Muffle Furnaces: What Are They Used For? These furnaces are meant to provide a controlled atmosphere in which the scientists and researchers can work. Muffle ovens are also useful, because they can achieve high temperatures without the risk of flames or smoke. That is highly useful for experiments that require consistent conditions. For instance, when researchers are looking to melt metals or dry some materials, muffle furnace oven provides them with the heat they need without distractions. Heat inside these ovens is perfectly uniform, so that every part of what’s inside gets the same temperature. This ensures that experiment results are true and accurate.