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Box and ashing furnaces are designed for high temperatures. These furnaces can go to 1800 C or 3300 F. To withstand these temperatures requires refractory material. The ashing furnace comes with a vent to let moisture escape to the atmosphere.
To keep the outside temperature of these furnaces at a reasonable level and keep a uniform internal temperature, the electrical energy consumed is high. Therefore the internal dimensions and internal shapes of the furnaces are small and more closely designed to a specific function or application than laboratory ovens.
