Check to see if the mask has ammonia. We had to change masking because the
ammonia was tarnishing not only silve but bare copper.

-----Original Message-----
From: Matthew Lamkin [mailto:[log in to unmask]] 
Sent: Friday, 25 February 2005 4:21 AM
To: [log in to unmask]
Subject: [TN] Peelable mask on Sterling Silver coatings?

Hello, has anyone any experiences of peelable mask on MacDermid Sterling
Silver coated FR4 boards?

We have just been going through the process of changing our board spec to
silver coating for all, but the peelable process seems to give us a bit of a
problem.

AFAIK The peelable goes through an oven to cure it, which seems to tarnish
the silver.

Has anyone any recommendations/suggestions that I can pass onto our supplier
to allow us to have our boards that use peelable silver coated too?

Thankyou,
Matthew Lamkin.

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