Thank you Joe, Mike, and Richard, for your quick and concise responses. I
appreciate it.
If you ever happen across exactly where the cleanliness levels for various
PCB types are documented, I'd appreciate another message. All I've been
able to find in 6012 is a generic 1.56uM, with no mention of particular
surface finish. Likewise elsewhere.
I have a copy of IPC-TR-583, but if it addresses this issue I've not
located that area. Likewise have skimmed 600G and the TM-650 entries.
Thank you for being here, TECHNET.
-Chris
"Stadem, Richard D."
<[log in to unmask] To: [log in to unmask]
> cc:
Sent by: TechNet Subject: Re: [TN] bareboard cleanliness related to
<[log in to unmask]> surface finish
09/12/2006 05:32 PM
Please respond to TechNet
E-Mail Forum; Please
respond to "Stadem,
Richard D."
Somewhere in the IPC PWB standards, there are cleanliness levels listed
for the different types of PWBs. I think it is listed in 6012, but I am
not sure. But I know I have seen the spec. and there are different
levels of ionic cleanliness required for different surface finishes.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joe Russeau
Sent: Tuesday, September 12, 2006 3:33 PM
To: [log in to unmask]
Subject: Re: [TN] bareboard cleanliness related to surface finish
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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