[meteorite-list] Recommended humidity for public display

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From: mark ford <markf_at_meteoritecentral.com>
Date: Thu Apr 22 10:29:53 2004
Message-ID: <6CE3EEEFE92F4B4085B0E086B2941B3101435C_at_s-southern01.s-southern.com>

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=20
Rob
=20
The rust cycle is certainly highly dependent on temperature, the lower
the better as far as I am concerned (i.e slower reaction rate) be
careful about 120F will it not accelerate the rust cycle even at 30%? I
guess also getting rid of atmospheric pollutants such as SO2 and
Chlorine is important too...
=20
So I guess it's room temp coupled with low RH (dessicant!) with VCI's
too of course (I use them all the time)
=20
My only concern about having too low an RH is many of the minerals in
older meteorites are water induced terrestrial byproducts and behave
much differently than the original meteoric material, and who knows what
'aqueous chemicals' are holding a weathered meteorite together
(especially in the softer C types!)=20
=20
I say all this because I put a really weathered small NWA into a box of
dessicant sometime ago and after a few months it broke in half! Maybe
coincidence but...?
=20
But I guess we have to draw a lesson from the Antarctic meteorites,
laying in a frozen sea water environment for thousands of years, but a
low RH keeps them preserved!!
=20
Mark F.
=20

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<o:p> </o:p>

Rob<o:p></o:p>

<o:p> </o:p>

The rust cycle is certainly highly
dependent on temperature, the lower the better as far as I am concerned =
(i.e
slower reaction rate) be careful about 120F will it not accelerate the =
rust
cycle even at 30%?  I guess =
also getting
rid of atmospheric pollutants such as SO2 and Chlorine is important =
too…<o:p></o:p>

<o:p> </o:p>

So I guess it’s room temp =
coupled
with low RH (dessicant!) with 
VCI’s too of course (I use them all the =
time)<o:p></o:p>

<o:p> </o:p>

My only concern about having too =
low an
RH  is many of the minerals =
in older
meteorites are water induced terrestrial byproducts and behave much =
differently
than the original meteoric material, and who knows what ‘aqueous
chemicals’ are holding  =
a
weathered meteorite together (especially in the softer C types!) =
<o:p></o:p>

<o:p> </o:p>

I say  all this because I put a really weathered small NWA into a box of dessicant =
sometime
ago and after a few months it broke in half!  Maybe coincidence =
but…?<o:p></o:p>

<o:p> </o:p>

But  I guess we have to draw a lesson =
from the
Antarctic meteorites, laying in a frozen sea water environment  for thousands of years, but a =
low RH keeps
them preserved!!<o:p></o:p>

<o:p> </o:p>

Mark =
F.<o:p></o:p>

<o:p> </o:p>

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=00
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Received on Wed 10 Sep 2003 06:01:46 AM PDT

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