The topic of the ageing of thermal conductive pastes is more topical than ever and before we get to the showdown of some phase change pads and pastes in the near future, I’m going to interpose a graphene pad by popular demand, which is not only made of carbon but also costs a lot of it. I was a little skeptical at first, but in the end (almost) everything worked as advertised. But I’ll come to that in a moment. If you’re looking for an endurance runner for your graphics card that won’t degrade within a few months, you’ll find it here. But more on that in the test.
The KryoSheet is actually a FrostSheet from SHT (Sonder High-Tech) in Sweden. This is a company that specializes in the development and production of high-tech thermal management solutions and supplies Thermal Grizzly almost exclusively. With years of experience in the industry, SHT has developed innovative products such as the FrostSheet to meet the increasing demands for cooling in the electronics industry.
Important foreword
What I intend to do today consists of two, actually three, separate sections. This time, I will start with microscopy and the material test, as this is extremely important for a general understanding of the topic of cryosheets. Only then will I test the cryosheet in TIMA5 like a normal paste and, on the other hand, I will equip the Manli GeForce RTX 4080 Gallardo, which has already been tortured several times, with this sheet and a CPU for comparison.
I am now deliberately adding a quote from Thermal Grizzly, which not only comes from my soul, but also confirms my laboratory measurements. You can’t bend physics. Not even with the sheet, because the well over 90 W/(m-K) that SHT promises for the original FrostSheet will not even come close to being achieved in reality. For those who wonder how it is possible to arrive at figures above this limit, it should be noted that test conditions can certainly be adapted to achieve astronomically high figures. Without knowing the exact circumstances, such values are completely misleading and meaningless, even with exotic sheets. And that’s exactly why I have to insert a page with a more detailed explanation.
The mostly theoretically determined thermal conductivity values differ greatly depending on the application, as important factors such as contact pressure, temperature or surface cannot be taken into account uniformly. Since the 4th quarter of 2020, all our cooling products have therefore no longer given specific values for thermal conductivity.We continue to rely on the test results of independent tests and reviews so that our customers can get a more realistic impression of the performance of our products in practice under comparable circumstances.
Real long-term simulations (3000 hours in 1000 cycles up to 90°C) are not feasible in terms of the effort involved. Therefore, I can only make predictions, but I want them to be understood as such. It is virtually impossible to make scientifically sound statements in just a few days. Yes, you can identify a trend and scale it as a forecast based on existing data, but this is not something that allows you to make really reliable statements. Therefore, I am sorry to say that I have to leave out this important point. However, as far as time permits, I will take community feedback into account and add the comments and long-term experience of third parties to the database as a note in due course, if it seems necessary. In both a positive and negative sense. However, this is a subjective value that has no place in a comparative database.
Unboxing
The sheet is 38 x 38 mm wide and approx. 0.2 mm thick. We will see that the specified tolerance limit of 10% is adhered to, but the pad first needs some pressure to work properly. In my case, it was 175 µm, but I’ll have the relevant measurements for you in a moment. The sensitive sheet is packed in a very sturdy little box padded with foam, and not without reason.
The problem with these pads is the non-destructive assembly, placing them on the test body and optically attaching them. I will have a little tutorial on this later.
Further links and basics
Thermal Grizzly KryoSheet, Wärmeleitpad, 38x38x0.2mm (TG-KS-38-38)
 | lagernd: 50+ | 21,52 €*Stand: 28.04.25 01:23 |
 | Lagernd im Außenlager, Lieferung 2-3 WerktageStand: 28.04.25 01:20 | 21,77 €*Stand: 28.04.25 01:22 |
 | Auf Lager, Lieferzeit 1-2 Werktage | 21,82 €*Stand: 28.04.25 00:52 |
- 1 - Introduction and background information
- 2 - Test methods and equipment
- 3 - The "secrets" of the KryoSheet and material analysis
- 4 - Thermal resistance in theory and practice
- 5 - Thermal condiuctivity in theory and practice
- 6 - Tests with a GeForce RTX 4080 and Core i9-13900K
- 7 - Summary and conclusion
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