In the event of fire the point on a timber fire door most likely to suffer failure is the gap between the door and its frame. Intumescent fire seals swell when exposed to hot gases and flames thus providing suitable protection. If doors are required to prevent the passage of smoke in the early stages of a fire, the intumescent seal must be supplied with a brush pile that acts as a smoke seal.These seals contain a graphite intumescent core, which features extremely rapid multi-directional expansion in the event of fire. The intumescent core is encased within a rigid PVC sleeve which has a self-adhesive backing. The sleeve acts as a casing and provides the necessary protection from day to day wear and tear. The product has a life expectancy in excess of one hundred years as indicated by laboratory ageing tests. There is no performance degradation due to moisture, humidity or atmospheric pollution. The product is mineral based and safe to handle containing no glass fibre or harmful chemicals.