Hi Chris,

The short answer to your question is yes.  I would expect (typically) HASL
boards to be "dirtier" than ENIG boards.

Best Regards,

Joe Russeau
Process Analyst

Precision Analytical Laboratory, Inc.
4106 Cartwright Dr. Ste. A
Kokomo, IN 46902

P: 765-455-1993
F: 765-455-1996
E: [log in to unmask]

----- Original Message -----
From: "Chris Ball" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, September 12, 2006 2:19 PM
Subject: [TN] bareboard cleanliness related to surface finish


> Hello Gurus-
>
> Is it fair to expect a higher contamination on a HASL finished bareboard
> than, say ENIG? I would have expected the same level of cleanliness when
> receiving the bareboards, but new supplier says they have different levels
> for different finishes.
>
> We specify tighter than std. IPC levels and never varied the spec due to
> surface finish. Requests for exceptions have been rare and not related to
> surface finish.
>
> Any comments appreciated,
> -Chris
>
>
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