Joe, here are my comments about your HASL.

OUr guys clean the pot once per day.  The machine is only used on second 
shift.

When we got a new Quicksilver machine about 2 years ago, it looks like Cu 
contamination went down, according to our SPC chart.  The operators say 
it is easier to clean the new machine than the old one.

We have an SPC chart to monitor Cu in the pot.  On the 5th and the 20th 
of each month, the operator pulls a sample slug to be sent out for analysis.

Lou Hart


.

On Mon, 5 Aug 1996, joef wrote:

>      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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