Determination of various physical characteristics of different materials and products at elevated temperatures may be carried out by heating the test specimens to the appropriate temperature inside
a constant temperature air oven and determining the required characteristics with the specimens kept under the same temperature. For this purpose the equipment needed for conducting the
determination can either be kept inside the oven along with the test specimens, or, if this is not feasible because of certain constrains, by taking the heated specimens out from the oven and
conducting the test in still air within the shortest possible span of time.