Thermal Conductivity


Fast, easy, and highly accurate. A single-sided, “plug & play” sensor suitable for testing solids, liquids, powders and pastes. Offers maximum sample versatility. Conforms to ASTM D7984.

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Sheathed in stainless steel, the TLS Needle sensor offers maximum robustness in thermal conductivity testing. Conforms to ASTM D5334 and D5930.

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A flexible double-sided sensor available in different sizes. Greater control over experimental parameters makes TPS ideal for more advanced users. Conforms to ISO 22007-2 and GB/T 32064.

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How it Works

C-Therm's Trident system offers three different modes of operation in measuring the thermal conductivity of materials. The MTPS high precision method is the simplest and most versatile. The TLS Needle method provides maximum robustness for those sticky situations. The Flex TPS method provides the greatest flexibility over experimental parameters with C-Therm's flex sensors. Learn more about how each method works below.

  • MTPS
  • TLS Needle
  • Flex TPS


Test Methods MTPS TLS Needle Flex TPS
Recommended applications Aerogels, Automotive, Batteries, Composites, Insulation, Explosives, Geological, Liquids, Metals, Nanomaterials, Metal Hydrides, Nuclear, Phase Change Materials (PCMs), Polymers, Rubber, Thermal Interface Materials (TIMs), Thermoelectric Polymer Melts, Semi-Solids, & Soil.


(Not suitable for lower viscosity fluids due to convection.)

Cement/Concrete, Metal Sheets, Polymers, Porous Ceramics, & Thin Films
Thermal Conductivity Range 0 to 500 W/mK 0.1 to 6 W/mK 0 to 2 000 W/mK
Thermal Diffusivity Range 0 to 300 mm²/s* Not applicable up to 1 200 mm²/s
Heat Capacity Range up to 5 MJ/m³K* Not applicable up to 5 MJ/m³K
Thermal Effusivity Range 5 to 40 000 Ws½/m²K Not applicable Not applicable

Temperature Range

-50 ºC to 200 ºC


With option to extend to 500ºC

-55 ºC to 180 ºC


With option to extend to 300 ºC

-50º to 300ºC
Precision Better than 1 % Better than 3 % Better than 2 %
Accuracy Better than 5 % Stated for 20 °C
± (3 % + 0,02) W/mK
Better than 5 %
Test Time De 0,8 to 3 seconds 1 to 4 minutes 10 to 180 seconds
Sensor Size 18 mm diameter 150 mm length Capteurs de 6 mm, 13 mm and 30 mm diameter sensors available
Minimum Sample Size Solids :
Min. diameter of 18 mm Min. thickness is dependent on the thermal conductivity. For materials under 1 W/mK a min. thickness of 1 mm is suggested.


Liquids & Powders :
1,25 mL

80 mL Requires two identical samples.


The diameter of the samples should be 2.5X sensor diameter (e.g. 6 mm sensor requires sample diameter of 15 mm)

Thickness should be at minimum the same diameter as the sensor (e.g. 6 mm sensor requires 6 mm thick samples).

Maximum Sample Size




International Standards ASTM D7984 ASTM D5334D5930, and IEEE 442-1981 ISO 22007-2GB/T 32064


The C-Therm software is developed for the Trident system to control all 3 sensor types. The software is highly user-friendly and easy to navigate. It provides full data acquisition and analysis in one software.

logiciel C-Therm