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Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Just a warning for others not to make the same mistake I just did.
I bought a couple of tubes of 2-part epoxy resin glue cheaply (Poundland in UK) and used it to pot two MMC banks. The epoxy is pale straw color when mixed and smells a bit like ammonia.
I don't know what's in the epoxy resin - but it conducts electricity at only a few hundred volts per mm
Saved a little on the potting - lost two MMC banks
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Yep, air definitely rules as insulator and you don't really need much better than that. And I say it looks even better than epoxy 'pro-like caps' when caps are arranged nicely.
Maybe four your resin, if resistance of epoxy is high enough you have just a bit lower bleeder resistance. (tried powering the cap?)
* I was obivously too tired or something, started writing nonsense again.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
'normal' (Araldite) epoxy resin glue is excellent for eht potting it's just the cheap c?@p that I bought that's no good.
Usually I coat hv stuff in polyurethane varnish because it keeps out dust and grime and looks good. (hv resistor chains etc.), (not too good with eht @ hf) OR rely on air and long tracking distances which leaves stuff easy to modify/repair/recycle
Registered Member #193
Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
Thanks for the warning; Any thoughhts on washing the stuff off? Normally that's near impossible with epoxy but if it's a bad resin there might be a chance.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Tried soaking in 'White Sipit' (petrochemical alchohol substitute) for days - no better I couldn't be bothered to buy/test other solvents / I got angry with it & dumped the lot
Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
Sulaiman and BC, acetone will eat the epoxy (makes it tacky and/or crumbly depending on type) in a few days... just make sure the container is well sealed.
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Beware of cheap epoxy resin glue
