Follow this link.
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Guy Ramsey
Sent: Thursday, September 15, 2011 6:35 PM
To: [log in to unmask]
Subject: Re: [TN] ENIG versus LFHASL
During these discussions did the topic of leaching come up?
I have a vague memory of a study on this, where enough of the knee dissolved
into the coating to cause problems in subsequent soldering operations?
Anyone?
Guy
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting
Sent: Thursday, September 15, 2011 1:01 PM
To: [log in to unmask]
Subject: [TN] ENIG versus LFHASL
Hello Technetters,
We are having a discussion about the merits of both ENIG and LFHASL. In
2006 when we switch to a RoHS compliant process we evaluated many board
finishes and decided, for our volumes, that although ENIG was more expensive
it was more robust. LFHASL wasn't ready for prime time, Immersion Silver
was great but required careful storage and handling, OSP was not something
that fit our process.
Now that LFHASL appears to be more main stream we are reconsidering it.
ENIG is not always done in-house at some of our fab shops, so that adds time
and money to the delivery. These shops now have LFHASL in-house, so there
is a potential for some savings here. We have been given stories of storage
issues with LFHASL and other concerns too.
As I recall, the industry recommended method of storage of bare circuit
boards is in a sealed bag with desiccant, regardless of board finish.
Leaving bare boards unwrapped and in an open bin is just plain bad practice
especially if near the ocean.
Several of us here think LFHASL is now right for our processes.
Please advise if we are off base.
Phil Nutting
Design for Manufacturing Engineer
Kaiser Systems, Inc.
126 Sohier Road
Beverly, MA 01915
Phone: 978-922-9300 x1310
Fax: 978-922-8374
e-mail: [log in to unmask]<mailto:[log in to unmask]>
www.kaisersystems.com<http://www.kaisersystems.com>
www.linkedin.com/in/philnutting<http://www.linkedin.com/in/philnutting>
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