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Heat Flow Meter (HFM)
Materials Solids and Loose Materials
Thermal Resistance Range 0.001 to 0.5 m2K/W
Directional Measurement Bulk
Temperature Range -20°C to 75 °C
Accuracy, Repeatability 3%, 1%
Standard ASTM C518

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Guarded Heat Flow Meter (GHFM)
Materials Solids & Pastes
Thermal Resistance Range 0.1 to 40 m2K/W
Directional Measurement Through-thickness
Temperature Range -20°C to 300 °C
Accuracy, Repeatability 5%, 2%
Standard ASTM E1530

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Guarded Heat Flow Meter - Gasket Material (GHFM)
Materials Solids
Thermal Resistance Range 0.1 to 1 m2K/W
Directional Measurement Through-thickness
Temperature Range -10°C to 80 °C
Accuracy, Repeatability 3%, 1%
Standard ASTM F433

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Guarded Comparative Longitudinal Heat Flow (GCLHF)
Materials Solids
Thermal Resistance Range 0.2 to 200 m2K/W
Directional Measurement Bulk
Temperature Range up to 1000°C
Accuracy, Repeatability 5%, 2%
Standard ASTM E1225-13

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Frequently Asked Questions

What is thermal resistance?
Thermal resistance hinders heat flow and measures a material or system’s ability to resist heat transfer. It’s expressed in °C/W and depends on factors like composition and thickness. Knowing thermal resistance helps optimize temperature control in thermal management systems.
What is Thermal Resistance testing?
Thermal resistance testing involves measuring the temperature difference through which an object or material hinders the flow of heat. It serves as the reciprocal of thermal conductance, with SI units expressed in kelvins per watt or degrees Celsius per watt.
How to test for thermal resistance?
Thermtest provides a range of thermal resistance testing services. Our methods cover various temperature ranges and sample types. If you have any inquiries about testing, feel free to contact us, and we will promptly provide the information you need.
How much does thermal resistance testing cost?

The cost of resistance testing is dependent on the number of samples and the method of testing. Request a quote today or reach out to us with any questions you may have. Our state-of-the-art thermal testing laboratory is fully equipped to accommodate your thermal resistance testing needs, utilizing the most effective methods available.

What is the significance of thermal resistance testing in material analysis?

The significance of thermal resistance testing in material analysis lies in its ability to assess a material’s resistance to heat transfer. By measuring thermal resistivity, engineers and researchers can determine if a material is suitable for specific applications, optimize energy efficiency, and make informed decisions when selecting materials.

What’s the difference between Thermal resistance and thermal conductivity?
Thermal resistance is a measure of how much a material resists the flow of heat, taking into account the material’s thickness and surface area. On the other hand, thermal conductivity is a property of the material itself that quantifies its ability to conduct heat. A material with high thermal conductivity will have low thermal resistance, and vice versa, assuming the material’s thickness and surface area are constant.
What parameters are measured in thermal resistance testing?

In thermal resistance testing, the main parameters measured are:

  • Temperature Difference: The temperature difference across the material.
  • Heat Flow Rate: The amount of heat passing through the material over time.
  • Material Thickness: The thickness of the material being tested.
  • Surface Area: The area through which heat is flowing.

These measurements help calculate the thermal resistance, which indicates a material’s ability to resist heat flow.

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