Small gaps and cracks around doorways incorporating fire doors create a weakness in the integrity of the fire compartment which can be protected by using Sealmaster Intumescent Plaster.

Intumescent Plaster is a chemically modified surface coating and space filler, which is supplied as a two-part powder for mixing prior to application. It can be trowel-applied like other fillers and sets hard in 12 hours. It has excellent non-shrink characteristics and can be overpainted once set.

Intumescent Plaster mat be used to fill over-large lock or latch recesses in timber doors. It is a versatile gap filler also used to seal small holes around pipes, etc. where Intumescent Compound may not be applicable.

It is resistant to atmospheric moisture and provides a durable barrier between masonry and timber frames. On activation under intense heat the plaster carbonises and the intumescent action prevents the passage of flames and smoke.

Intumescent Plaster has achieved a 60 minute rating in tests by TRADA.