Testing the Thermal Conductivity of Silicone

On a recent visit to China we were asked to test the thermal conductivity of a silicone sample that was tested by an older modified hot wire technique.  The silicone sample had a thermal conductivity value stamped on it of 0.192 W/mK.   The sample was characterized with the TCi Thermal Conductivity Analyzer as pictured below.

Testing results are summarized as follows:

Testing results agreed within 5% of the stated reference value for the standard in agreeing with the general accuracy specification for the device of <5%.  Similarly, multiple measurements taken fell within the TCi's stated precision for the device of <1%.  As the sample was over 15 years old some of the difference may be accounted for by ageing of the material.