👀 6 people are viewing this product
× National Flues
Free Delivery on Orders £100+
100% 5* reviewed on Trustpilot
Free stove flue design service
Delivery to mainland UK
Call for help on 01670 206999

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. Its superior resistance to temperatures up to 300°C and quick curing properties make it a trusted choice when sealing fireplaces, ovens, and kitchens. Whether you ref Read more...
The price you pay today £18.99
Give us a call if you find it cheaper and we'll normally price match.

 

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
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Monday, June 30th. This is based on current delivery times for this product. Delivery for products not in our warehouses can be delayed because of third party carriers. If you need a stove, or other bulky product, to be delivered by a specific time in the next 7 days then please give us a call. We can sometimes reduce longer lead times if we pay the carrier £25 for express delivery. Visit our Shipping Information page for more information.

Warranty & Returns +

All our products come with warranties and you can read in our blog about they types and terms and conditions for warranties. Mi-Flex flue liner, for example, comes with a lifetime guarantee. Give us a call if you want to know about a specific warranty. Returns for damaged items are covered by insurance; non-damaged returns incur return delivery costs.

Price Match Guarantee +

We will match any price, like-for-like, on a retail basis. Give us a call if you find it cheaper and want to buy from us.

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: [email protected]

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

Technical Specifications
Product NameGREY Fortafix HT Flexseal Silicone - 300ml Cartridge
Size310ml cartridge
Temperature ResistanceUp to 300u00b0C
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.

Your recently viewed products:

Multiple Payment Options- including Klarna, Clearpay, Mastercard, Visa and Paypal