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RTV copper silicone as thermal compound?

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TimNJ:
I would think a thermal pad would generally be higher performing, but if for some reason, you need some sort of flexible liquid filling instead, something like this might be reasonable. Don't mind the bastard thermal conductivity unit - It equates to ~1W/m-k.

https://www.cotronics.com/catalog/09%20%204538.pdf

The viscosity is probably in the honey/molasses range which means it will still want to flow, and not stay in place like an RTV silicone might.

thm_w:

--- Quote from: smile on October 30, 2023, 05:54:04 pm ---
--- Quote from: BrokenYugo on October 30, 2023, 11:50:40 am ---One of the flavors of that Chinese electronics silicone you can get in small tubes from the usual places is supposed to be thermally conductive, "silicone thermal conductive adhesive" I'd bet on that sooner than "copper" RTV. AFAIK the "copper" in something like Permatex ultra copper or whatever they're calling it now is more a marketing thing to make you think of copper gaskets in an automotive context, heavy duty/high temp.

--- End quote ---

I tested this myself, the chinese silicone vs. viktor reinz REINZOSIL. There is no difference. Seems like from china they sell you simple silicone.

--- End quote ---

Have you compared to a real thermally conductive RTV though? What was the layer thickness?
Its not the same as regular white silicone as you can see the white powder/material in it. The two materials will separate given time. Not saying its actually any good though.

Found a few from 0.6 up to a max of 2.5W/mk:
0.6W/mK: https://www.aerospace-sealants.com/products/as-rtv-tc?variant=1260232528
1.8 W/mK: https://docs.rs-online.com/d8cf/0900766b80f8df6e.pdf
Normal RTV is 0.3 as noted above: https://www.sciencedirect.com/science/article/abs/pii/S001122759700146X

Kafuter K-5203k claims to be 1.6W/mK

smile:
This is result of testing DIY thermal glue. I think it works good enough if it matches thermal pad from memory of GPU.
So no need need to go crazy buying expensive stuff. This is about 1mm thick

smile:
NO replies wow.

thm_w:

--- Quote from: smile on January 09, 2024, 05:14:11 pm ---NO replies wow.

--- End quote ---

Your test is interesting but not conclusive at all.
You haven't even listed the temperature numbers, and you haven't compared two products at the same thickness in a typical use case (eg heat source -> TIM -> heat sink).

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