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June 2006

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Subject:
From:
"Victor G. Hernandez" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Mon, 5 Jun 2006 07:57:08 -0500
Content-Type:
text/plain
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I suspect that handling IMAg surface PWBs is a glove operation.   Is
there IPC supportive guidelines/documentation/standard.

Victor,

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Franklin D Asbell
Sent: Monday, June 05, 2006 7:42 AM
To: [log in to unmask]
Subject: Re: [TN] Packaging requirements for IAg Finished PWBs

If they touch each other you have a risk of scratches or more likely,
rubbed
or abrasion marks. These each would typically not be a problem unless
they
exposed copper, they appearance is what throws most inspectors off. When
you
see rub or abrasion marks on immersion silver it may make the surface
very
shiny, this causes inspectors or even line people to think this is a
problem.

If the bag they are in contact with contains sulfur you risk
contamination
of the silver finish, this is evident by the surface turning dull brown
to
black. If the bag has been contaminated by chlorides (your fingers
inside
the bag opening it up or during packaging) then the surface may turn
very
dull, to yellow.

Franklin

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor G. Hernandez
Sent: Monday, June 05, 2006 7:00 AM
To: [log in to unmask]
Subject: Re: [TN] Packaging requirements for IAg Finished PWBs

What can occur if IMAg silver surface finishes touch each other and/or
the bag.

Victor,

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gerald Gagnon
Sent: Saturday, June 03, 2006 10:40 AM
To: [log in to unmask]
Subject: Re: [TN] Packaging requirements for IAg Finished PWBs

Jeffery,

Oops. disagree with you here.... ImAg surfaces must never touch while in
the
package nor should they touch the bag..

I'd be more than willing to pay for this. Can we trade the cost for
leaving
out the useless desiccant?

Gerry


From: Jeffrey Bush <[log in to unmask]>
Reply-To: TechNet E-Mail Forum <[log in to unmask]>,              Jeffrey
Bush
<[log in to unmask]>
To: [log in to unmask]
Subject: Re: [TN] Packaging requirements for IAg Finished PWBs
Date: Fri, 2 Jun 2006 11:42:35 -0400

Recommend VAC PAC with not interleaving.  Interleaving is and added cost
that is not needed as the boards are held tight in the VAC PAC.

Jeffrey Bush
Director, Quality Assurance and Technical Support
VERMONT CIRCUITS INCORPORATED
            76 Technology Drive - POB 1890
               Brattleboro, Vermont 05302
                 Voice - 802.257.4571 ext 21
                     Fax - 802.257.0011
                        <http://www.vtcircuits.com/>

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gary Camac
Sent: Thursday, June 01, 2006 10:47 AM
To: [log in to unmask]
Subject: [TN] Packaging requirements for IAg Finished PWBs

Good morning all,

I am struggling through a rewrite of our material specification for
PWBs.  I
have seen the recommendation that cover sheets and interleaf sheets
should
be used to prevent scratches on IAg finished PWBs.  Have those that are
using IAg seen this as necessary?  We eliminated this requirement on
Sn/Pb
finished PWBs some time ago without any negative effects.

Thanks,

Gary Camac

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