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July 2006

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Subject:
From:
Lee parker <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Lee parker <[log in to unmask]>
Date:
Mon, 17 Jul 2006 17:38:37 -0400
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Eddie

Most immersion silver chemistries include an anti-tarnish over coating. If
however you need some additional protection you might try an aqueous
immidazole coating. Immidazole is a compound that can be purchased from most
chemical houses and was used successfully as an OSP by AT&T for many years.

Best regards

Lee

J. Lee Parker, Ph.D.
JLP Consultants LLC
804 779 3389

----- Original Message -----
From: "Eddie Rocha" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, July 17, 2006 5:05 PM
Subject: [TN] silver anti-tarnish


> I've been asked by a customer to provide silver coated
> PCB's with an anti-tarnish coating. This is a first for me.
> Is anybody else applying an anti-tarnish to silver coated
> PCB's? Is this a typical expectation from PCB assemblers?
> Will any anti-tarnish suffice or does silver require a
> specific anti-tarnish?
>
> Thank you in advance,
> Eddie Rocha
>
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