Join us at the International Thermal Conductivity Conference (ITCC) and the International Thermal Expansion Symposium (ITES).

Transient Hot Wire Liquids (THW)
Materials Liquids and Pastes
Thermal Conductivity Range 0.01 to 2 W/mK
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/mK
Directional Measurement Bulk
Temperature Range -50°C to 100°C
Accuracy, Repeatability 5%, 2%
Standard ASTM D5334

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Transient Plane Source (TPS)
Materials Solids, Liquids, Paste, and Powder
Thermal Conductivity Range 0.005 to 1800 W/mK
Directional Measurement Bulk, Through-thickness, and In-plane
Temperature Range -160°C to 1000°C
Accuracy, Repeatability 5%, 2%
Standard ISO 22007-2.2

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Frequently Asked Questions

What is thermal resistivity?
Thermal resistivity refers to the inherent property of a material that quantifies its resistance to heat flow. It is a measure of how effectively a material can conduct heat, indicating its ability to transfer thermal energy. Thermal resistivity is typically represented by the symbol “ρ” and is expressed in units of Kelvin meter per watt (K·m/W).

Higher thermal resistivity values indicate poorer heat conduction characteristics, while lower values signify better thermal conductivity. Understanding the thermal resistivity of materials is crucial in various fields, including thermal engineering, insulation design, and heat transfer analysis, as it helps determine the efficiency of heat transfer and aids in selecting appropriate materials for specific applications.

What is thermal resistivity testing?
Thermal resistivity is a measure of how well a material resists the flow of heat. It tells us how good a material is at insulating against heat transfer. We express it in units like °C·cm/W or °C·in/W. Thermal resistivity is important because it helps us choose the right materials for things like thermal insulation, which can improve energy efficiency. It’s different from thermal conductivity, which measures how well a material conducts heat. Understanding thermal resistivity helps us compare different materials and decide which ones are best for specific uses.
How is thermal resistivity tested?

When it comes to testing for thermal resistivity, there are multiple options available, each tailored to specific materials and temperature ranges. At Thermtest, we are proud to offer a comprehensive suite of thermal resistivity testing services. Our goal is to provide accurate and reliable measurements that help you understand and evaluate the thermal properties of your materials.

Our testing methods are designed to accommodate various sample types. We understand that different materials require different approaches to accurately assess their thermal resistivity. Our experienced team utilizes state-of-the-art equipment and techniques to ensure precise measurements and meaningful results.

Furthermore, we cover a wide range of temperatures in our thermal resistivity testing services. Whether you need measurements at low temperatures, high temperatures, or anything in between, we have the expertise and capabilities to meet your needs. Our testing procedures are carefully designed to handle the unique challenges posed by different temperature regimes, ensuring reliable and consistent data.

How is thermal resistivity different from thermal conductivity?
Thermal resistivity and thermal conductivity are properties that are inversely related. Thermal resistivity measures a material’s ability to impede the transfer of heat, whereas thermal conductivity quantifies its capacity to conduct heat. In simpler terms, thermal resistivity is a measure of how well a material insulates against heat, while thermal conductivity describes how well it conducts heat.
What parameters are measured in thermal resistivity testing?
The main parameter measured in thermal resistivity testing is the thermal resistivity itself. This value indicates the material’s resistance to heat transfer and is typically expressed in units such as °C·cm/W or °C·in/W.
Can thermal resistivity testing be conducted on liquids and gases?
Thermal resistivity testing is primarily performed on solid materials. Liquids and gases have different characteristics when it comes to heat transfer, and their properties are often described in terms of thermal conductivity rather than resistivity.
Are there any established standards or guidelines for thermal resistivity testing?
Yes, there are recognized standards and guidelines for thermal resistivity testing, such as those provided by ASTM International. These standards outline specific procedures for preparing samples, conducting the tests, and analyzing the resulting data. Their purpose is to ensure consistency and comparability of results across different testing scenarios.


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