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Frequently Asked Questions
What is apparent (effective) thermal conductivity?
Apparent thermal conductivity is a calculated value that uses the thermal impedance (resistance) measured from ASTM D5470 and the sample thickness to calculate a thermal conductivity value. This value is influenced by how effectively the sample contacts (or “wets out”, if a dispensable) the calorimeter surfaces. The thermal resistance at the interface between the sample and the probes is called contact resistance. Contact resistance adds to the overall thermal impedance (resistance) and may produce a lower measurement than bulk thermal conductivity.
What is bulk thermal conductivity and how is it determined?
Bulk thermal conductivity is an intrinsic property of any homogenous material. To measure bulk thermal conductivity, we must subtract the contact resistance from the individual ASTM D5470 thermal resistance measurements. This is achieved by measuring thermal impedance (resistance) of the material at multiple thicknesses (at least three) and generating a straight-line plot. The y-intercept of that plot is the total contact resistance and the slope can be converted to bulk thermal conductivity.
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