Moisture & Carbon Dioxide Resistant

Customers can be assured that none of our products include sodium silicate. We believe this material to be inherently flawed because its performance degrades on exposure to moisture in the atmosphere and additional protection is required at the fitting stage to ensure that cut ends and any other splits etc. are sealed air-tight. Intumescent Seals incorporate unique intumescent compounds which are based instead on expandable graphite and specialised binding materials. Besides being moisture resistant (avoiding the cost of addition protection) Intumescent Seals do not degrade on exposure to carbon dioxide.

High Volume & High Pressure Foam

Because the expandable graphite in Intumescent Seals produces a voluminous foam to fill the door leaf to frame gaps and those between door leaves in double door assemblies under relatively high pressure, it helps to stabilise fire door assemblies as they move under increasing heat. This makes Intumescent Seals especially suitable for use at the head of unlatched fire doors and in double door assemblies. (See graphs.)

High Temperature Tolerance

The compounds used in Intumescent Seals are tolerant to very high temperatures and can cope with steel fire doors where conventional intumescent materials may break down. Although the benchmark BS 476 test exposes specimens to approaching 1000 degrees C, many real fires reach temperatures in excess of 2000 degrees C. Intumescent Seals are not simply designed to get through standardised tests - they are made to cope with the more demanding challenges presented by real life fires.

Flexible Solutions

Whether you are looking for seals to protect a circular or other curved glazing apertures, tight corners or other application requiring a flexible intumescent product, we have a wide range of options to choose from where a conventional sealing strip would be impractical. For more specific advice, please contact our Technical Department.