To answer the original question, isn't it true that
the immersion silver is very prone to handling
damages. Any immersion reaction(e.g. immersion
silver, immersion tin) would result in a very thin
coating. From what I know, the reason there are paper
separators is to protect the surface finish from
handling damage. It is also true that silver would
react with any sulfur in paper so at the very least,
the paper separator should be sulfur-free paper. So I
believe that any immersion silver boards which are
packed containing several boards should be separated
by a sulfur-free paper.
--- Joe Lee <[log in to unmask]> wrote:
> Mr. Abbott:
> I will be ordering a number of PCBs with
> Ag-Immersion. Is the silver saver
> paper necessary if the PCBs are used in assembly
> within a years time?
> I was told that Ag-Immersion finish on PCBs has a
> shelf life of one year.
>
> Regards
> Joe Lee
> Nortel Networks
> Phone: (613) 763-5916
> Fax: (613) 763-1961
> E-mail: [log in to unmask]
>
>
> -----Original Message-----
> From: Abbott, Donald
> [mailto:[log in to unmask]]
> Sent: Wednesday, May 12, 2004 9:46 AM
> To: [log in to unmask]
> Subject: Re: [LF] Protective Paper used to Protect
> Im. Ag Boards?
>
>
> Martin,
> The Daubert VCI webpage is somewhat misleading as it
> shows quite a bit about
> "volatile corrosion inhibitors". This isn't how
> silver saver paper works.
> No compounds are deposited on the surface of the
> wrapped part except by
> mechanical transfer of "zinc- compound dust" that
> rubs off the paper
> surface.
>
> Here is the address for the Daubert silver saver
> paper - is listed under the
> non-ferrous section.
>
> http://www.daubertvci.com/silversaver.asp
>
> VCI's are routinely used to protect Cu surfaces,
> such as base metal from Cu
> mills. They can be delivered impregnated in
> interleaving paper or by emitter
> packets and they do deposit a thin layer of organic
> compound on the surface
> of the active copper. They are closely ated to
> OSP's. Benztriazole and
> similar planar molecules that sublime easily are
> typical.
>
> Regards,
> Don Abbott
>
>
>
> -----Original Message-----
> From: Leadfree [mailto:[log in to unmask]] On Behalf
> Of Martin Cook
> Sent: Wednesday, May 12, 2004 8:21 AM
> To: [log in to unmask]
> Subject: Re: [LF] Protective Paper used to Protect
> Im. Ag Boards?
>
> Try www.daubertvci.com
>
> Martin Cook
>
>
>
>
> -----Original Message-----
> From: Anderson, Richard
> [mailto:[log in to unmask]]
> Sent: May 11, 2004 5:02 PM
> To: [log in to unmask]
> Subject: Re: [LF] Protective Paper used to Protect
> Im. Ag Boards?
>
>
> The paper contains a vapor phase inhibitor (a
> chemical that has significant
> vapor pressure inside the package to react with
> other gases) that prevents
> the silver from being attacked by oxygen and
> especially sulfur. There are
> also papers for copper.
>
> Dick Anderson - 978-442-5165
>
> -----Original Message-----
> From: Leadfree [mailto:[log in to unmask]] On
> Behalf Of Richard Kraszewski
> Sent: Tuesday, May 11, 2004 11:56 AM
> To: [log in to unmask]
> Subject: [LF] Protective Paper used to
> Protect Im. Ag Boards?
>
> A colleague of mine recalls reading that immersion
> silver boards must be
> shipped with paper separators between each board.
> He can't remember the
> reason and isn't sure if it was a industry standard
> or specific customer
> requirement. I vaguely recall something similar
> that was used for component
> shipping.
>
> Does this sound familiar to anyone? If so please
> provide details.
>
> Thanks
>
> Rich Kraszewski
>
> Advanced Manufacturing Engineer - KEDS
>
>
>
>
>
>
>
>
>
>
>
>
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