Thermophysical Properties Research Laboratory, Inc.
Phone : 765-463-1581
Thermal Diffusivity

Thermal diffusivity measures the change of temperature which would be produced in unit volume of the substance by quantity of heat which flows in unit time through unit area of a layer of the substance of unit thickness with unit difference of temperature between it's faces.

TPRL provides three methods to measure diffusivity.

The most common is the laser flash (ASTM E 1461-07) which can be run over a temperature range of liquid nitrogen to 2225°C.

The step heat apparatus is used to measure insulating solids over a temperature range of -90°C to 1000°C.

The last method, the multi-property apparatus can measure the thermal diffusivity of good conductors over a temperature range of room temperature to 800°C. However, the laser flash (ASTM E 1461-07) is generally the preferred method for these materials.

Still not sure what is the best testing method for your material? Use our Testing Method Selector Tool to help you decide.

Thermophysical Properties Measured

Thermal Conductivity

Thermal Diffusivity

Specific Heat

Thermal Expansion

Electrical Resistivity


Thermal Gravimetric Analysis & Simultaneous Thermal Analysis


ASTM Methods

Sample Sizes & Definitions

Test Selector Tool

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3080 Kent Avenue
West Lafayette, IN 47906
Last updated 12/22/2017