardant silicone sealant
- Fire Resistance: Up to 4 hours in linear joints
- Standards / Certification: EN 1366-4, ETA 20/1249
- Fire Classification: B-s1,d0 (EN 13501-1)
- Smoke Leakage: Sa / S200 (EN 1634-3)
❓ Frequently Asked Questions
Q: Is the sealant suitable for joints wider than 50mm?
A: No, application is specified for joints up to 50mm wide; larger joints will require alternative backing or a different system.
Q: How long does the sealant maintain fire resistance?
A: Rated up to four hours in linear joints and tested to EN 1366-4 with ETA 20/1249 certification.
Q: Is it suitable for external use and wet conditions?
A: Yes, UV, water and weather resistance are specified, making it appropriate for exposed environments.
🏆 Our Verdict
The Bostik Fireseal Silicone FP402 suits contractors, installers and facilities managers who need certified fire-stopping for linear joints. Certified performance to EN standards, smoke leakage classification and weather resistance make it a dependable choice for safety-critical sealing. Durable formulation and recognised test evidence offer strong long-term value for compliance-focused projects.
