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Mapei Mapeflex Firestop 1200°C High Temperature Sealant Grey 300ml

Product Code: 25153

300ml. For rigid seals in voids and joints between materials that come into direct contact with flames or need to withstand temperatures up to 1200°C. Suitable for industrial furnaces, wood burning ovens, barbeques, chimney flues and fireplaces.

  • Odourless
  • Solvent Free
  • Accommodates Movement of
  • Rapid Drying
  • Suitable for Materials in Direct Contact with Flames
  • Ideal for Pre-Manufactured Elements
  • View more information

Covers 3m per 300ml.

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Safety Data Sheet (COSHH)




QtyPrice per item
1 - 2 £10.99 (£36.63/Ltr)
3 - 5 £9.89 (£32.97/Ltr)
6 + £8.79 (£29.30/Ltr)

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Rated 2 out of 5 by Out of Date After struggling to use a lumpy dry product it became apparent I had been sold a 3 month out of date product. 13 Nov 2015
Rated 1 out of 5 by Not great Having read the product spec I thought this would be perfect for sealing up around the register plate of my stove and some joints around the cement board surround. I have however found it does go brittle and fall out of the joints after just one hot burn. Perfect if your stove is an ornament, worthless otherwise. 14 Feb 2015
Rated 3 out of 5 by Sticks well ok so this is expensive for a sealant but it is rated up to 1200 degrees C I used it to build an oven using 12mm cement board for a home made vacuum former, the oven is suspended in the air and this sealant holds the boards in well, the oven is fairly large (833mm x 625mm) and it holds a sheet in that size well so far. when using it with a sealant gun it some times feels like it gets blocked to you put a little more pressure on it and you get a big glob of it come out which is annoying and messy. it would have been nice for it to flow easily out in a controllable bead which it sometimes does. 16 Jan 2015
Rated 5 out of 5 by ++++High Temp Sealant Great High temp sealant for ideal for stoves and flues. I have just used it to replace a 250/300max deg c sealant on all the joints on a newly installed log/coal burning stove. Previous sealant lasted three small fires. This was easy to apply and we have had the fire running at max efficiency 500degc with no issues now for 8 fires with no sign of cracking or break up. Great high temp sealant ideal for fires flues and boiler chambers. It would be nice if it came in other colours but was easily over sprayed. 26 Dec 2014
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2 Nov 2015
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New Radnor
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, Electrician
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Mapei Mapeflex Firestop 1200°C High Temperature Sealant is designed as a rigid refectory mortar to be applied between gaps in porous surfaces such as brickwork in areas that are exposed to high temperatures. This product is not a flexible sealant and therefore should not be applied to surfaces that may expand and contract such as metal.
13 Nov 2015
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Download more info (pdf)

Brand Mapei
Colour Grey
Manufacturer Guarantee 5 years
Model Name Mapeflex Firestop
Model No 4697091SFX
Pack Size 1
Product Diameter 175 mm
Product Height 230 mm
Product Type 1200°C High Temperature Sealant
Product Width 48 mm
Sealant Adhesive Volume 300 ml
Total Product Weight 0.557 kg