mcr Sil-MU - intumescent seal

The mcr Sil-MU seal is designed to be used wherever reduced mechanical strength is required, e.g. on wood, steel and aluminium fire doors, fire doors for special areas of application, as well as for ventilation and smoke exhaust ducts, cable ducts, the sealing of windows, facades and others.

The mcr Sil-MU intumescent seal is made of hydrated calcium silicate reinforced with glass fibre, covered with a layer of epoxy resin on both sides. It is activated in temperatures between 100°C and 120°C to form a rigid, non-combustible foam which provides a high level of thermal insulation. It expands in one direction to at least five times its original thickness. The swell pressure generated in the process may reach 1.5 N/mm2. This provides an effective barrier to escaping flames, smoke and hot gases around the circumference of the component, where the seal is installed.

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  • very quick and easy installation



Product Type

intumescent gasket

Reaction to fire

A2 class non-flammability


rolled strips with a total length of 2,100 mm long, 30 mm wide and 2 mm thick


length 2,100 mm / width 30 mm ± 0.5 mm / thickness 2 mm ± 0.4 mm




Swelling height (10 minutes at 550°C under fire load)

>5 x original height

Swelling pressure

≥ 0.9 N/mm2

Thermal conductivity at 20°C

0.8 W/mK

Water content

from 25% to 40% by weight

Areal weight (average)

3.0 kg/m2

  • Production halls and warehouses
  • Logistics centers
  • Public buildings
  • Commercial buildings
  • Residential buildings

The surface to be protected with the mcr Sil-MU seal should be clean and dry. Remove any loose paint from the surface.

The seal can be fixed by gluing, but also with the use of a double-sided adhesive tape or any mechanical fasteners.


Store in a dry place at temperatures of –20°C to +40°C.