Free Delivery over £100+ 5on Trustpilot Browse our popular stoves Fast Mainland UK Delivery Buy stoves with install packs Call 01670 206 999 for help

GREY Fortafix HT Flexseal Silicone - 300ml Cartridge (93-HTFS-G)

The GREY Fortafix HT Flexseal Silicone - 300ml Cartridge is the ultimate high-temperature sealant designed for sealing, bonding, and repairing applications in harsh environments. Ideal for both industrial and domestic usage, this versatile silicone sealant from Fortafix stands out among high-performance sealing solutions in the UK. Read more...
GREY Fortafix HT Flexseal Silicone - 300ml Cartridge
IN STOCK
Product Thumbnail
Now only £15.99
Give us a call if you find it cheaper and we'll normally price match.
  • Fast deliveryFriday, November 14th*
  • Best PriceCall us to beat any price you found online.
  • Secure checkoutCard· Google/Apple Pay· Klarna· Paypal

 

Payment Options

At a Glance

  • High-temperature resistance up to 300°C
  • Fast-curing, resilient and flexible bond
  • Suitable for a range of surfaces including metal, glass, and ceramics
  • Ideal for high-heat applications such as fireplaces, ovens, and kitchen installations
  • Generous 310ml cartridge provides extended usage

We Won't Be Beaten On Price

At National Flues, we continuously monitor competitor prices. This ensures that we consistently offer you the best deals on all our products. Here’s how we keep your costs low:

  • Daily Price Matching: Our team adjusts prices to ensure we stay competitive.
  • Bulk Purchasing Power: We sell a lot, so we can negotiate better rates with suppliers, passing the savings directly to you.
  • Operational Efficiency: We have streamlined processes to reduce overhead.

Price Match Guarantee: If you find the same product cheaper within 48 hours, we’ll match it and refund the difference.

Free Delivery Over £100: Orders over £100 are free delivery (call us if delivery is required outside the mainland UK).

“I saved 20% on my purchase compared to other retailers. Exceptional service!” – Jane D.

Have Questions?
Phone: 01670 206999
Email: sales@nationalflues.com

The GREY Fortafix HT Flexseal Silicone - 300ml Cartridge is a versatile, high-performance sealant designed to withstand temperatures up to 300°C. This flexible silicone-based sealant is essential for sealing and bonding applications in high-heat environments. With a generous 310ml tube, it ensures you have enough product for your projects.

It cures quickly to form a resilient, yet flexible bond, making it ideal for a variety of applications, including fireplaces and kitchen installations.

SKU: 93-HTFS-G

Delivery Information* +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Friday, November 14th. This is based on current lead times. Bear in mind that it is a busy time of year. If you need a product delivered by a specific time in the next 7 days, then please give us a call on 01670 206 999. Visit our Shipping Information page for more information.

About National Flues Ltd +

We began over 30 years ago as a fireplace shop in the North East. We now supply hundreds of trade professionals and thousands of retail customers, all across the UK, every month. We are still a family owned business, lead by the MD Neil, and always try our best to deliver the best possible experience. We also price match, so give us a call if you find this cheaper and want to buy from us. Visit our about us page to read a bit more.

This is us — real advice over the phone, or at the counter, and real stock in our warehouse.

Customer being served at the National Flues trade counter
Trade counter Installer collection & same-day help.
Team helping customers at the counter
Advice Real people on the phone to spec the right parts.
Friendly member of the team at the front desk
Here to help Friendly, straight answers from HETAS approved experts.
Warehouse shelves with boxed flue components being picked for dispatch
Warehouse Orders picked & dispatched nationwide.
Talk to the team Visit our trade counter
Technical Specifications
Product NameGREY Fortafix HT Flexseal Silicone - 300ml Cartridge
Size310ml cartridge
Temperature ResistanceUp to 300°C
Curing TimeApproximately 24 hours for full cure (varies with temperature and humidity)
Application SurfacesMetal, glass, ceramics, and various construction materials
Sealant Colour When CuredGrey
PackagingCartridge
Before application, ensure the surface is clean, dry, and free of dust or grease. Apply the sealant evenly using a suitable applicator, ensuring thorough coverage at the joint or gap. For best results, allow the product to cure undisturbed for at least 24 hours. Always follow best practices for high-temperature sealing and ensure proper ventilation during application. Avoid using on surfaces that may not bond properly with silicone. Caution should be taken around sensitive materials where the adhesive properties might be too strong. Read all instructions provided on the cartridge and wear appropriate personal protective equipment during the application process.

This sealant can be applied to a variety of surfaces, including metal, glass, and various construction materials, making it highly versatile.

The curing time can vary based on the temperature and humidity, but generally, it takes around 24 hours for a full cure.

Yes, once cured, the silicone sealant is waterproof and can withstand conditions of high moisture and humidity.

Yes, due to its high-temperature resistance, it is suitable for use in kitchens, including around ovens and stovetops.

While applying, it may have a slight odour, but it dissipates quickly as it cures.

The sealant cures to a grey colour, which complements many industrial and domestic applications.

Absolutely! It's user-friendly and can be effectively used by both professionals and DIY enthusiasts.

 

Call the Experts   8am-5pm
👀 6 people watching this