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XICAR® Sintered Silicon Carbide Thermocouple Tubes

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XICAR® Sintered Silicon Carbide Thermocouple Tubes

Sintered silicon carbide thermocouple tubes sheaths for use in the (non)-ferrous industry.

  • Maximum temperature of 1650 °C  in air and up to 1,900 °C in a controlled atmosphere
  • Maximum length up to 3,000 mm with a maximum OD of 300 mm
  • XICAR® thermocouple protection tubes are for both direct as well as indirect temperature sensing in molten metal (e.g. furnace wall or roof) temperature reading with Type R or S elements in molten brass, copper, cast iron, stainless steel or silicon metal
  • For temperature measurements in non-ferrous launders or pouring troughs
  • Better or equal quality than HEXOLOY SE tubes.



sintered silicon carbide thermocouple protection tubeSintered silicon carbide thermocouple tubes up to 1,900°C in a controlled atmosphere.

Thermocouple protection tubes fabricated from XICAR high temperature provide outstanding performance when exposed to corrosive and abrasive conditions and high temperatures. Offering superior performance for temperature control in (non)-ferrous foundries and smelters, they are more cost-effective than other materials, such as cast iron, silicon carbide and alumina.

XICAR also has a clear price advantage over HEXOLOY SE while providing at least equal and often superior performance.

We have three standard diameters of high-temperature thermocouple protection tubes in stock with lengths varying from 150 mm to 3,000 mm. These all feature a  standard groove though we can provide bespoke items which might incur additional tooling costs.

The maximum temperature in a controlled atmosphere is 1,900 oC. The maximum application temperature in the open air is 1,650 oC

How does a Sintered Silicon Carbide Thermocouple Protection Tube work?

Courtesy of

The first person who found that if two ends of a metal were at different temperatures, an electric current would flow through it was German physicist Thomas Seebeck (1770–1831) . That’s one way of stating what’s now known as the Seebeck effect or thermoelectric effect. Seebeck found things got more interesting as he explored further. If he connected the two ends of the metal together, no current flowed; similarly, no current flowed if the two ends of the metal were at the same temperature.

Artwork showing how a thermocouple works: Two dissimilar metals joined together show the Seebeck effect at work by generating a voltage when their junctions are at different temperatures.

Artwork: The basic idea of a thermocouple: two dissimilar metals (gray curves) are joined together at their two ends. If one end of the thermocouple is placed on something hot (the hot junction) and the other end on something cold (the cold junction), a voltage (potential difference) develops. You can measure it by placing a voltmeter (V) across the two junctions.

Seebeck repeated the experiment with other metals and then tried using two different metals together. Now if the way electricity or heat flows through a metal depends on the material’s inner structure, you can probably see that two different metals will produce different amounts of electricity when they’re heated to the same temperature. So what if you take an equal-length strip of two different metals and join them together at their two ends to make a loop.

Next, dip one end (one of the two junctions) in something hot (like a beaker of boiling water) and the other end (the other junction) in something cold. What you find then is that an electric current flows through the loop (which is effectively an electric circuit) and the size of that current is directly related to the difference in temperature between the two junctions.

The key thing to remember about the Seebeck effect is that the size of the voltage or current created depends only on the type of metal (or metals) involved and the temperature difference. You don’t need a junction between different metals to produce a Seebeck effect: only a temperature difference. In practice, however, thermocouples do use metal junctions.

Xicar data sheet

XICAR® datasheet
Temperature Max 1700 °C – 1800 °C
Density > 3.10 g/cm3
Open porosity 0%
Flexural/Bending strength 20°C 320-400 MPa
Flexural/Bending strength 1300°C 360-410 MPa
Tensile strength 1950-2600 MPa
Young’s Modulus 410 GPa
Thermal Conductivity 20°C 116 W/m.k.
Thermal Conductivity 1200°C 35 W/m.k.
Coeff. Thermal Expansion 4.0 K-1×10-6
Hardness HV1 kg/mm2 2350
Acid-proof Alkaline Excellent
Thermal Shock Resistance (delta T) 600 °C
Impact Fracture toughness 4.0 MPa m½

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