Thermal Conductivity
The time rate of heat flow through a unit area producing a unit temperature difference across a unit thickness.

Thermal conductivity is an inherent or absolute property of the material.

Thermal Resistance

The opposition to the flow of heat through a unit area of material across an undefined thickness.

Thermal resistance varies with thickness.

Thermal Impedance
A property of a particular assembly measured by the ratio of the temperature difference between two surfaces to the steady state heat flow through them.

Factors affecting thermal impedance include:

Area: Increasing the area of thermal contact decreases thermal impedance.
Thickness: Increasing the insulator thickness increases thermal impedance.
Pressure: Increasing mounting pressure under ideal conditions decreases thermal impedance.

Product specific (° C/W)

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