Dow Corning Dowsil Firestop 400 Intumescent Acrylic Sealant White 380ml

Dow Corning Dowsil Firestop 400 White Intumescent Acrylic Sealant 380ml Trade Cartridge

MPN: 2938863

Barcode: 5011107561405

Size: 380ml

Colour: White

Rating: 2 hour Fire rating

Dow Corning Dowsil Firestop 400 Intumescent Acrylic Sealant – White (380ml)

Ensure superior fire protection and structural safety with Dow Corning Dowsil Firestop 400 Intumescent Acrylic Sealant, advanced fire-rated sealant is designed to expand when exposed to high temperatures, forming an insulating barrier that slows the spread of fire, smoke, and toxic gases. It provides excellent adhesion to a wide variety of construction materials, including concrete, brick, and plasterboard. Ideal for fire-rated walls, floors, and partitions, this sealant helps meet building safety standards and ensures long-term fire protection in both residential and commercial properties.

Dow Corning Dowsil Firestop 400 is an intumescent acrylic sealant for 2 hour internal applications, developed to maintain the integrity of fire walls or partitions, Dowsil Fire stop 400 does not emit halogenated by-products under fire conditions, resists mildew and mould growth and can be painted with emulsion for decoration, main uses for internal perimeter pointing around door and window frames, and in joints formed where fire rated partition sections meet fire ceilings and walls, in integral house garages, in fact any area were services will pass through into another area.

Dowsil Firestop 400 Benefits:

• Tested to B.S.476 Part 22: 1987 and B.S.476 Part 7: 1987
• Up to a 4 hour fire rating can be achieved
• Class 2 classification for surface spread of flame
• Mean toxicity index 2.0 when tested to NES713: 1985
• Resists mildew and mould growth
• 30-45 minutes tack free time
• Good un-primed adhesion to most common construction substrates

Why Choose Dow Corning Dowsil Firestop 400 Intumescent Acrylic Sealant?

The Dow Dowsil Firestop 400 acrylic sealant is specifically formulated to provide critical fire resistance and smoke control in fire-rated building elements. During a fire, the intumescent properties cause the sealant to expand, filling gaps and creating a protective barrier against heat and smoke. Its acrylic-based formula adheres well to porous and non-porous surfaces and can be easily applied and tooled for a professional finish. Certified to meet fire safety standards, this product is essential for creating and maintaining fire-resistant joints, penetrations, and gaps in walls, floors, and ceilings.

Key Features

• Fire Protection: Expands under heat to form an insulating barrier, helping to prevent the spread of fire, smoke, and toxic gases.
• Certified Fire Resistance: Tested to meet fire safety and building regulations, ensuring compliance with fire-rated construction requirements.
• Intumescent Properties: Expands when exposed to high temperatures, providing enhanced protection for up to 4 hours, depending on joint size and conditions.
• Excellent Adhesion: Bonds securely to concrete, brick, plasterboard, and other construction materials.
• Durable and Flexible: Accommodates slight joint movement without cracking, maintaining long-term protection.
• Easy to Apply: Can be easily applied with a caulking gun and tooled for a smooth, professional finish.
• White Finish: Offers a clean, neat appearance for visible joints and gaps in fire-rated assemblies.

Applications

The Dow Corning Dowsil Firestop 400 Intumescent Acrylic Sealant is suitable for a wide range of fire protection applications, including:

1. Fire-Rated Walls and Partitions: Provides a fire-resistant seal for expansion joints, penetrations, and gaps in walls and partitions.
2. Ceilings and Floors: Creates fire-resistant seals in horizontal and vertical construction joints, including floor-to-wall joints.
3. Service Penetrations: Seals around pipes, cables, and ductwork passing through fire-rated elements to prevent the spread of fire and smoke.
4. Compartmentation: Helps maintain compartmental integrity in buildings by sealing gaps and joints between fire-resistant materials.
5. Commercial and Residential Properties: Suitable for use in office buildings, schools, hospitals, apartments, and other structures where fire protection is essential.

Benefits of Dow Corning Dowsil Firestop 400 Sealant

• Enhanced Fire Safety: Expands during a fire to block heat, flames, and smoke, improving building safety and occupant protection.
• Regulatory Compliance: Tested and certified to meet fire safety standards, ensuring compliance with building codes and regulations.
• Strong Adhesion: Bonds effectively to both porous and non-porous surfaces, providing reliable performance in various construction environments.
• Durable Performance: Maintains its integrity over time, even under varying environmental conditions.
• Professional Finish: The smooth, white finish enhances the appearance of fire-rated joints and gaps in visible areas.

How to Use Dow Corning Dowsil Firestop 400 Sealant

For best results, follow these steps when applying Dow Corning Dowsil Firestop 400:

1. Prepare the Surface: Clean and dry the surfaces to remove dust, grease, and contaminants. Ensure all areas are free of loose debris.
2. Cut the Nozzle: Trim the nozzle at an angle to match the desired bead size and attach it to the cartridge.
3. Load the Cartridge: Insert the cartridge into a compatible caulking gun for controlled application.
4. Apply the Sealant: Apply a continuous bead along the joint or penetration, ensuring full contact with the surrounding surfaces.
5. Tool the Seal: Smooth the bead immediately using a tooling stick or spatula to create a neat, uniform finish.
6. Allow to Cure: The sealant will skin over within approximately 15-30 minutes and fully cure within 24-48 hours, depending on joint size and environmental conditions.

Specifications

• Brand: Dow Corning (Dowsil)
• Product Name: Firestop 400 Intumescent Acrylic Sealant
• Quantity: Single cartridge (380ml)
• Application: Fire-rated joints, gaps, and service penetrations in walls, floors, and ceilings
• Cure Type: Acrylic-based
• Fire Resistance: Intumescent properties, up to 2 + hours of fire protection depending on application.
• Colour: White
• Adhesion: Suitable for concrete, brick, plasterboard, and other construction materials

Frequently Asked Questions

1. How does this sealant provide fire protection?
The Dow Dowsil Firestop 400 is an intumescent sealant, meaning it expands when exposed to high temperatures. This expansion creates an insulating barrier that blocks the passage of flames, heat, smoke, and toxic gases, helping to contain fire within a specific area and prevent its spread.

2. Is this sealant certified for fire-rated construction?
Yes, Dow Dowsil Firestop 400 has been tested and certified to meet fire safety and building regulations. It provides fire resistance for up to 4 hours, depending on the joint or penetration size, helping contractors comply with fire protection requirements.

3. What surfaces can this sealant bond to?
This sealant adheres well to a variety of construction materials, including concrete, brick, plasterboard, and metal. It is suitable for both porous and non-porous substrates, ensuring reliable adhesion and long-term fire protection.

4. How long does the sealant take to cure?
The sealant skins over within 15-30 minutes and typically cures fully within 12 to 24 hours. Curing time may vary depending on environmental factors such as temperature, humidity, and joint dimensions. Avoid exposing the sealant to heavy water or mechanical stress during the initial curing period.

5. Can I use this sealant for both vertical and horizontal joints?
Yes, Dow Dowsil Firestop 400 is suitable for both vertical and horizontal joints. It provides excellent adhesion and flexibility, making it ideal for various fire-rated applications, including walls, floors, and ceilings.

"Always read the Technical Datasheet prior to first use to ensure you have the correct information and product for your application"

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