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Box Furnace

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A box furnace is a square or rectangular shaped furnace used for a wide variety of industrial and laboratory applications. Box furnaces can achieve very high temperatures and most utilize automated temperature control systems to maintain the heat levels in their chambers within just a few degrees, even over long work periods.

Box Furnace Company Links

  • Carbolite produces a broad range of box furnaces. They manufacture a full line of box furnaces in twelve temperature classes—from 750°C to 1700°C. Carbolite’s box furnaces are available in a number of configurations and multiple chamber sizes to accommodate the needs of any high-temp application.

Box Furnace Applications

Generally, box furnaces are relatively simple and conservatively designed. This makes them a very versatile choice for high temperature furnace applications. Box furnaces are typically used for: 
  • Heat treating
  • Thermal aging
  • Enameling
  • Bonding
  • Sintering
  • Burn-off
  • Asphalt binder analysis

General Box Furnace Specifications

Box furnaces are capable of reaching temperatures up to 1700°C and higher. They typically employ high efficiency heating elements and low thermal mass insulation, a combination which helps maintain uniform temperatures throughout the work chamber. Single or multiple zone heating chambers are available on some models. Modern box furnaces utilize digital controls to ensure precise temperatures and easy operation. Many include energy efficient hold-temperature settings that can maintain full temperature inside the work chamber while using only a fraction of the furnace’s maximum power. Electric furnaces are the most common, but some gas-fueled box furnace models exist, as well. Box furnaces employ a number of safety features to ensure operator and environmental safety. Many use double shell construction to keep outer case temperatures low, even at the highest internal temperature settings. Positive break safety switches which cut power to heating elements when the chamber door is opened are also common. Many box furnaces also feature vertical-lift doors to keep hot inner-chamber surfaces away from operators.

See also: Tube Furnaces