Rigid graphite intumescent fire and smoke seal, twin centre fin

An intumescent seal for the gap between leaf and frame of steel and timber fire doors. In a fire the strip expands and closes the gap, holding back smoke, toxic gas and heat and slowing the spread of fire. It is glued into a groove in the frame or the leaf edge; the mill can supply it with adhesive backing, or it can be fixed into the groove with small pins.

Intumescent graphite core in a rigid brown casing, with two soft black fins at the centre of the face. The mill lists it as a fire, smoke and acoustic seal. Thickness x width (mm): 4x10, 4x15, 4x20, 4x25, 4x30, 4x38, 6x10, 6x15, 6x20, 6x25, 6x30, 6x38, 6x40. Bars of 2100 mm. The catalogue prints no activation temperature, expansion ratio or fire test certificate.