That's why the HASL bath should have solder alloy with certain amount of
copper, to reduce the copper dissolution.
Reuven
On Sat, Sep 17, 2011 at 10:28 PM, Mike Fenner <[log in to unmask]> wrote:
> Try again!
> Follow this link
>
> http://www.npl.co.uk/content/ConPublication/4301
>
> Mike
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Fenner
> Sent: Saturday, September 17, 2011 8:06 PM
> To: [log in to unmask]
> Subject: Re: [TN] ENIG versus LFHASL
>
> 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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--
Best Regards,
*Reuven Rokah*
Mobile: 972-52-60-120-18
Tele-fax: 97239360688
<http://www.rokah-technologies.com/>[log in to unmask]
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