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Everflex Fire-Fill is a waterborne co-polymer intumescent sealant engineered to maintain the Fire Resistance Level of fire-rated partitions breached by service penetrations or expansion joints. This formula provides a critical 4-hour fire rating by expanding under heat to form a solid inorganic plug, effectively blocking smoke and flame transmission in annular gaps and linear joints.
Certified to AS1530.4 and AS4072.1, it accommodates ±20% joint movement and features high UV resistance, making it suitable for sealing precast concrete panels in external building facades. To prevent adhesion loss or washout failure, ensure concrete has cured for 28 days and the installation is protected from rain for 24 hours.
This low-VOC sealant also provides STC acoustic properties to meet Green Star requirements while maintaining airtight integrity in high-rise service risers.
Frequently Asked Questions
Can Everflex Fire-Fill be applied to damp surfaces?
Yes – it can tolerate slightly damp surfaces, but not free water or pooling moisture. For best results, ensure substrates are clean, structurally sound, and surface moisture is minimal. Avoid application if rain exposure is likely within 24 hours.
Is priming required before using Fire-Fill?
Priming is not normally required for most substrates. For critical joints, multi-storey buildings, or highly stressed applications, use Adheseal 50A Surface Prep (non-porous) or Adheseal 2001 / Supaprime (porous).
Can Fire-Fill be painted over?
Yes – it is paintable with acrylic, oil, and rubber-based paints. Check adhesion and flexibility of paint first, as rigid paints may crack with joint movement.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Wall / Floor Joints | Provides tested FRL up to 4 hrs with ±20% movement | Builders, Fire Contractors |
| Service Penetrations | Forms intumescent plug to stop fire spread through penetrations | Fire Stopping Installers |
| Precast & Tilt-Up Panels | Flexible, weather-resistant seal for external expansion joints | Concrete Contractors |
Applying Everflex Fire-Fill: Enhanced Protocols & Best Practices
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Surface Preparation
Ensure substrates are sound, dry, and free of dust, grease, or contaminants. For deep joints, install open-cell backer rod 25% larger than joint width.
Timing: Allow concrete to cure 28 days before application.Pro Tip: Use masking tape for clean joint edges and remove immediately after tooling before skin forms. -
Sealant Application
Cut nozzle at 45° angle and gun sealant ahead of nozzle, ensuring full contact with both sides of joint. Tool off within 10 minutes for smooth finish.
Timing: Skin time 30–45 minutes @ 25°C, full cure 7 days (20mm x 10mm joint).Pro Tip: Avoid trapping air during application – this can cause bubbling and compromise FRL rating.
Limitations & Safety
Product Limitations
Not suitable for trafficable joints or long-term water immersion.
Do not use in totally confined spaces without atmospheric humidity (curing will not occur).
Avoid application when rain exposure is expected within 24 hours.
Safety & Handling Requirements
Personal Protective Equipment
Wear nitrile gloves, safety glasses, and protective clothing to avoid skin/eye contact.
Ventilation Requirements
Ensure adequate ventilation during application. Use in well-ventilated areas to avoid inhaling vapours.
Fire & Handling Precautions
Keep away from ignition sources. Store in a cool, dry place below 25°C.
Emergency First Aid
Eyes:
Flush with water for 15 minutes. Seek medical advice.
Skin:
Wash with soap and water. Remove contaminated clothing.
Inhaled:
Move to fresh air. Seek medical attention if symptoms persist.
Swallowed:
Rinse mouth. Do NOT induce vomiting. Seek immediate medical assistance.
Seek medical attention immediately in all cases of serious exposure.
Everflex Fire-Fill Application Guide
Concrete, Masonry, Brick
Surface Preparation
Ensure surfaces are fully cured (28 days for concrete), clean, and free from laitance, dust, oils, curing compounds, and contaminants. Mask edges for neat joints.
Primer Requirements
Primer recommended for critical joints
For optimal performance, apply Adheseal 2001 or Supaprime primer, allowing 30 min to 2 hrs before sealant application.
Metals & Non-Porous Surfaces
Surface Preparation
Lightly abrade surface with fine abrasive pad, then clean with solvent wipe. Remove all oxidation and contaminants.
Primer Requirements
Primer recommended for optimal adhesion
Pre-treat with Adheseal 50A Surface Prep. Apply sealant within 30 mins – 2 hrs of priming.
| Document | Download |
|---|---|
| Everflex Fire-Fill Technical Data Sheet | |
| Everflex Fire-Fill Safety Data Sheet |
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