Keeping the heat inside of the furnace can speed production, save energy, reduce cost and improve product quality. The best way to keep most of the heat inside of the furnace is to use an efficient insulation material. The type of insulation chosen depends largely on the temperature inside the furnace. Industrial furnaces are, at the very least, lined with refractory brick and then backed up with an insulator such as ceramic fibers. In recent years, a more efficient insulation is being used which can improve process time, increase capacity and decrease energy consumption (and energy bills).