The flow of convective heat must consist of two Meker-Fisher burners secured under the stand supporting the sample and placed at a 45º angle with respect to the vertical axis so that the flames meet at a point just under the sample. The radiant heat source must consist of some T-150 quartz infrared tubes and be centred between the burners. Once the total heat flow reaches 83 kW/m² ± 4 kW/m², a copper calorimeter should be used to measure the total heat flow. Prior to the test, the copper calorimeter must be used to measure the heat flow by placing it upside down and directly exposing it to the total heat source. The reading on the calorimeter must register for at least 10 seconds. The lowest temperature on the curve must be chosen and the temperature increment determined for 10 seconds (detected by a sensor). The start point for the exposure should be registered at time t = 0 seconds. Exposure must continue for 30 seconds (exposure time t = 30 seconds). For each TPP test, the final thermic point must be determined by comparing a few graphs that show the thermic energy measured versus the response time on the Stoll curve (a prediction model for second-degree burns on the human body, expressed in J/cm²).