Fire-Rated Intumescent Sealant for Penetration and Void Sealing (Up to 4 Hours Protection)
The FIREFLY® FR Graphite High Expansion Sealant is a high-performance, water-based intumescent solution designed to maintain the fire integrity of walls and floors by sealing around service penetrations and voids. Upon activation at 150°C, it expands up to 700%, closing gaps caused by melted combustible materials and ensuring up to 4 hours of fire resistance, as tested to BS EN 1366-3, BS EN 1364-1, and BS EN 1364-2.
Ideal for both horizontal and vertical applications, this sealant is suitable for use with plastic pipes, cable trays, insulated metal pipes, and single or bunched cables. It’s fully compatible with the FIREFLY® FB180 Batt System, offering a tested, certified fire-stopping solution.
✅ Key Features:
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Up to 4 hours fire resistance in tested applications
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700% expansion factor, fills voids up to 80mm
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Certified to BS EN 1366-3, EN 1364-1, EN 1364-2, and ASTM E2786-10
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Water-based, low VOC, and easy to clean
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Resistant to smoke, gas, and water
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Safe for use with rigid and flexible substrates
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Compatible with FB180 Batt systems
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Not suitable for cPVC pipes
🧪 Technical Specifications:
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Colour: Graphite grey
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Skin Time: 15–30 minutes at 23°C / 50% RH
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Cure Rate: 3mm per 24 hours (depending on joint size and conditions)
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Application Temp.: +5°C to +40°C
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Activation Temp.: 150°C
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Specific Gravity: 1.46–1.54 g/cm³
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Shore A Hardness: ~60
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pH Value: 7.5–8.5
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Coverage: ~12 linear metres (6mm bead) per 310ml tube
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Shelf Life: 18 months (unopened)
⚠️ Safety & Compliance:
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Non-hazardous under CLP regulations
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Not classified as flammable
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Complies with UK COSHH and PPE regulations
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Avoid contact with skin and eyes; wear appropriate PPE during application
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Store between 5°C and 25°C, protect from frost