Cone and furniture calorimeter tests of polyurethane foam specimens were conducted to determine theeffects of thickness of the specimen on measured heat release rates. Furniture calorimeter tests were conductedusing specimens with thicknesses ranging between 2.5 cm and 10 cm, and nominal surface areas ofapproximately 0.35 m~2, ignited in the centre, and 0.75 m~2, ignited on the edge. The growth phases of the heatrelease rate curves were similar for specimens of different thickness that were ignited in the same location.Peak heat release rate per unit thickness values ranged between 14.6 kW/cm and 18.4 kW/cm for centreignition tests, and between 16.7 kW/cm and 26.0 kW/cm for edge ignition tests. The shape of heat release ratedensity curves were similar for cone calorimeter specimens of different thickness. Average heat release ratedensity values over the period in which the foam burned were also similar, ranging between 225 kW/m~2 and274 kW/m~2.
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