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March 2003

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From:
David Douthit <[log in to unmask]>
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TechNet E-Mail Forum.
Date:
Fri, 21 Mar 2003 11:16:32 -0700
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Mercury will corrode aluminum at warp speed!!

David A. Douthit
Manager
LoCan LLC

Tim Reeves wrote:

> I think it's not so much that it's pressurized, actually atmospheric pressure in a submarine is on the low side (I served on one from 1988-92) but that it's enclosed with a recirculated atmosphere. In a submarine, oxygen is replenished, CO2 is scrubbed out and CO and hydrocarbons are oxidized, but certain contaminants are harder to remove.
> Mercury vaporizes enough to be a concern under standard conditions, and normally things vaporize more as the pressure is lowered.
> But you're right that it's not too surprising to receive a request for mercury-free certification.
>
> Best Regards,
> Timothy Reeves
> Technical Service Engineer - Matsushita Electronic Materials, Inc.
> 4114 Heather Street, Forest Grove, Oregon, 97116
> Main (503) 357-8695     Direct (503) 992-5109    Cell (503) 781-1495     Fax (503) 357-8868
>
> -----Original Message-----
> From: Quality [mailto:[log in to unmask]]
> Sent: Thursday, March 20, 2003 1:40 PM
> Subject: Re: Mercury Free Cert
>
> Mark,
>
> This is a fairly common request - especially for product that is
> going into a pressurized vessel.  (Submarines, airplanes etc.)
> Seems mercury has a nasty habit of vaporizing under pressure.
>
> Anyway, we went through the effort a few years ago to assure no
> mercury is used in any materials we use - there were none.  What
> you have to watch for is the use of things that contain mercury like
> thermometers.
>
> pete
> [log in to unmask]
>
> On 18 Mar 03, at 7:46, Mark Hargreaves wrote:
>
> > Hi All,
> > Seems to be my month for receiving unusual certification requests from our
> > bare board customers.
> >
> > Yesterday, a customer asked us to certify that our boards (or is it our
> > processes?) are "mercury free".
> >
> > Before I start sifting through MSDS's, is anyone aware of any PCB materials
> > (FR4), chemistries or processes that typically contain mercury?
> >
> > Are there any good info sources out there regarding mercury & PC fab?
> >
> > Many thanks for your responses to all of my past questions.
> >
> > Mark Hargreaves
> >
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>
> Peter Menuez
> QA Manager
> Proto Circuit, Inc.
> 330-572-3400
>
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