The Cone Calorimeter is a new generation instrument developed primarily for making rate of heat release measurements. This instrument, containing a uniform and well characterized irradiance source, was also seen to be useful for making measurements of radiant ignition on materials. Data have now been collected for a wide range of materials. The effects of various apparatus dependencies are discussed. Also, some comparative data are available illustrating the performance of similar materials in other apparatuses. Finally, for a selected material, Douglas fir particle board, a detailed comparison with an ignition model has been made.