RIGHT!! No matter how you slice it...............
As the Whittaker virus approaches epidemic level..........
Doug Pauls
"Stadem, Richard D." <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
02/01/2011 01:36 PM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
"Stadem, Richard D." <[log in to unmask]>
To
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cc
Subject
Re: [TN] PCBA Water Wash
Now, those are sharp words, Dewey! We can't have esteemed members of the
Forum cutting each other down like this.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey
(EHCOE)
Sent: Tuesday, February 01, 2011 1:17 PM
To: [log in to unmask]
Subject: Re: [TN] PCBA Water Wash
So you're saying the use of an air knife just doesn't cut it?
Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paul Edwards
Sent: Tuesday, February 01, 2011 12:02 PM
To: [log in to unmask]
Subject: Re: [TN] PCBA Water Wash
I disagree with Bob...
I have never seen an air knife remove water from all the spaces that can
be on a board...
The work fine if you have plenty of clearance between ALL surfaces...
I have seen air knives drive water into spaces where to water's natural
surface tension would NOT allow it to go...
When the water evaporates, if it evaporates, it leaves the
organo-halogen complexes that supply base materials for dendritic
growth...
Paul
Paul Edwards
Process/Quality Engineering
Surface Art Engineering
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner
Sent: Tuesday, February 01, 2011 10:23 AM
To: [log in to unmask]
Subject: Re: [TN] PCBA Water Wash
City water is fine if it is removed (air knife) prior to drying.
Run the number on dissolved solids content and calculate or weigh the
amount
of later left on the board. With a simple blow off you will find the
remaining ionic content is very tiny.
Get ionic contamination tests done. City or DI that test results are the
important issue.
Bob K.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Forrester, Michael
(H
USA)
Sent: Tuesday, February 01, 2011 12:08 PM
To: [log in to unmask]
Subject: [TN] PCBA Water Wash
I have three questions I hope someone can help me with:
1) We have a vendor that uses "city water" directly into their SMT
PCA
washer. I believe DI water is industry standard.
Does anyone know if it is documented anywhere? Spec?
2) We had an issue where there was Chlorine contamination and gold
dendrites found inside some standard gull-wing 6 pin SMT ICs.
This issue seems to be batch related. The chip manufacturer
claims
that chlorine is never used in their process. Should the SMT
process expect to handle the possibility that the wash solution
may
get into a part? The PCA vendor uses unfiltered "city water",
with no cleaner, in the wash process and does a ROSE test on one
board of each lot. Since the ROSE test passes, the PCA vendor
is blaming the part manufacturer for having "leaky" parts, since
the
thinking is the wash is getting into the part and trapped.
3) One issue I have is the water pressure in the wash is 80-100 psi.
I think this is too strong, and should be half of that? You want to
flood the board with water, not hit the board and bounce off?
Thank you in advance.
Best Regards,
Michael Forrester
Sr. Product Engineer
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