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From: Hammy on 9 Apr 2010 09:24
On Fri, 9 Apr 2010 08:02:16 -0500, "Tim Williams"
<tmoranwms(a)charter.net> wrote:


>
>Neat how the emitter bondwire seems to have turn into a fulgerite.
>
>Tim
Glue them back together and sell them on E-BAY for half price. Under
not tested and as is.;-)
From: Ecnerwal on 9 Apr 2010 13:39

You might try carburetor cleaner? In which case you could get a
wide-mouth can with a basket to dunk parts that you can reseal for less
fumes (with the parts dunked in it) at an auto parts store. California
version is different than elsewhere, per one set of MSDS I looked at,
but either seems worth a try.

I recalled it having the aforementioned methylene chloride, but that was
missing from the MSDS's I happened to find for the current stuff -
perhaps some brands still use it, but if something else will work, might
be just as well. When I had all 4 carbs form a 140 corvair soaking, I
had tinfoil over them and used a fume hood and still was not overly
happy about it - nasty stuff.

One brand of commercial epoxy solvent ("Attack") seems to be mostly
methylene chloride (based on some mentions, have not found an MSDS for
it), so there's an indicator that that may be the stuff you want. In
which case, all due caution, it is unpleasant stuff.

--
Cats, coffee, chocolate...vices to live by
From: whit3rd on 9 Apr 2010 16:49
On Apr 9, 10:10 am, dagmargoodb...(a)yahoo.com wrote:
> On Apr 9, 10:54 am, John Larkin

> >...yesterday I blew up a Murata sip dc/dc converter,
> > and hacked it open to see what's inside.... Anybody know of
> > a way to dissolve epoxy? The substrate is ceramic, so it will survive.

> Warm it to ~200ºF, and it gets soft.  You can pick it away with a
> needle, heating as needed to keep it soft.

That's the hard way. Hot sulfuric acid is easier.
Or, bake in a kiln and dust after cooling with a camel hair
brush...
From: RST Engineering on 10 Apr 2010 12:50

>I'd destroyed enough stuff to make analysis difficult. Anybody know of
>a way to dissolve epoxy? The substrate is ceramic, so it will survive.

I've used lacquer thinner to dissolve epoxy, but it works rather
slowly, and I'm not sure about different formulas of epoxy. It does
work slowly on the stuff from the handyman store.

Jim

From: dagmargoodboat on 10 Apr 2010 19:06
On Apr 9, 3:49 pm, whit3rd <whit...(a)gmail.com> wrote:
> On Apr 9, 10:10 am, dagmargoodb...(a)yahoo.com wrote:
>
> > On Apr 9, 10:54 am, John Larkin
> > >...yesterday I blew up a Murata sip dc/dc converter,
> > > and hacked it open to see what's inside.... Anybody know of
> > > a way to dissolve epoxy? The substrate is ceramic, so it will survive..
> > Warm it to ~200ºF, and it gets soft.  You can pick it away with a
> > needle, heating as needed to keep it soft.
>
> That's the hard way.  Hot sulfuric acid is easier.
> Or, bake in a kiln and dust after cooling with a camel hair
> brush...

Depends on your definition of hard, doesn't it? :-) Hot acid scares
me.

OTOH, dipping a part in boiling water is pretty benign.

Epoxy gets crumbly (like a gum eraser) when so warmed. That, then
picking away the crumbs with a dental pick had it clean in no time.

(This was for epoxy used to encapsulate / pot. Dunno if, fer
instance, IC packages would respond as well.)

--
Cheers,
James Arthur
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