Sika Boom-420 Fire - EC 1 PLUS fire-resistant expanding PU foam - Sika

Sika Boom-420 Fire - EC 1 PLUS fire-resistant expanding PU foam - Sika

Sika Boom-420 Fire is a single-component, fire-resistant , expanding polyurethane foam .

The product is fire resistant for up to 180 minutes according to EN 1366-4.
The Sika Boom-420 Fire combo aerosol allows application with a gun (with adapter) or directly with the supplied extrusion nozzle .
EC 1 PLUS label: very low VOC emissions.

Features

• Fire resistance up to 180 minutes.
• Combo aerosol for application with a spray gun or directly from the extrusion nozzle.
• Single-component, ready to use.
• Safety valve for longer shelf life
• Hardened foam can be sanded, shaped and cut.
• EC 1 PLUS label: very low VOC emissions.

Areas of application

• Sika Boom-420 Fire restores the fire resistance performance of walls and floors that contain linear joints.
• For indoor use only.

Application

Application with a spray gun:

1. After shaking the package, remove the extrusion nozzle from the adapter.
2. Screw Sika Boom-420 Fire with the aerosol adapter onto the gun valve.
   The amount of extruded expanding foam can be adjusted by pressing more or less on the trigger or by tightening or loosening the knob on the gun.
3. Spray the mousse while keeping the aerosol can upside down.
4. Fill deep joints in several layers.
5. Wait long enough for each layer to expand and polymerize sufficiently before re-wetting for the next layer.
6. Do not completely fill the holes/cavities as the foam expands during polymerization.
7. Use an extension tube to fill narrow openings (the flow rate with an extension tube is lower).
8. Do not unscrew the unemptied Sika Boom-420 Fire aerosol from the gun.
   Removing an unemptied Sika Boom-420 Fire aerosol can can lead to foam splashing.
9. Thoroughly clean the gun after use with Sika Boom Cleaner.
10. Removing the aerosol without cleaning with Sika Boom Cleaner may damage the gun.

Application to the extrusion nozzle:

1. After shaking the packaging, remove the extrusion nozzle from the adapter and remove the adapter from the aerosol.
2. Screw the extrusion nozzle firmly onto the aerosol can without pressing the trigger.
   The amount of extruded expanding foam can be adjusted by pressing the trigger more or less.
3. Spray the foam while keeping the aerosol can upside down. Fill deep joints in several layers.
4. Wait long enough for each layer to expand and polymerize sufficiently before re-wetting for the next layer.
5. Do not completely fill the holes/cavities as the foam expands during polymerization.
6. Use an extension tube to fill narrow openings (the flow rate with an extension tube is lower).

Consumption

*with 20 × 50 mm seal

Packaging

750 ml aerosol with safety valve: Red.

Replacement for Sika Boom-400 Fire

FAQ - Frequently Asked Questions

1. Is the foam really fireproof?
   Yes, Sika Boom-420 Fire is EI certified for up to 240 minutes according to EN 1366-4. It prevents the spread of flame and smoke in compliant joints.
2. Can it be used on all materials?
   It adheres to most common materials, concrete, brick, plaster, wood, PVC, metal… It should not be used on PE, PP or PTFE, which have poor adhesion.
3. Can you paint the foam?
   Yes, after it has fully hardened. It can also be cut and sanded.
4. Is the foam suitable for spraying?
   Yes, it's a sprayable foam, ideal for precise flow control.
5. Is it suitable for indoor use?
   Perfectly, its EC1 PLUS class guarantees very low emissions, suitable for enclosed or sensitive areas (homes, schools, etc.).
6. Can it be used outdoors?
   Yes, provided that the hardened foam (plaster, sealant, paint) is protected against UV rays and humidity.
7. What is the drying time?
   Approximately 10 minutes for skin formation and 12 hours for complete hardening.
8. What is the thermal resistance?
   From -40°C to +90°C once hardened.
9. Can it be used to fix a fire door?
   Yes, it is designed for this type of application, provided that the manufacturer's instructions and local regulations are followed.
10. Can foam replace fireproof mortar?
    It can replace certain systems in certified joints, but must be used in configurations approved by Sika. For complex penetrations, a fire-resistant mortar or coating may still be necessary.