Hi Tom,
 
Have you looked at http://www.tet-halco.com/library.asp ?  Lots of detailed info there.
Another interesting discussion about controlling the HASL process (or better: the impossibility to do so) can be found in Moonman's book. The chapter about HASL gave me a totally new view on the subject. The Moonman can be reached at [log in to unmask], perhaps he's willing to send you this one chapter or otherwise you could just buy the book.
 
Daan Terstegge
http://www.smtinfo.net
 
 
----- Original Message -----
From: [log in to unmask] href="mailto:[log in to unmask]">Tom Parkinson - Quality System Manager - WinTronics, Inc.
To: [log in to unmask] href="mailto:[log in to unmask]">[log in to unmask]
Sent: Monday, September 23, 2002 9:42 PM
Subject: [TN] HASL

Hello all,

Have been looking for some kind of spec for HASL thickness and
uniformity. Having problems with small to fine pitch parts where HASL is
causing problems.

Only reference I can find so far is in 2221 where it says HASL is
checked not by mechanical thickness, but by the ability to solder per
JSTD003.
003 only talks about being able to solder - not about variability of
HASL causing problems.

My SMT people are giving me a hassle about the HASL......

Any suggestions??

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