Blair,

I think micro sections of the old board and the new one will really get you
the answer about gross failure or changes that will help you to give the
right specification next order.

Other way around is to check the board by arc test meter that are used for
paint tests.
You can test for 150V or more at the desired area to be confident about your
boards before assembly.
But it will be problem to find a PCB fabricator that can/want to do the
tests.

Ido Mashall
Beyond materials Ltd.
 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Hogg, Blair K.
Sent: Thursday, July 05, 2007 6:37 PM
To: [log in to unmask]
Subject: [TN] Soldermask Thickness

We switched PC board suppliers for one of our products a while back and
have started having hipot issues with components that are connected to
main 110VAC input voltage arcing through the soldermask to tracks
underneath at 1200V hipot voltage. 

I'm pretty sure I'll get a few responses that say that we shouldn't be
using the soldermask as an insulator, however, since the change in
supplier seems to coincide with the onset of problems, I've been asked
to evaluate the soldermask thickness as a potential contributor to the
problems. 

I would some recommendations on how to measure the thickness of the
soldermask. 

Thanks,

Blair

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