this post was submitted on 14 Jul 2026
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Optimal thermal paste thickness (bond-line thickness) is critical for heat dissipation. The layer should be thin, ideally between 25 µm and 50 µm, which is roughly the thickness of two sheets of standard paper. The paste's sole purpose is to fill microscopic air pockets between the metal surfaces for better thermal conduction. Source, I spent 6 months in a laboratory experimenting with and producing thermal pastes and insulators. I spent days cutting and cleaning copper squares, applying the experimental pastes, and testing thermal conductivity via the application of Fourier's Law of heat conduction.
Q = kA(Δ T/Δ X)
Where Q is heat flow, A is the cross-sectional area, and Δ x is the paste's thickness.
Another source.
That's way more paste than you need for 50 µm application.
Drops Mic
Back in the Athlon days before heat spreaders everyone wrote about lapping the heatsink on glass so less thermal paste could be used.
Did you say 50mm of thermal paste?
Microns, not milimeters. One micron in 1/1000 of a milimeter.
Ah, my bad. 1000. So 50km of thermal paste?
No! There's no way to measure 50km accurately in your house. He obviously meant 50kg.
You sure its not megameters?
You heard it from the expert, folks, 50magnets
I think he said 50m..
50 miles is too far for paste
To add to this to much is also a problem because it can trap air itself and create air pockets that way