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May 2008

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Subject:
From:
Guy Ramsey <[log in to unmask]>
Reply To:
Date:
Tue, 13 May 2008 10:34:55 -0400
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Ah yes, and chairs. Our chairs have stainless steel woven in.  Nice one Rex.


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Leland Woodall
Sent: Tuesday, May 13, 2008 10:27 AM
To: [log in to unmask]
Subject: Re: [TN] Stainless Steel Contamination Question

Rex,

At this point, no long shot is out of the question.

Thanks for your reply!

Leland

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Rex Waygood
Sent: Tuesday, May 13, 2008 10:21 AM
To: [log in to unmask]
Subject: Re: [TN] Stainless Steel Contamination Question

Check nobody has an old ESD coat. I believe they used to use stainless steel
in the fabric.  (Long Shot) Rex 


Rex Waygood
Technical Manager
 
PartnerTech Poole Ltd
Benson Road
Poole
Dorset BH17 0RY
United Kingdom
 
Tel: +44 (0)1202 674333
Fax: +44 (0)1202 678028
DDI: +44 (0)1202 338222
Mob: +44 (0)7887 997403
 
[log in to unmask]
www.PartnerTech.co.uk

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Leland Woodall
Sent: 13 May 2008 14:47
To: [log in to unmask]
Subject: [TN] Stainless Steel Contamination Question
Importance: High

Hi Everyone,

 

We've had a problem lately with fine strands of stainless steel wire being
found on top of some of our .5 mm pitch ICs.  This has caused both internal
and external issues, and we've yet to identify the source.

 

It's definitely formed wire, with a thickness ranging from 7 to 10 microns,
and up to 3 mm in length.  

 

Our automated optical inspection stations can only reliably detect widths of
12 to 15 microns.

 

I've checked the internet in an attempt to find common applications of this
wire.  I've found two, and they were for ultra-fine filters and stencil
screen mesh.  We've investigated (I think) all of our machinery that would
utilize filters this small and have found no such usage.
I've also checked every stencil in our plant, and all of our mesh material
is some type of a plastic compound.

 

Do you have any idea where this stainless steel might be coming from?

 

Any suggestions would be sincerely appreciated!

 

Thanks,

 

Leland


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