This pack contains enough lengths of intumescent strip for a full door. The strip comes supplied with a brush seal and is suitable for a fire and smoke doors.Rapid high-pressure multi-directional expansion.Mineral based: safe to handle, containing no fibrous material or harmful chemicals.Unaffected by moisture, humidity, atmospheric pollution and other common industrial and household chemical substances.Laboratory ageing tested for 100 years.Supplied with self adhesive backing for ease of installation.