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September 2011

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Subject:
From:
Inge Hernefjord <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Inge Hernefjord <[log in to unmask]>
Date:
Thu, 15 Sep 2011 19:37:03 +0200
Content-Type:
text/plain
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text/plain (94 lines)
Phil Nutting,
it should be no problem whatever you select if you have a normal production
rate. Where I used to work, there came a truckload with boards in the
morning and before the week was gone, all boards were ready for shipment.
With such a short storage in air, I think it does not matter which finish
you use, because the boards Feel Nothing.   If the boards are stored for
months, then I think ENIG boards ought to be vacuum or Nitrogen bagged.

I can tell you that the company I refer to, has until today consumed more
than five millions ENIG boards.

//Inge

On 15 September 2011 19:00, Phil Nutting <[log in to unmask]> wrote:

> 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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