George
I would think that other gold finishes such as flash gold would have the
same shelf life as ENIG.
Best regards
Lee
----- Original Message -----
From: "George Milad" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, April 28, 2006 10:22 AM
Subject: Re: [TN] Shelf life of ENIG circuit board plating
> Of all the non HASL surface finishes ENIG is the most durable and has
> the
> longest shelf life.
> ENIG will survive standard storage conditions (exposed to ambient air) for
> periods exceeding 12 months.
> The same cannot be said about silver or tin.
> Immersion silver will require resealing (not necessarily vacuum and all)
> wrapping the boards in saram wrap to minimize prolonged exposure to sulfur
> bearing air is all that is needed.
> Immersion Tin has intermetallic issues that are formed over time sealed or
> not.
>
>
> Best regards
>
> George Milad
> [log in to unmask]
> National Accounts Manager for Technology
> Uyemura International Corporation
> Technical Center
> 240 Town LIne Rd
> Southington CT 06489
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>
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