Industrial furnaces are built of several kinds of high temperature (refractory) materials to hold the process material and hold in the heat without breaking down during the several months that they usually run.
Used and refurbished equipment suppliers specialize in used and refurbished equipment and instruments. Suppliers may have the personnel and/or equipment needed to completely overhaul or rebuild equipment or instruments.
Vacuum furnaces are heat-treating furnaces that use a low atmospheric pressure instead of a protective gas atmosphere. This helps to alleviate surface reactions.