Nuomi Chemical SY-166 Thermal Paste Review – Cheap Poser or really cheap Alternative?

1 - Introduction, advertising claims, and technical specifications 2 - Fracture behavior, microscopy, and composition 3 - Performance comparisons and practical measurements 4 - Durability (pump-out), summary, and conclusion

Sometimes you come across products on the open market that seem so ambitious that you almost have to smile in awe. Thermally conductive pastes with utopian performance specifications undoubtedly belong in this category. Suddenly, gray mush becomes the physical reincarnation of the perpetual motion machine, silicone oil and fillers become a miracle of heat transfer. The Nuomi Chemical SY-166 tested today, whose cryptic name already stands for the fabulous 16.6 W/mK, a value that is about as realistic in this price range as a unicorn in the laboratory, also falls into this category. But well, many things seem possible in China anyway, even things that contradict thermodynamics. And since this paste costs less than three euros for four grams, you simply have to test it. Just out of curiosity, to see whether it is at least cheaply good or just cheaply cheap.

However, before I dive into the depths of this silvery gray substance, a small interim remark: This will most likely be one of the last reviews in which I use the well-known swelling test for a rough assessment of durability. Thanks to the cooperation with my industry partner Nanotest, the technical requirements will soon be in place here in the laboratory to be able to carry out real durability tests according to industry standards. How such a TTV works and what new possibilities it opens up will be the subject of a later basic article. We can only say this much in advance: It’s going to be really exciting and the chapter on thermal conductivity testing should finally be raised to a new technical level. There is always room for technology.

If there happens to be a chemist among the readers or someone who has close connections to a suitable laboratory, I would of course be very happy to hear from them.

What you get first: Marketing, but at a very low price

Sometimes the packaging of a thermal compound reveals more about the product than any data sheet. The Nuomi Chemical SYY-166, for example, is something like the “superfood” among pastes: packed with promises, zeros and scientific-sounding buzzwords. The 16.6 W/mK alone screams Chinese engineering in the field of free marketing. You learn that this paste not only offers “Extreme performance”, but is also “Perfect for gaming and overclocking” – as if electrons suddenly behave in a sporty manner when they race through an i7 chip. And of course “Nano technology” is a must, because without nano everything sounds a lot less like space and science.

The manufacturer also promises: “Works stable under high temperature” and “Easy to apply” for anyone who sweats the first time they apply it. So neither sticky nor melting – allegedly. There is also the reassuring note “Non-electrically conductive”, which means you can rest assured, even if the paste accidentally ends up halfway between the die and the base.

The accessories are a small miracle of generosity. Two damp cloths, affectionately called “Wet Wipes Grease Cleanser”, are allowed to do the foreplay before the actual act of application follows with the enclosed spatula. A nice piece of plastic that has probably seen more PCs than many an IT technician. The four grams of paste are contained in a small syringe that looks like a medical device but promises to “Keep Your Life Cool” according to the imprint. How exactly a gray silicone paste is supposed to cool my life remains to be seen, but the slogan has style.

The whole thing is rounded off with a proud “6-year warranty”. Six years’ shelf life for a product that doesn’t survive six hours at 200 degrees in the endurance test anyway. But paper is patient and packaging is even more so. Who wants to be petty? After all, the back of the bag also bears all the seals of approval of the modern age: CE logo, RoHS symbol and a recycling icon, giving the impression that this is a certified product from the league of green laboratory legends. Seen in this light, the SYY-166 is almost poetic: a paste that promises more than can ever fit between two chips, and yet appears with so much conviction that you almost want to believe in it. If the 16.6 W/mK doesn’t work, then perhaps at least the six-year guarantee on good marketing will. But it is cheap: a big plus point up front.

Below is a tabular summary of the advertised and realistic technical data:

This shows that there is a considerable gap between the advertising promises and the physical reality. And that is precisely why we now need to measure the whole thing!

	Material analysis and microscopy	Basic knowledge
Here you can find out why effective thermal conductivity and bulk thermal conductivity can be completely different in practice, what role the contact resistance between the surfaces and the paste plays and how thermal paste can be measured accurately. There is also a detailed description of the equipment, the methodology and the error tolerances.	You will learn how laser-induced plasma spectroscopy works and the advantages and limitations of the measurements. There is also high-resolution digital microscopy and analysis of particle sizes. This information is also used to estimate the long-term stability of a paste.	Anyone who has always wanted to know what is or is not in a paste and how these pastes are produced will find what they are looking for here. The basic article provides a better understanding of what is often sold for far too much money and sometimes with adventurous promises.