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4hv.org :: Forums :: High Voltage
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Chinese caps for marx generator ??

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Proud Mary
Sun Feb 24 2008, 12:04AM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
These HV capacitors with small lead spacing are intended to be potted in a dielectric medium such as oil, epoxy etc.
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Hazmatt_(The Underdog)
Sun Feb 24 2008, 01:41AM
Hazmatt_(The Underdog) Registered Member #135 Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
I would get Silicone HV putty so you can reuse the caps later. GC chemicals sells a wad of it in their product line. I'd have a picture for you but its all packed up in storage right now.

If you don't want to buy the putty you could always melt some wax on the terminal too, which is pretty good for a temporary potting.
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CompWiz
Sun Feb 24 2008, 02:52PM
CompWiz Registered Member #1038 Joined: Mon Oct 01 2007, 08:02PM
Location:
Posts: 96
What about just plain silicone? (like aquarium sealant)
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Conundrum
Mon Feb 25 2008, 02:53PM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
eeek.. thats not a good idea. IIRC silicone emits acetic acid which would probably muck things up. However the aquarium sealant is IIRC acetone cure (acetone rapidly evaporates so is not an issue)

I did find something interesting called "Moon Sand" which I am going to test as a removeable replacement for wax, it seems to be good so far. It is about £3.75 for 100 grams which is enough for a small multiplier.

If anyone would like some (as my HV lab is in the process of being reconstructed) I can send a few tubs.

Regards, -A
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CompWiz
Mon Feb 25 2008, 05:55PM
CompWiz Registered Member #1038 Joined: Mon Oct 01 2007, 08:02PM
Location:
Posts: 96
My aquarium sealant must use acetic acid because it smells like super concentrated vinegar.

but the smell goes away after about 24 hours.(You cant have any chemical residue in an aquarium unless you like dead fish!)
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