Top Tier Fire Protection; New Flamex MS320 sealant

Top Tier Fire Protection; New Flamex MS320 sealant

Posted on 9 November 2023 at 15:15

Top Tier Fire Protection; New Flamex MS320 sealant

Fosroc UK & ROI is introducing an exciting new one-part fire rated sealant for trafficable fire protection.

What is Flamex MS320 for?

This highly effective product has been developed to seal and protect contraction and expansion joints within stadia terracing, floors, curtain walling and building facades.

Why is Flamex MS320 better?

Traditionally, one product was applied for its trafficable properties, followed by another to provide fire protection. But now, the functionality of these two products have been combined as a simple one-part solution in Flamex MS320. This new product has outperformed equivalent competing products in lab testing to BS EN 1366-4, based on superior insulation and integrity for fire resistance and elasticity for robustness. Its twin seal solution ensures fast and easy application, eliminating the need for a secondary product.


  • High Shore A hardness
  • Robust with high elasticity under tensile strain
  • Excellent adhesion
  • Up to a five-hour fire rating in specified joint configurations*
  • Easy to apply – can be applied to concrete or mild steel substrates
  • Cures quickly
  • Slump resistant - perfect for vertical and horizontal joint applications
  • UKCA marked

*compared to 4 hours in leading competitor equivalent product

Green Tick

As one of Fosroc’s 2023 sustainability pledges, the entire sealant range, including Flamex MS320, is now supplied in foil sachets to reduce the volume of waste caused by plastic cartridges. Additionally, as Flamex MS320 is a one-part product, further reducing packaging volume.

How does it work?

When cured Flamex MS320 is burning, the fire retardant causes a layer of intumescent char to form on the surface of the sealant. The char layer swells due to heat exposure and prevents further burning of the sealant, allowing the Flamex MS320 to withstand fire exposure for up to five hours.

Want to know more?

If you’d like to learn more about the Flamex MS320 or you have an enquiry, send your enquiry to [email protected] or contact us on 01827 262222. 

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