1200 Series

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The most reliable and widely used lab furnaces available today, the CM 1200 Lab Box Furnaces offer controlled heating and cooling rates, uniform temperature control, compactness, and sturdy construction for long term use. Configurations are available for virtually any requirement with three basic configurations including front loading, bottom loading and front loading atmosphere retort. Thermal cycling systems, as well as custom designs and specialized control systems are offered.

The 1200 Series furnaces incorporate a graded insulation package using high purity alumina fiber. These furnaces will not hot spot at high temperatures and are resistant to degradation. The double wall shell construction allows the fan cooling feature to maintain reduced skin temperatures while keeping the element terminals cool. The heating elements consist of Kanthal A1 wire embedded in ceramic plate heaters. The elements are kept independent of the furnace insulation for more efficient operation and much longer life than vacuum formed element/insulation combinations. Four-sided heating is offered to ensure uniform temperature control. The Kanthal A1 alloy in these elements is very durable at high temperatures, due to the formation of a protective oxide layer formed by reaction with the oxygen in air.

The 1200 Series Control and Power Supply console includes all components required for immediate installation and operation. Proper control of Kanthal A1 plate heaters requires a zero-crossover SSR, firing indicating light, circuit breaker and a multiple segment programmable control such as Honeywell or Eurotherm used in conjunction with a Type “N” thermocouple.

The atmosphere retort configuration includes a high quality nickel alloy retort with gas inlet and outlet ports located through the rear wall of the furnace and a water-cooled o-ring sealed front door with positive latching. Both inert and reducing atmosphere systems are offered. CM Furnaces’ time-tested hydrogen atmosphere safety package includes a gas burnoff with dual electric ignitor system, process and safety gas pressure sensors, automatic switching of atmospheres and automatic shutdown with alarms. The retort system maximum use temperature is 1125°C (2060°F).


  • Double Shell Construction
  • High Purity Alumina Fiber Insulation
  • Heating Elements consisting of Kanthal A1 Wire
  • Embedded in Ceramic Plates
  • Cubed Chamber for Best Uniformity
  • Fan Cooling of Element Terminals
  • Type “N” Thermocouple
  • Programmable Ramp and Soak control
  • Zero-Crossover SSR Power Controller
  • SSR Firing Indicator Light
  • Separate Controls/Power Supply Console
  • 10’ Interconnecting Wire and T/C Extension Leads


  • Ceramics
  • Glass
  • Powders
  • Laboratory Research
  • Materials Testing
  • Thermal Cycling
  • Brazing
  • Heat Treating
  • Melting
  • Annealing
  • Firing
  • Sintering
  • Cleaning
  • Reducing


  • Front Loading Box Furnace (FL)
  • Bottom Loading Box Furnace (BL)
  • Atmosphere Retort Box Furnace (FL)
  • Thermal Cycling Box Furnace (BL)
  • Custom Materials Testing Configurations

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