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From [log in to unmask] Mon Aug 5 17: |
27:02 1996 |
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Hello Technet,
We are having difficulty maintaining our HASL pot below 0.25% Cu, even
with 2x daily drossing. The machine is an old vertical Electrovert
with less than easy access.
- Is this 0.25% more critical at assembly than at fab?
- What is the practical USL for copper in HASL?
- How often should metal contaminants be measured?
- Should drossing be done at a constant frequency, or based on panel
loading?
- Are there any studies out there correlating HASL quality with Cu
contamination level?
- Any special recommended procedures or tools?
As always, we appreciate any input.
Joe Felts
PC World, Toronto
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