Re: Storage in plastic "food storage" bags

[P3D Dr. Bob Wier <wier@xxxxxxxxxxxxxxx>]

Here's kind of an interesting posting from another list that I'm on -
makes one pause when considering what kind of containers to use for
archival/long term storage..

--BW


--- begin forwarded text
|Delivered-To: rete-outgoing@xxxxxxxxxxxxxxxxx
|Date: Fri, 20 Jun 1997 08:17:05 +0100
|To: rete@xxxxxxxxxxxxxxxxx
|From: Mike Cowham <mike-cowham@xxxxxxxxxxxxxxxxx>
|Subject: Re: Storage in plastic "food storage" bags
|Mime-Version: 1.0
|Sender: owner-rete@xxxxxxxxxxxxxxxxx
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|Reply-To: rete@xxxxxxxxxxxxxxxxx
|Status:   
|
|We are in the electron microscope business and have to produce 'clean'
|vacuum parts.  We used to store and ship these in standard plastic bags.
|Some of our customers complained, and they advised us to use
|polyethylene.  In some cases newly machined and cleaned phosphor bronze
|parts would turn black within a few weeks.  Standard pvc and similar
|bags do give out certain chemicals, chlorine being one of the worst.  
|        Since we have used polyethylene, there have been no
|contamination problems.  
|        I have not found a source of polyethylene zip-top bags, but we
|use a simple heat sealing machine.  I now have the confidence to store
|any parts in these bags.  I have even used them for delicate historic
|instruments.
|        Polyethylene is available on rolls in a flattened tube form in
|various widths from most plastics suppliers.
|
|                Regards,
|                Mike Cowham.
|        The Mount, Toft, Cambridge CB3 7RL.
|--- end forwarded text



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