Page 130 - GETELEC catalogue US 2020

Introduction

DESCRIPTION
The GTG range includes highly conductive thermal pad ideal for applications requiring high thermal conductivity. Its
specific formulations developed by our laboratory, as well as its loads, give these silicone elastomers and exceptional
thermal conductivity.

Thanks to their great flexibility and ease of installation, they follow the surface ireegularities between the power
component and the cooler as soon as they are assembled which helps to dissipate heat and protect your equipment.

TESTS : DETERMINATION OF THERMAL CONDUCTIVITY

The thermal conduction power of our GTG range has been measured using the «Modified Transcient Plane Source»
(MTPS) technique used to characterize the thermal conductivity and effusivity of materials according to ASTM D
7984. This technique consists in using a unilateral interfacial thermal reflectance sensor that applies a constant heat
source to the sample. The instantaneous measurement of thermal conduction ensures a detailed overview of the
heat transfer properties of our samples.

Where effusivity = √(KPC p )

Where :
• K = Thermal conductivity (W/m.K)
3
• P = Density (Kg/m )
• C = Heat capacity (J/kg.K)
p

OPERATING PRINCIPLE

Sample

[2] A guard ring surrounds the primary sensor coil to
support one-dimensional heat transfer in the sample.

The current applied results in an increase in the
temperature at the interface between the sensor and the
sample, which induces a variation in the voltage drop of
the sensor element.

[1] A given electric current is diffused to the heating element

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