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Old 12th February 2007, 06:55 AM   #1
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Default Heat Sink Glue-Which?

I need to reduce the tempaerature of a digital LSI chip which runs at 65 C.

Which kind of glue is suitable for gluing a heat sink on. Adhesive pads seem to loose adhesion at 60C or so.

Will cyanoacrylic glue do? The thing needs to be fail-safe.
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Old 12th February 2007, 08:52 AM   #2
AuroraB is offline AuroraB  Norway
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You need a thermally conductive glue......

Look or search for Loctite "Output 384" ( that's the one I use, and the only one I know of right away.....)
It's a 2 part epoxy like glue, the glue in a large tube and a liquid accelerator... just follow the instructions carefully!
looks like the old white Araldite Rapide
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Old 12th February 2007, 10:06 AM   #3
AndrewT is offline AndrewT  Scotland
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Hi,
adhesive pad is far too thick for good thermal transfer.
even the glue on Sellotape is a bit on the thick side.

Cyanoacrylate (instant glue) is very thin when the too surfaces are genuinely flat. The thermal resistance of a very thin glued joint should be acceptable. If the joint faces are not quite flat then sufficient glue to exclude the air will perform adequately well.
But, squeeze the glue out with good finger pressure (watch static).
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Old 12th February 2007, 10:15 AM   #4
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I successfully added some heatsinking to logic chips in a cheapo DVD player that were overheating using cyanoacrylate. I'm not sure I would trust it though for anything that was dumping a lot of power like CPUs or output devices.
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Old 12th February 2007, 02:17 PM   #5
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Arctic Silver Ceramique (adhesive)
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Old 12th February 2007, 04:05 PM   #6
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3M™ Scotch-Weld™ Epoxy Adhesive DP190
Attached Files
File Type: pdf epoxy.pdf (28.9 KB, 15 views)
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Old 12th February 2007, 08:50 PM   #7
radtech is offline radtech  United States
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I wouldn't use cyanoacrylic on anything that gets very hot, that stuff gives off some nasty fumes... a little bit of smoke from it will feel like someone stuck a hot needle in your eye, and if it gets hot enough it can give off cyanide gas
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Old 12th February 2007, 08:58 PM   #8
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Tracon Bipax
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Old 13th February 2007, 02:52 AM   #9
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Arctic Silver Thermal Adhesive. It has excellent thermal properties, its also like epoxy. This stuff is the best.
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Old 13th February 2007, 04:18 PM   #10
EdT is offline EdT  Canada
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Make your own.

I use 5 minute epoxy mixed with 70% epoxy 30% zinc oxide or silver oxide CPU heatsink compound for faster cure times and a 60% epoxy 40% for better heat transfer, but slower cure time.
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