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May 2000

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Subject:
Re: Solder mask post HASL staining
From:
Robert Welch <[log in to unmask]>
Reply To:
[log in to unmask]
Date:
Mon, 8 May 2000 17:47:29 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (54 lines) 
yep,
Could be lack of cure due to the higher heat mass.  Could try a U.V. bump
also.
Also some mask tend to haze worse than others if not allowed to cool down
prior to washing. We rack panels for one HASL "cycle" prior to washing for
to prevent the same problem on heavy panels.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Denis J. Dionne
Sent: Monday, May 08, 2000 4:51 PM
To: [log in to unmask]
Subject: [TN] Solder mask post HASL staining


Hi to all,

Has anyone ever dealt with a "water like" staining pattern on solder mask
surfaces processed through HASL?  We suspect the SM cure cycle since
rebaking the boards makes the stains disappear.  The stains seem to be
within the solder mask (Probimer 77) and only appear after the HASL line.
It also seems to hit high heat mass boards worse.

Denis Dionne
Coretec

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