Most SS are not magnetic, but the magnetic ones are a bit special so
that may provide another clue.
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: 15 May 2008 01:26
To: [log in to unmask]
Subject: Re: [TN] Stainless Steel Contamination Question

John,
 
You might just have to board the jet.  We've brought in folks for lesser
atrocities.
 
We are looking into magnetic properties at the moment and detection
alternatives such as the one you mentioned.
 
Jeesh, why is stuff like this so difficult?
 
Puzzled but still looking,
 
Leland

________________________________

From: TechNet on behalf of John Burke
Sent: Wed 5/14/2008 5:18 PM
To: [log in to unmask]
Subject: Re: [TN] Stainless Steel Contamination Question



You will find it - even if I have to get on a
plane......................8-)

Run a powerful magnet such as samarium cobalt (get them at any
hobby/craft
store) through the reflow system (running but heaters off ) - and any
other process in the place.

When the magnets go in clean and come out covered in whiskers you found
the problem.

John



John Burke

(408) 515 4992

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Leland Woodall
Sent: Wednesday, May 14, 2008 10:39 AM
To: [log in to unmask]
Subject: Re: [TN] Stainless Steel Contamination Question

Blair,

You just brought smiles to the faces of the guys in the Quality
Department.

Sadly enough, your prediction is probably going to be accurate in every
way.

Leland

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Blair Hogg
Sent: Wednesday, May 14, 2008 1:15 PM
To: [log in to unmask]
Subject: Re: [TN] Stainless Steel Contamination Question

Here's my prediction - you'll never find the source of these. They will
go away on their own, leaving everybody to wonder from where they came.

Then, seven years from now, when everyone's forgotten about it, they
will return.

It is a wonder we're not all insane.

Blair

On Tue, 13 May 2008 09:47:15 -0400, Leland Woodall
<[log in to unmask]> wrote:

>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.
>
>
>


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