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Transient Plane Source (TPS)
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 22007-2

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Heat Flow Meter (HFM)
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

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Transient Hot Wire Liquids (THW)
Materials Liquids and Pastes
Thermal Conductivity Range 0.01 to 2 W/m•K
Directional Measurement Bulk
Temperature Range -50°C to 400°C
Accuracy, Repeatability 5%, 2%
Standard ASTM D7896

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Transient Line Source (TLS)
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

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Laser Flash Apparatus (LFA)
Materials Solids
Thermal Conductivity Range 0.1 to 2000 W/m•K
Directional Measurement Through-thickness
Temperature Range -100°C to 1000°C
Accuracy, Repeatability 5%, 2%
Standard ASTM E1461

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Guarded Heat Flow Meter (GHFM)
Materials Solids and Pastes
Thermal Conductivity Range 0.1 to 100 W/m•K
Directional Measurement Through-thickness
Temperature Range -20°C to 300°C
Accuracy, Repeatability 5%, 2%
Standard ASTM E1530

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Guarded Comparative Longitudinal Heat Flow (GCLHF)
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

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Physical Properties Measurement System (PPMS)
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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Frequently Asked Questions

What is thermal conductivity?
Thermal conductivity is a property that measures a material’s ability to conduct heat. It quantifies how effectively heat is transferred through a material when there is a temperature gradient. Higher thermal conductivity values indicate better heat conduction. It is generally denoted by the symbol ‘k’ but can also be denoted by ‘λ’ and ‘κ’.
What are the units of thermal conductivity?
The units of thermal conductivity depend on the system of units used. In the International System of Units (SI), thermal conductivity is typically expressed in watts per meter per degree Celsius (W/m•°C) or watts per meter per Kelvin (W/m•K). Other common units include calories per second per centimeter per degree Celsius (cal/s•cm•°C) in the CGS system.
What is thermal conductivity testing?
Thermal conductivity testing is measuring the ability of a material to transfer or conduct heat. This can be done using a variety of methods and instruments.
How to test for thermal conductivity and how is thermal conductivity measured?
There are a number of different methods and instruments to measure thermal conductivity, each of them is suitable for a range of materials, depending on the properties of the material and temperature range to be tested.

Thermal conductivity can be measured through a variety of different methods. Common methods include the transient hot wire method, the steady-state method, and the transient plane source method.

Thermtest offers various thermal conductivity testing services. If you have any questions about testing, please contact us for more information.

How much does thermal conductivity testing cost?

The cost of thermal conductivity testing is highly dependent on the number of samples to be tested and method of testing required. Contact us to request a quote. We have a full-service thermal testing laboratory to accommodate your thermal conductivity testing needs using the best thermal conductivity measuring methods available.

Why is thermal conductivity important?
Thermal conductivity is essential in various fields, including engineering, materials science, and thermodynamics. It influences heat transfer, insulation effectiveness, and the performance of thermal management systems. Understanding thermal conductivity helps in selecting appropriate materials, optimizing energy efficiency, and designing effective heat exchange systems.
What is the difference between thermal conductivity and heat conductivity?

Thermal conductivity and heat conductivity are often used interchangeably, but there is a subtle distinction between the two terms. Thermal conductivity refers to a material’s ability to conduct heat, quantifying how efficiently heat is transferred through the material. On the other hand, heat conductivity can be considered as the actual process of heat transfer itself, regardless of the material. It encompasses conduction, convection, and radiation, which collectively contribute to the overall heat transfer.

While thermal conductivity focuses on the material’s specific property, heat conductivity is a broader term encompassing the transfer of heat energy in general. In practice, however, these terms are often used to describe the same property or process.

Can thermal conductivity be affected by temperature?
Yes, thermal conductivity is temperature dependent. The thermal conductivity may increase or decrease with temperature depending on the sample being tested. This behavior is particularly relevant in materials that undergo phase transitions or exhibit changes in molecular structure as temperature varies.
What are the applications of thermal conductivity testing?
Thermal conductivity testing has diverse applications. It is crucial in fields such as construction, aerospace, electronics, and energy systems. It helps in selecting insulation materials, designing heat sinks, optimizing building envelope performance, and evaluating the thermal efficiency of various components and systems.

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