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Mon, 14 Jan 2002 21:05:34 EST |
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In a message dated 1/14/02 7:33:36 AM Pacific Standard Time,
[log in to unmask] writes:
> Amazingly, I have seen HASL surfaces very flat, shiney, bright, and
> solderable
Earl: I also have seen such surfaces....and I remember clearly where I saw
them.
The salient features of the process were:
A CONTINUOUS process line....essentially ZERO time, between processes.
Oxide removal--(usually done with a microetch)....in this case done with a
cleaner that removed only a trace of Copper, then, rinse, barely dry
(unheated), flux application, then to HASL immediately....beautiful results,
pretty and flatter than I have ever seen elsewhere.
Well done, its almost a shame HASL cannot be used universally.
Rudy Sedlak
RD Chemical Company
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