I finished PGS-ing the hell outta this thing. It was more arts and craft than anything else. You can probably tell what was the first patchwork I did
PGS A-M adhesive is insulating but it's so easy to break in sharp corner that I ended up with some nice fireworks on the bench. Fortunately, and surprisingly, the goggles held on and everything is working fine. So I replaced the 40 and 70 with some of that thick SSM and removed PGS when functions were lost. One display, 70C, 3A draw no DVR were a telltale sign.
SSM is heavy so I tried limit its use.
Overall it's balancing the heat of most of the internal organs quite well but now it's time to dissipate all this heat with heatsinks. Or maybe abandon this idea and dremeling in a 20x20 silent fan (cannot find 20x20 blowers!)
Never seen someone make a heatsink from PGS. You could experiment, a long curled up ribbon of PGS almost certainly wouldn't work ... but maybe a flat backbone sheet with a curled ribbon on top glued to the backbone at the valleys might. Even if it works, it's fragile, so it would need a plastic cage around it.
Thermal resistances add up fast with only 70 um thickness, even at 1000 W/mK. I'd double up on PGS and make two connections from heat source to heat sink.
PGS70 is quite sturdy, the guys at Panasonic told me that best way to bridge two PGS is pressure. I'd have to make or find a clip
You're saying that thermal resistance goes up the thinner the PGS is?
Why is the thermal conductivity higher on 40 than on 70?
How does thermal resistance work?
What do you mean by double up?
You will find that such heat sinks are available, but require a pretty large fin surface area. My gut feeling is that you don't want to accommodate that large area on your device, and need to stick with fan-supported cooling.
I wonder if there is a way to turn the plastic case into a heatsink by covering it with a material that's not too heavy
PGS is sensitive to scratching otherwise I'd use it.