Measurement of Thermal Paste

How to correctly measure the thickness of thermal paste

Put the Wet Film Thickness Gauge vertically on the surface of the thermal paste without
moving it horizontally. Press slightly and remove.

Visually inspect the marks on the thickness gauge. The thickness of the thermal paste is between the value at the highest visible mark and the next higher value on the gauge (where no mark is present).

In the left orange circle, there is a slight mark on the thickness gauge left by the thermal paste. In the right circle, there is no mark. Therefore, the measurement result is in between 0,050 – 0,075mm.

For Power Electronic Devices, the thickness layer usually lies between 0,05 – 0,2mm. Please consult the data sheets of your manufacturer for the exact measures.