Adhesive for Large Electrolytics to PCB - diyAudio
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Old 14th March 2007, 10:11 PM   #1
TerryC is offline TerryC  United States
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Default Adhesive for Large Electrolytics to PCB

What's a good adhesive type/brand for securing large electrolytic capacitors to a printed circuit board.
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Old 14th March 2007, 10:34 PM   #2
dangus is offline dangus  Canada
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RTV silicone or hot glue can work, and can be removed without extraordinary effort.
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Old 14th March 2007, 10:39 PM   #3
AndrewT is offline AndrewT  Scotland
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Hi,
RTV silicone makes an excellent adhesive.
I use the clear window sealer. It seems to withstand heat, oil and fuel better than the real engine types.
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Old 14th March 2007, 10:47 PM   #4
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I have always used contact cement, but make sure you are gluing driectly to the aluminum can and not a plastic piece held in place by the shrink-tubing that covers the rest of the cap. If that stuff cracks, your cap may fall and cause a big problem.

Adhesive isn't very good for things that get shaken or jarred a lot. It is best to bolt caps in place in that sort of app. I also bolt down HV caps because I just don't trust adhesives to do their job for 20 years.

You can put one long bolt through the PCB and then use a couple tie-wraps to hold the cap to the bolt. Use at least 2 tie-wraps in case one breaks.

I_F
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Old 15th March 2007, 08:34 AM   #5
Elvee is offline Elvee  Belgium
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Hi,

Silicone (the neutral, non-acetic variety) is excellent: it is compliant, durable, has good adhesion and can be removed if needed. Hot glue is less reliable regarding the long term adhesion; contact glues based on neoprene tend to degrade with time, hardening and releasing corrosive sulfur compounds.
LV
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Old 17th March 2007, 08:28 PM   #6
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One thing I've found with RTV (may only apply to certain types, may apply to all, I don't know) is that it seems to release a corrosive vapor as it cures. Make sure you don't apply it to a cap and then seal up your chassis. Let it cure on the bench, and when it is fully hardened, put it in the chassis.

Maybe someone knows exactly what causes this and can explain. I only know about it because I've seen it happen.
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Old 17th March 2007, 08:43 PM   #7
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acetic acid...vinegar.

Apparently as it cures it releases acetic acid..or maybe that's the chemical that makes it cure,I'm not too sure on the exact chemistry of it...But yea,it's stinky,and can cause corrosion issues from the acid.
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Old 17th March 2007, 09:31 PM   #8
AndrewT is offline AndrewT  Scotland
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Hi,
these silicones are two part adhesives.
The second part is the water in the atmosphere.
The by-product of the reaction is the acetic acid, given off as a vapour.
Yes, let it evaporate before sealing it up in an enclosure.
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Old 17th March 2007, 09:35 PM   #9
TerryC is offline TerryC  United States
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I Googled +RTV +Silicone +adhesive +"electronics grade" and found this from Allied Electronics which should do the job.

http://www.alliedelec.com/Search/Pro...E17F&tab=specs
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Old 17th March 2007, 10:17 PM   #10
SY is offline SY  United States
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So-called construction adhesive works well and I haven't had any corrosion problems. If you get some on your hands, it will be there for a while...
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