[meteorite-list] Meteorites and Humidity: Some Questions

From: Jerry Flaherty <grf2_at_meteoritecentral.com>
Date: Sat, 6 Mar 2010 13:36:10 -0500
Message-ID: <91003E07D3664B07A7287681C0260353_at_JerryPCwind7>

Interesting to a rather unsophisticated Dehumidifierer. I'll wait with bated
breath for responses from the List
Jerry Flaherty

--------------------------------------------------
From: "John Hendry" <pict at pict.co.uk>
Sent: Saturday, March 06, 2010 12:32 PM
To: <marco.langbroek at wanadoo.nl>
Cc: <Meteorite-list at meteoritecentral.com>
Subject: Re: [meteorite-list] Meteorites and Humidity: Some Questions

> These may be daft ideas or already tried, but apart from dessicant removal
> of moisture what about another line of attack...
>
> (1) Removal of oxygen from the container... fill it with argon or nitrogen
>
> (2) Scavenge oxygen from the container. The food industry deploys
> scavenger
> sachets to remove oxygen from packaging and the most popular seem to be
> sachets of iron filings. Probably these will oxidise quicker than the
> meteorite given the larger surface area and absence of nickel.
>
> http://www.nitro-pak.com/product_info.php?products_id=366
>
> (3) UV activated scavenging polymers exist but these seem designed for
> final
> depletion of an already low O2 atmosphere <2%. Might work in conjunction
> with (1).
>
> http://www.sealedair.com/products/food/os/oxygen_scavenging.html
>
> (4) Use zinc as a sacrificial scavenger. Perhaps pack a perforated
> non-conducting false bottom to the container with zinc wool thus isolating
> it from contact with the specimen.
>
> (5) Treat the specimen with vapour phase corrosion inhibiters. This will
> form a molecular film on the specimen so I'm not sure of whether there
> would
> be any alteration in the visual appearance of the specimen, or any other
> undesirable side effects.
>
> http://www.agmcontainer.com/vci/index.htm
> http://www.agmcontainer.com/vci/vci_faqs.html
>
> Regards,
> John
>
>
> -----Original Message-----
> From: meteorite-list-bounces at meteoritecentral.com
> [mailto:meteorite-list-bounces at meteoritecentral.com] On Behalf Of Marco
> Langbroek
> Sent: March-06-10 3:11 AM
> To: meteorite-list at meteoritecentral.com
> Subject: Re: [meteorite-list] Meteorites and Humidity: Some Questions
>
>> I store them primarily in Riker boxes and some in the jewel cases they
>> arrived in. I live in north central Florida and except for my air
>> conditioned home, I don't have the meteorites in any other climate
>> controlled container or cabinet. I'm noticing a few of the irons
>> (Miles especially) and one or two of the stony irons to appear a
>> little rustier than when they arrived.
>
> I am actually not so fond of Riker mounts. Maybe it is our Dutch climate,
> but I noted specimens start to rust on the contact face between the Riker
> glass and the stone/iron: probably because moisture condenses there and/or
> gets trapped.
> This was while there was dessicant in (some) of the mounts.
>
> The problems vanished once I got myself a glass display cage. My
> meteorites
> are much more stable now.
>
> - Marco
>
> -----
> Dr Marco Langbroek - SatTrackCam Leiden, the Netherlands.
> e-mail: sattrackcam at wanadoo.nl
>
> Cospar 4353 (Leiden): 52.15412 N, 4.49081 E (WGS84), +0 m ASL
> Cospar 4354 (De Wilck): 52.11685 N, 4.56016 E (WGS84), -2 m ASL
> SatTrackCam: http://home.wanadoo.nl/marco.langbroek/satcam.html
> Station (b)log: http://sattrackcam.blogspot.com
> -----
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Received on Sat 06 Mar 2010 01:36:10 PM PST