Dissolve heat conductive cement

**CapLeaker** · 09-13-2021, 07:24 PM

Well… I am working on a Catapillar ECU (70 pin). I managed to take the main board on the top off after repeated prying, but how in the effin world does the driver board on the bottom come out? There is too much of that heat conductive cement on there. It’s hard almost like a rock. I guess it has a dual function, having thermal conductivity and keeping things planted due to vibration. Thought of putting Acetone in there, but then I don’t know if any of the plastics are going to melt.

So how do I get that board heat conductive cement or whatever it is dissolved? Heat?

**petehall347** · 09-14-2021, 02:38 AM

a long soak in petrol sometimes works . must admit i never tried that with the hard stuff .

**CapLeaker** · 09-14-2021, 04:16 AM

I think I may unsolder more stuff and see what that does.

**stj** · 09-14-2021, 04:18 AM

the hard stuff if it's a blue-gray colour is epoxy resin loaded with zinc oxide.
good luck if it's that!!!

**CapLeaker** · 09-14-2021, 10:18 AM

Quote:

Originally Posted by stj

the hard stuff if it's a blue-gray colour is epoxy resin loaded with zinc oxide.
good luck if it's that!!!

Yeah that stuff you are talking about is epoxy... This stuff here is very light grey and not that epoxy hard, but hard. I've unsoldered more, but still can't get that damn board off or out.

**eccerr0r** · 09-14-2021, 11:06 AM

thermoset plastics need to be banned so that we can repair our electronics...
(then again, IC encapsulation are thermosets...)

**CapLeaker** · 09-14-2021, 03:17 PM

Well… I opened that ECU. See other thread.

09-13-2021, 07:24 PM	#1
CapLeaker Leaking Member Join Date: Dec 2014 City & State: Atlantic Canada My Country: Canada Line Voltage: Ground, 0Hz I'm a: Hobbyist Tech Posts: 4,818	Dissolve heat conductive cement Well… I am working on a Catapillar ECU (70 pin). I managed to take the main board on the top off after repeated prying, but how in the effin world does the driver board on the bottom come out? There is too much of that heat conductive cement on there. It’s hard almost like a rock. I guess it has a dual function, having thermal conductivity and keeping things planted due to vibration. Thought of putting Acetone in there, but then I don’t know if any of the plastics are going to melt. So how do I get that board heat conductive cement or whatever it is dissolved? Heat?

09-14-2021, 02:38 AM	#2
petehall347 Badcaps Veteran Join Date: Jan 2015 City & State: worcester My Country: United Kingdom I'm a: Knowledge Seeker Posts: 2,984	Re: Dissolve heat conductive cement a long soak in petrol sometimes works . must admit i never tried that with the hard stuff .

09-14-2021, 04:16 AM	#3
CapLeaker Leaking Member Join Date: Dec 2014 City & State: Atlantic Canada My Country: Canada Line Voltage: Ground, 0Hz I'm a: Hobbyist Tech Posts: 4,818	Re: Dissolve heat conductive cement I think I may unsolder more stuff and see what that does.

09-14-2021, 04:18 AM	#4
stj Great Sage 齊天大聖 Join Date: Dec 2009 City & State: Europe My Country: some shithole run by Israeli agents I'm a: Professional Tech Posts: 25,369	Re: Dissolve heat conductive cement the hard stuff if it's a blue-gray colour is epoxy resin loaded with zinc oxide. good luck if it's that!!!

09-14-2021, 11:06 AM	#6
eccerr0r Solder Sloth Join Date: Nov 2012 City & State: CO My Country: USA Line Voltage: 120VAC 60Hz I'm a: Hobbyist Tech Posts: 6,368	Re: Dissolve heat conductive cement thermoset plastics need to be banned so that we can repair our electronics... (then again, IC encapsulation are thermosets...)

09-14-2021, 03:17 PM	#7
CapLeaker Leaking Member Join Date: Dec 2014 City & State: Atlantic Canada My Country: Canada Line Voltage: Ground, 0Hz I'm a: Hobbyist Tech Posts: 4,818	Re: Dissolve heat conductive cement Well… I opened that ECU. See other thread.

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