High Temperature Silicone Sealant 1500°C Black | Heavy Duty Heat Resistant Fire Cement & Flue Sealer | For Wood Burner Stoves, Chimneys, Ovens & Fireplace Repair | Professional Grade Cartridge (310ml)

Restore the Safety and Efficiency of Your Heating System with Professional-Grade 1500°C Sealing Power.

When the integrity of your wood burner or flue is at stake, standard sealants simply aren't enough. The extreme thermal shock, corrosive flue gases, and direct flames of a solid fuel fire demand a specialised solution. Our High Temperature Silicone Sealant (1500°C) is a heavy-duty, silicate-based compound engineered to bridge the gap between industrial performance and DIY simplicity.

Why Choose 1500°C Over Standard Silicone?

Most "heat resistant" silicones sold for automotive use fail at 300°C. They turn brittle, peel away, or degrade into a gummy mess, risking smoke leaks. Our formula is different. It is rated for 1500°C (2732°F). Instead of burning, it vitrifies—turning into a rock-hard, ceramic-like material that effectively welds itself to the surface. This creates a permanent, gas-tight barrier against carbon monoxide and smoke, ensuring your family's safety and your stove's efficiency.

Versatile & Robust Application

Designed for static (non-moving) joints, this sealant offers unrivalled adhesion to the materials found in your hearth.

• Flue Systems: Seal the gap between the stove spigot and the flue pipe, or bond flue liners to register plates.
• Firebox Repairs: Fill cracks in firebacks, re-set loose firebricks, or seal gaps in pizza ovens and chimineas.
• Assembly: Ideal for cementing ceramic rope or sealing stove glass into cast iron doors.

The "Professional's" Finish

We understand that aesthetics matter. The sealant applies as a smooth black paste, allowing for precise tooling. Upon firing, it cures to a matte dark grey/charcoal finish that blends naturally with cast iron and matt black flue pipes, leaving your installation looking clean and professional.

Application Masterclass for Best Results:

To ensure a crack-free cure, ensure all surfaces are clean and free of rust. Crucial Tip: If applying to porous brick or clay, lightly mist the surface with water first to prevent the sealant from drying too quickly.

After the final solidification, slowly heat the sealant up to +250 °C. As the result of heating, the mass will turn dark grey and become extra-hard.

Technical Specifications:

• Max Temp: 1500°C
• Cure Type: Rigid / Hard
• Colour: Black (Paste) -> Dark Grey (Cured)
• Size: 310ml Cartridge (Fits standard gun)

• EXTREME HEAT RESISTANCE UP TO 1500°C: Engineered for the harshest environments, this silicate-based formula withstands direct flame and continuous temperatures of 1500°C (2732°F). Far superior to standard red automotive silicones (max 300°C), it is the ultimate solution for sealing joints in wood-burning stoves, multi-fuel fires, pizza ovens, and industrial flues.
• PERMANENT "STONE-HARD" VITRIFICATION: Unlike rubbery gaskets that degrade, this sealant cures to a rigid, rock-hard ceramic mass. Through a unique vitrification process, it bonds physically with masonry and metal to form a hermetic, smoke-tight seal that prevents dangerous carbon monoxide leaks and maintains flue draught efficiency. Note: Designed for static joints; does not remain flexible.
• SUPERIOR ADHESION TO MULTIPLE SURFACES: formulated to bond aggressively to cast iron, mild steel, stainless steel, firebrick, concrete, stone, and clay. Perfect for sealing flue spigots, fixing loose firebricks, bonding ceramic glass tape, and sealing register plates.
• PROFESSIONAL GREY/CHARCOAL FINISH: The thixotropic (non-slump) paste applies black and cures to a discreet, matte dark grey/charcoal that blends seamlessly with cast iron stoves and flue pipes. This ensures invisible repairs that maintain the aesthetic of your hearth.