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Date: | Wed, 5 Jul 2006 13:34:31 -0700 |
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hi,
i am exploring the possibility of stripping immersion tin off the copper
pads of a qfn package and replating them with immersion silver. is this
being done by anyone? if you don't mind i'd like not to get into the
'why's' of doing this.
thanks,
phil
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jeffrey Bush
Sent: Wednesday, July 05, 2006 11:46 AM
To: [log in to unmask]
Subject: Re: [TN] Rocha Laminate Voids..
Cascade also works very well for flux - leaves low ionics and never
seemed to present an issue.
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 Jose Marroquin
Sent: Wednesday, July 05, 2006 1:37 PM
To: [log in to unmask]
Subject: Re: [TN] Rocha Laminate Voids..
All,
Recently we clean up residue on some boards with multipurpose Mr. Clean.
Should I expect problems from it?
Thanks.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Susan Mansilla
Sent: Wednesday, January 04, 2006 5:16 PM
To: [log in to unmask]
Subject: Re: [TN] Rocha Laminate Voids..
If they are in the prepreg and are present as pressed, then there is a
mismatch between the prepreg and pressing conditions. Are you able to
do a flow test on some sheets of prepreg alone to see if the % flow is
as expected?
Can
you determine if you are getting the predicted thickness of the prepreg
layer? Are you able to determine if you are hitting the correct temp
before you hit the higher pressure during the lamination cycle?
Is the excess around the edges of the panel "frothy" in appearance?
Just little thoughts that I would use to attack and "fix" the problem.
Susan
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