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    Thermal Conductivity of Solids

    There are a number of accurate methods for measuring the thermal conductivity of solids. For highest accuracy, absolute methods are preferred as they offer the least uncertainty in the measurement. In selecting an appropriate method, there are a number of other considerations, such as thermal conductivity range, surface, sample size, and temperature.

    Thermal Conductivity Customer Comment TPSMethod Used:
    Hot Disk TPS

    Corson Cramer

    Colorado State University

    “Thermtest’s knowledge and equipment is world class. They helped me by understanding my specific needs of my project and developed a solution for testing my unique samples that I could not have done anywhere else. The people at this company are a pleasure to work with.”

    Hot Disk Transient Plane Source

    The Hot Disk is one of the most versatile methods of measuring thermal conductivity. As the method is absolute, the contact resistance between sensor and sample is able to be removed and the true value tested. With this capability materials of varying surface finish are able to be tested. There are a number of sensor sizes to accommodate different sizes samples. The method also has the ability to measure anisotropic materials.

    Materials Solids, Liquids, Paste and Powder
    Thermal Conductivity Range 0.005 to 1800 W/m•K
    Directional Measurement Bulk, Through-thickness and In-plane
    Temperature Range -160°C to 1000°C
    Accuracy, Repeatability 5%, 2%
    Standard ISO/DIS 22007-2.2

     

    Thermtest Heat Flow Meter

    The Heat Flow Meter is universally used for the thermal conductivity measurement of foams and heterogeneous materials. The strength lies in the ability to test large samples, which is critical for the measurement of non-homogenous samples.

    Materials Solids and Loose Materials
    Thermal Conductivity Range 0.001 to 0.5 W/m•K
    Directional Measurement Bulk
    Temperature Range -20°C to 75°C
    Accuracy, Repeatability 3%, 1%
    Standard ASTM C518

     

    Thermtest Transient Line Source

    The portable TLS is simple to use and convenient for testing of soft or drillable materials.

    Materials Soil and Soft Materials
    Thermal Conductivity Range 0.1 to 5 W/m•K
    Directional Measurement Bulk
    Temperature Range -50°C to 100°C
    Accuracy, Repeatability 5%, 2%
    Standard ASTM D5334

     

    Thermtest Transient Hot Wire Solids

    The Transient Hot Wire for solids is especially designed for testing very small insulative samples. The wire can also be integrated into cast-able materials like aerogel for intimate contact.

    Materials Solids
    Thermal Conductivity Range 0.01 to 0.2 W/m•K
    Directional Measurement Bulk
    Temperature Range Room temperature
    Accuracy, Repeatability 5%, 2%
    Standard NA

     

    Laser Flash Apparatus

    The laser flash method is a popular testing method for a board range of materials. Thermal Diffusivity is the output, with known specific heat, thermal conductivity can be calculated. The LFA performs best on materials with a thermal conductivity over ~ 0.2 W/m•K and offers an excellent temperature range.

    Materials Solids
    Thermal Conductivity Range 0.1 to 2000 W/m•K
    Directional Measurement Through-thickness
    Temperature Range -160°C to 1600°C
    Accuracy, Repeatability 5%, 2%
    Standard ASTM E1461

     

    Guarded Hot Plate

    The measuring tools allow the determination of the thermal conductivity and the thermal resistance of homogenous plates and inhomogeneous test specimens, if the samples are plane and plate-shaped.

    Materials Solids
    Thermal Conductivity Range 0.005 to 2 W/m•K
    Directional Measurement Through-thickness
    Temperature Range -160°C to 100°C
    Accuracy, Repeatability 2%, 0.5%
    Standard ASTM C177

     

    Guarded Heat Flow Meter

    The guarded heat flow meter is ideally suited for materials from plastics to metals up to 40 W/m•K. The minimum sample size is 2 inch diameter.

    Materials Solids & Pastes
    Thermal Conductivity Range 0.1 to 40 W/m•K
    Directional Measurement Through-thickness
    Temperature Range -20°C to 300°C
    Accuracy, Repeatability 5%, 2%
    Standard ASTM E1530

     

    Guarded Heat Flow Meter – Gasket Materials

    This is the only standard method specifically designed for testing thermal conductivity of gasket materials.

    Materials Solids
    Thermal Conductivity Range 0.1 to 1 W/m•K
    Directional Measurement Through-thickness
    Temperature Range -10°C to 80°C
    Accuracy, Repeatability 3%, 1%
    Standard ASTM F433

     

    Guarded Comparative Longitudinal Heat Flow Meter

    Has wide temperature range for testing metals and ceramics.

    Materials Solids
    Thermal Conductivity Range 0.2 to 200 W/m•K
    Directional Measurement Bulk
    Temperature Range up to 1000°C
    Accuracy, Repeatability 5%, 2%
    Standard ASTM E1225-13

     

    Physical Properties Measurement System

    Specially designed for testing to -270°C.

    Materials Solids
    Thermal Conductivity Range 0.1 to 20 W/m•K
    Directional Measurement Through-thickness and In-plane
    Temperature Range -270°C to 100°C
    Accuracy, Repeatability 5%, 2%
    Standard NA

     

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