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| >From willli Thu Jul 24 12: |
35:50 1997 |
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by ipc.org (Smail3.1.28.1 #2)
id m0wrRnZ-000BjyC; Thu, 24 Jul 97 12:35 CDT |
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| From [log in to unmask] Mon Jul 28 09: |
38:32 1997 |
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WAYTEC ELECTRONICS CORP |
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John,
Pertaining to the apparent contradictions contained in items #1 & #2,
as can often happen in this business they are both correct. Acid
will indeed help finish crosslinking the polymers if they have not
completely "kicked over". However a acid cleaner with a strong
oxidizer, such as free flouride or chloride ions, will also help
undercut and actually remove thin residues prior to surface
finishing. Because of this we have a chamber of solder stripper
prior to our conventional HASL micro-etch. We run it only rarely
when someone or some process up the line goes astray. Such developer
problems, excessive hold times, over tack curing, ambient U.V. light
ETC.
Robert E. Welch
Process Specialist
Email: [log in to unmask]
Modem: 804-239-9120
Fax: 804-237-3048
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