[meteorite-list] Repairing broken meteorites

From: mafer_at_domafer.com <mafer_at_meteoritecentral.com>
Date: Thu Apr 22 10:07:03 2004
Message-ID: <15485.24.69.255.202.1035171224.squirrel_at_140.186.45.27>

Hi Bob and list
My understanding of epoxies is that they aren't hygroscopic as all of the
superglues are (can't for the life of me remember the technical name for
the stuff..something like cyanoacrilic adhesives or some such). I do know
that they will dis-color given a moisture mobile stain such as iron or
nickle. Epoxies come in many flavors and many do dis-color over time, so
we use the two part epoxies that are resistant to uv and thus yellowing
for thin sections, which there are quite a few and the price and shelf
life are fairly good. Some of the uv curable epoxies also are coming into
favor for such things as thin sections and optics, but I think its a very
high cost to get something that in general does no better than a 2 part
does. I also fell that at some point, one has to decide if a repair is
warrented. Would the value decrease below the value of 2 or more smaller
pieces? With all the hub-bub about fake trilobites (some enterprizing
foreign dealers have taken to making casts of rare trilobites and afixing
them to matrix which may or maynot contain others or parts of others of
the same type to fulfill market demands and this has caused a lot of
questioning by collectors of such things about whether to even repair
broken specimens), I think one walks a fine line of devaluing a piece just
for the sake of size. But, thats my opinion and not a rule. It may be just
dandy as long as you mention a repair date on the display card somewhere
so that a future purchaser knows exactly what they are getting.Mark

> Hi Mark,
> Very interesting information. I wish I had known this back when I did
> it. Do you know if epoxy is any different from the standard super
> glues in this regard?
> Thanks,
> Bob
>
>
> Subject: Re: [meteorite-list] Repairing broken meteorites
> From: <mafer_at_domafer.com>
> To: <lakewind_at_infi.net>
> Copies to: <meteorite-list_at_meteoritecentral.com>
> Date sent: Sun, 20 Oct 2002 02:02:05 -0400 (EDT)
>
>> Hi Bob and list
>> I'd just like to point out that super glues are"getters", they attract
>> water at the molecular level and could cause some detereoration to a
>> meteorite over time, how much and how noticable it would be I can't
>> say, possibly very small, but from working with pacemakers, I do know
>> that it attracted enough water to cause failure in the extended
>> studies. Pacemakers are typically backfilled with dry nitrogen to
>> insure that there isn't any atmospheric moisture inside the can. But
>> the components outgassed enough moisture which was accumulated by the
>> superglue (holding components to circuit board substrate) that it
>> allowed ionic bridges to form across the lands ehich caused the
>> failures.Mark
>>
>> > Hi Dave,
>> > I've used one of the several varieties of "Superglue" to repair two
>> > slices that have broken. Just apply sparingly so none drips over
>> > the edges and you'll be OK.
>> > Bob
>> >
>> >
>> > From: Dave Schultz <indy1996_at_yahoo.com>
>> > To: meteorite-list_at_meteoritecentral.com
>> > Subject: [meteorite-list] Repairing broken meteorites
>> > Date sent: Sat, 19 Oct 2002 21:07:32 -0700 (PDT)
>> >
>> >> Had a little accident with one of my meteorites
>> >> [broke in half] and was wondering if there was any way
>> >> of trying to repair it. The break seems to be clean
>> >> and is there any type of; I hate to say this: glue
>> >> that could be used very carefully to bring the halves
>> >> back together? Thanks, Dave.
>> >>
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Received on Sun 20 Oct 2002 11:33:44 PM PDT