BOSTIK FP403 Fireseal Hybrid White
£5.38 inc. VAT
£4.48 ex. VAT
- Product ID: 30623576
- Area of use: EXT & INT
- Application Method: Application Gun
- Volume: 290ml
- Container Type: Cartridge
- Type: Sealant
- Colour: White
- Brand: Bostik
- Manufactuer: Bostik
Bostik FP403 Fireseal Polymer Sealant is a one-component, fire-resistant hybrid sealant designed for sealing linear joints for up to 4 hours. With up to 25% movement capability and high modulus, it can be used in both vertical and horizontal joints, offering excellent sound insulation. Suitable for walls, floors, ceilings, metal frames, and all metal stud (gypsum) connections, this MS polymer sealant is UV and weather resistant, interior and exterior use capable, and GEV EMICODE EC1 PLUS certified for very low emissions. It is fire rated to EN 1366-4 and comes in a post-consumer recycled (PCR) cartridge.
Key Points:
– Fire resistant for up to 4 hours with high sound insulation
– +/- 25% flexibility and high modulus for movement accommodation
– UV and weather resistant; suitable for interior and exterior applications
– GEV EMICODE EC1 PLUS certified for very low emissions, supplied in PCR cartridge
STORAGE CONDITIONS
Store for up to 18 months from the production date in the original, unopened packaging, in cool, dry conditions between +5°C and +25°C, away from direct sunlight. Protect from frost.
For more in our range of fire rated sealants, please click here. For our full range of products from Bostik, please click here.
For more information on Bond It and their products, you can visit their website here
BOSTIK FP403 FIRESEAL HYBRID is a professional, one-component fire resistant sealant designed for sealing connection and expansion joints in construction, preventing the spread of fire, smoke, and toxic gases. Suitable for up to 4 hours of fire resistant protection in linear joints, including wall-to-ceiling and wall-to-floor connections, it features high modulus, excellent sound insulation, UV and weather resistance, flexibility, and paintability. Ideal for both interior and exterior use, it adheres well to a wide range of construction materials and is certified for horizontal joints, floor/ceiling-to-wall connections, wooden and steel frames, stony substrates, and metal stud applications. Compliant with BS EN 1366-4, it provides fire resistance for up to 240 minutes in joints up to 30 mm wide, while being sustainable and low VOC.
Key Points:
– Fire resistant for up to 4 hours in linear joints
– High modulus, flexible, and paintable with sound insulation
– Suitable for interior and exterior use on various substrates and frames
– Compliant with BS EN 1366-4 and low VOC/sustainable formulation
PREPARATION
– Work in well-ventilated conditions at temperatures between +5°C and +40°C.
– Ensure all necessary materials and tools are prepared before starting.
– Joint surfaces must be clean, sound, dry, and free from dust, loose material, or other contaminants that could affect adhesion.
– Very porous substrates such as gypsum, aerated concrete, and limestone should be primed before application. Always test adhesion prior to use.
– Masking tape can be applied along joint edges to help achieve a neat finish and protect nearby surfaces. Use a round-ended spatula to tool the sealant and ensure it fits properly in the joint, catching any excess.
– Perform a test run without sealant to familiarize yourself with challenging areas, such as corners or raised joints.
APPLICATION
1. Unscrew the nozzle, carefully cut off the dome of the cartridge with a sharp knife without damaging the thread, and attach the nozzle.
2. Cut the tapered end of the nozzle at a 45° angle to match the width of the joint.
3. Insert the cartridge into a cartridge gun, press the release plate, pull out the plunger, and squeeze the trigger until the sealant appears.
4. Position the nozzle at the start of the joint and apply slowly, ensuring the sealant contacts both sides of the gap. Release the trigger at the end and press the plunger release plate to stop flow.
5. Correct joint dimensions are essential for absorbing movements. The joint depth should always relate properly to the width.
6. For joints up to 10 mm wide, maintain a 1:1 depth-to-width ratio, with a minimum of 5 mm. For joints wider than 10 mm, the depth should equal the width divided by 3 plus 6 mm.
7. Within the working time, smooth the sealant with a wet, round-ended tool (avoid using a wetted finger), remove excess with a wet cloth, and peel off masking tape if used.
8. In damp or wet environments, tool the sealant to allow water to run off the surface.
9. After use, clean excess from the nozzle and replace the cap.
10. The sealant skins over in approximately 10 minutes and cures at 2–3 mm per 24 hours depending on bead width, temperature, and humidity.
CLEANING
Uncured Sealant: Remove excess mechanically with a soft scraper, then wipe with a cloth moistened with water. Repeat as needed.
Cured Sealant: Carefully cut away excess with a sharp knife. Avoid solvents on skin—use soap and water for tools and hands.
PAINTABILITY
Bostik FP403 FIRESEAL HYBRID is paintable with water-based and synthetic paints when fully dry in small dimension joints. For wider joints, paint cracking may occur, so compatibility testing is recommended before application.
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| Elementlength | |||||||
| up to 1,5 m |
up to 2,5 m |
up to 3,5 m |
up to 4,5 m |
up to 2,5 m |
up to 3,5 m |
up to 4,5 m |
|
| Type of window frame material |
Minimum witdth of joints for a butled mounting b in mm |
Minimum witdth of joints for a inner mounting b in mm |
|||||
| Hard PVC (white) | 10 | 15 | 20 | 25 | 10 | 10 | 15 |
| Hard PVC and PMMA (dark) (colour extruded) |
15 | 20 | 25 | 30 | 10 | 15 | 20 |
| Hard PUR integral foam | 10 | 10 | 15 | 20 | 10 | 10 | 15 |
| Wood-aluminium-window | 10 | 10 | 15 | 20 | 10 | 10 | 15 |
| Aluminium-plastic sandwich frame (bright) |
10 | 10 | 15 | 20 | 10 | 10 | 15 |
| Aluminium-plastic sandwich frame (dark) |
10 | 15 | 20 | 25 | 10 | 10 | 15 |
| Wooden window frame | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
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