Heat Sink Glue-Which? - Page 2

cpemma · 14th February 2007, 12:43 AM

WE had this discussion in Class D re adding a small sink to the T-amp chips; opinion was Superglue (cyanoacrylates) has too low a temperature limit (though this seems to vary with brand, so YMMV).

I used (on recommendation) JBWeld, a filled epoxy claimed to stand red heat; does the job.

I'd certainly expect the thermal epoxies sold for the purpose to be better, but they're hellish expensive.

Like any other TIM, the thinner the bond, the better the heat transfer.

radtech · 14th February 2007, 04:18 AM

I was looking at the arctic silver site and they warn that once you glue a heat sink on with their stuff, it ain't coming off.
So my question is, what would you use if you wanted a thermal glue that wasn't quite so permanent?

EdT · 14th February 2007, 04:35 AM

All epoxies will gell and pry off at 200Deg C.

Epoxies has structural strength and Superglue does not, they will shear the second there is impact or leverage, also the texture on most chips will leave small gaps which limits proper thermal transfer. The best glue based product is from Loctite, they have a two part activator type glue that is fast and effective.

Another option for low heat (up to 120Deg C) and non-permanent applications is thermal tapes. The best ones are from Chomerics, their silver impregnanted acrylique aluminium meshed double sided tapes are the best and the regular aluminium foil or silicone based transfer tapes found on most PC based application

I stuck a heatsink on the TA2024 with just the regular AL foil transfer tape, it has more than enough holding strength.

AndrewT · 14th February 2007, 09:46 AM

Hi,
what's all this talk of 100+ degC?

If Tc is that hot the chip is beyond starting to struggle.

If I were adding a heatsink to an overheating chip then I would be looking for Tc<70degC and preferably <50degC.
Cyanoacrylate easily survives these temperatures.

And the low viscosity also fills all the crevices and undulations.

AuroraB · 14th February 2007, 10:32 AM

Well... I've used the Loctite "Output 384" for several years now. Made for the purpose of glueing heatsinks and the likes, bonds well if instructions are followed, and prys off *fairly* easy by using a knife edge or something...

Costly - prb'ly is- I use it professionally, so I don't pay from my own smallish heap of doe...

The PC crowd hails the Arctic silver stuff, but I have never used it....

Everyone to his own taste , I guess.......

14th February 2007, 09:46 AM	#14
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, what's all this talk of 100+ degC? If Tc is that hot the chip is beyond starting to struggle. If I were adding a heatsink to an overheating chip then I would be looking for Tc<70degC and preferably <50degC. Cyanoacrylate easily survives these temperatures. And the low viscosity also fills all the crevices and undulations. __________________ regards Andrew T.

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14th February 2007, 12:43 AM	#11
cpemma diyAudio Member Join Date: Jul 2003 Location: S Yorkshire OK	WE had this discussion in Class D re adding a small sink to the T-amp chips; opinion was Superglue (cyanoacrylates) has too low a temperature limit (though this seems to vary with brand, so YMMV). I used (on recommendation) JBWeld, a filled epoxy claimed to stand red heat; does the job. I'd certainly expect the thermal epoxies sold for the purpose to be better, but they're hellish expensive. Like any other TIM, the thinner the bond, the better the heat transfer.

14th February 2007, 04:18 AM	#12
radtech diyAudio Member Join Date: Dec 2006	I was looking at the arctic silver site and they warn that once you glue a heat sink on with their stuff, it ain't coming off. So my question is, what would you use if you wanted a thermal glue that wasn't quite so permanent?

14th February 2007, 04:35 AM	#13
EdT diyAudio Member Join Date: Dec 2006	All epoxies will gell and pry off at 200Deg C. Epoxies has structural strength and Superglue does not, they will shear the second there is impact or leverage, also the texture on most chips will leave small gaps which limits proper thermal transfer. The best glue based product is from Loctite, they have a two part activator type glue that is fast and effective. Another option for low heat (up to 120Deg C) and non-permanent applications is thermal tapes. The best ones are from Chomerics, their silver impregnanted acrylique aluminium meshed double sided tapes are the best and the regular aluminium foil or silicone based transfer tapes found on most PC based application I stuck a heatsink on the TA2024 with just the regular AL foil transfer tape, it has more than enough holding strength.

14th February 2007, 10:32 AM	#15
AuroraB diyAudio Member Join Date: May 2001 Location: Norway, -north of the moral circle..	Well... I've used the Loctite "Output 384" for several years now. Made for the purpose of glueing heatsinks and the likes, bonds well if instructions are followed, and prys off fairly easy by using a knife edge or something... Costly - prb'ly is- I use it professionally, so I don't pay from my own smallish heap of doe... The PC crowd hails the Arctic silver stuff, but I have never used it.... Everyone to his own taste , I guess.......

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