C-Therm’s non-destructive sensor technology uses one-sided, interfacial reflectance to measure thermal properties. This approach allows C-Therm sensors to offer unique testing capabilities not readily available through other methods:

  • Testing different orientations or principle axes of a sample
  • Testing a sample in multiple locations
  • Evaluating different degrees of penetration of a sample
  • Seeing through outside layers into inaccessible areas of a sample

For specific information on C-Therm sensors and testing products, click here.

Testing Different Orientations of a Sample

Materials can have significant variations in thermal characteristics based on orientation. C-Therm sensors have the ability to assess multiple sides of the same sample. This can help identify orientation and position-dependant fluctuations that can impact material performance. To view a specific Technical Paper on this topic (“Orientation and Position Dependant Thermal Conductivity”), click here and type "orientation" into the KEYWORD field.


C-Therm sensors allows the testing of materials from 3 dimensions of the same sample, a unique capability that can help identify variances in thermal properties based on orientation or position.

Testing A Sample in Multiple Locations

Due to its non-destructive, non-invasive nature, the C-Therm sensor technology permits sample testing in multiple locations. Grid testing allows accurate detection of homogeneity variations, particularly in compounds or products that use fillers, such as graphite, boron nitride or nano-materials, to enhance material properties. The capability of testing a grid size as small as 5 x 25 mm allows C-Therm sensors to evaluate dispersion characteristics of filler material and detect problems such as settling, bleeding and irregular distribution. To view a specific Technical Paper on this topic (“Thermal Conductivity, Homogeneity and Topography Characterization”), click here and type "Thermal Conductivity" into the KEYWORD field.

Test grids with mesh sizes as small as 18 mm diameter are possible with C-Therm sensors, allowing a single sample to be evaluated for homogeneity over its entire surface.

Evaluating Different Degrees of Penetration of a Sample

When testing the thermal conductivity using methods such as guarded hot plate, the results represent an average value for the sample. C-Therm's development of the modified transient plane source technology resulted in sensors that can provide insight into different depths of a material being tested. By varying the test time, different degrees of sample penetration can be evaluated – a capability that allows accurate structural characterizations of materials. To view a specific Technical Paper on this topic (“Thermal Penetration Times as a Nondestructive Measure of Orientation in Polymide Film”), click here and type "orientation" into the KEYWORD field.


By varying test times, the thermal properties of a sample can be evaluated at different depths. This allows more precise characterization of the material being tested and determination of is homogeneity.

Seeing Through Outside Layers into a Sample

A unique capability of C-Therm sensor technology is its ability to “see through” the exterior layers of a sample to test the thermal properties of inaccessible areas – even if that exterior layer is comprised of a different material. This simplifies the evaluation of liquids, for example, which can be contained in a plastic bag for liquid testing. The interior of finished products that have exterior covers or coatings can also be tested without destroying or damaging the product. To view a specific Technical Paper on this topic (“Implementation of Rapid Nondestructive Thermal QC Test for Vacuum Insulation Panels for Appliance Manufacturing”), click here and type "materials" into the KEYWORD field.


The nature of C-Therm's innovative sensors allows them to “see through” exterior layer of a sample into areas of a product that are not accessible without destroying the item being tested.