Thermal Conductivity

Thermal conductivity is the property of a material to conduct heat.
Heat transfer occurs at a lower rate across materials of low thermal conductivity than across materials of high thermal conductivity. Materials of low thermal conductivity are used as thermal insulation. The thermal conductivity of a material may depend on temperature.

Calorimeter Method

The thermal conductivity of refractories is a property required for selecting their thermal transmission characteristics. Users select refractories to provide specified conditions of heat loss and cold face temperature, without exceeding the temperature limitation of the refractory. This test method establishes the testing for thermal conductivity of refractories using the calorimeter.
This procedure requires a large thermal gradient and steady state conditions. The results are based upon a mean temperature.
The data from this test method are suitable for specification acceptance, and design of multi-layer refractory construction.

Hot Wire Method

The hot wire technique is a transient, intermittent isothermal method for measuring thermal conductivity. A thin platinum wire is placed between two appropriately prepared 9" bricks of same density. Heat generated by current applied to the wire is conducted away from the wire at a rate dependent on the thermal conductivity of the material.

Hot Wire


the Model TCH-16 Hot Wire system measures the thermal conductivity of a single sample of refractory material with a thermal conductivity up to 15 W/mK at temperatures between ambient and up to 1650C in air. The 4 sample furnace (9 inch brick samples) is lined with high purity ceramic fiber and is heated with molybdenum disilicide heating elements, and controlled with a type "S thermocouple.

Operated according to ASTM C-1113

  • 1600C furnace
  • Programmable process controller
  • Sensor sytem for the Hot Wire array
  • Platinum Hot Wire Harness
  • Type "S" thermocouples,
  • computer software
  • Accessories and instruction manual. (Computer not included.)
Model  :  TCH-16
Warranty  :  12 Months
Temperature Range  :  RT to 1,650C
Furnace  :  Side load, box furnace
Thermocouples  :  Type "S" 2 wire
Samples  : x4 channels
Max Sample Size   :  9 inch Brick
Heating elements  :  molybdenum disilicide x10
furnace Power control  :  4-20ma SCR
Power controls  :  inlclude E-Stop
Temperature Control  : User Programmable, PID Controller
Heating Rate  : 1 to 30C/minute
Power Requirements  :  240vac/70amp 50/60Hz
Data Acquisition  :  Software included
Data Analysis  : Software included
Computer Interface  :  Ethernet
Overtemp  :  Included
Electrical Resistivity :   Optional
Appoximate weight  :  1323 lbs (600kg)
Furnace Footprint Length x Depth x Height    :  40 x 37 x 72 (102 x 94 x 183 cm)



The Orton C201 Thermal Conductivity Apparatus is a system to measure the heat flow through a refractory using a water-cooled calorimeter. The test sample size requirements are (3) 9 straight brick and (6) 9 x 2.5 x 2.25 soap bricks. (total of 9 straight bricks required)

Operated according to ASTM C-201


  • 1500C Furnace
  • Type 'T' Thermopiles
  • Copper Calorimeters
  • Water pump
  • 4 channel flowmeters
  • Type "S" thermocouple,
  • Accessories and instruction manual. (Computer not included.)

Model  :  C201-1500
Warranty  : 12 Months
Temperature Range :   RT to 1,500C
Furnace  : Split box, SiC elements in top
Thermocouple  :  Type "S" 2 wire
Furnace Chamber  :  IFB
Furnace Lid  :  1600C fiber
Water Pressure  : 5-10 PSI regulated
thermopiles  :  type "T"
Millivolt Resolution  :  0.01mv
Water tank  :  optional
Ice Bath  :  optional
Process Controls  :  optional
Water chiller/reciruclator  : optional
Power Requirements  :  240vac/70amp, 50/60Hz
Data Acquisition  : Manual
Data Analysis  :  Manual
Computer Interface  :  n/a
Sample thermocouples  :  not included
Back-up water line  :  plumbing included
Approximate weight  : 800 lbs. (363 Kg)
Footprint Length x Depth x Height  :  40" x 37 x 61 (102 x 94 x 155 cm)