Summary and conclusion
We see in the test that even the old paste performs exactly as advertised at the time, with a real 4.7 W/m-K. But what is wrong: with 92% diamond dust, the paste would not be usable at all, but you could have worked that out for yourself back then. There is the usual 25% silicone content, because despite everything it is still a paste and not a rock-hard pad. The particle size ranges from around 2 to around 10 µm, so the 5 µm specified should probably be understood as an average value. This also results in the fact that the viscous paste can only be compressed to a layer thickness of around 24 µm even at 60 or 70 °C. And the 7 carats in the small tube is a little joke in the form of a stick that we all probably enjoyed jumping over. The marketing really didn’t think it through.
Despite everything, this paste still has a right to exist today, although it has unfortunately disappeared from the market. The almost 5 W/m-K are not bad and the paste makes a very durable impression. Other pastes have already dissolved in the tube after 2 to 3 years and are therefore a case for hazardous waste. But not the Diamond 24, which even after more than 13 years still performed perfectly and showed no signs of dissolving. Compared to a sloppily mixed Thermal Hero Quantum, the Diamond 24 would even be a real bargain.
For those who haven’t read it yet: Here are the links to the test setup again, which I will no longer include as text and pictures in the articles in future, but for which I have written extra basic articles including a presentation of the equipment and the measurement methods in order to save me and you a little redundancy. If you would like to read up or refresh your knowledge, please use the following links to the two measurement setups for ASTM D5470-17 with the TIMA5 nanotest and LIBS including microscopy with the Keyence VX-7100 and EA-300:
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