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August 2008

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Subject:
From:
Victor Hernandez <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Fri, 22 Aug 2008 09:27:34 -0500
Content-Type:
text/plain
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text/plain (58 lines)
A photo is worth one thousands words.

Vic,

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Pete Houwen
Sent: Friday, August 22, 2008 8:31 AM
To: [log in to unmask]
Subject: Re: [TN] Measling

Ted,

Measling occurs in the laminate itself and doesn't affect the
soldermask.  If 
you are concerned about the mask, is it blistering, not measling?
Measling will 
be white dots in a pattern.   It's usually caused by thermal stress.
The fiber 
bundles separate at their intersections.  It's not uncommon, and
generally 
harmless if it's localized.   If what you are seeing is not a white spot
pattern, 
but random, it might be mask blistering, in which case you could have a 
problem if it allows conductors to be exposed as mask flakes off.  How
much 
do you trust your vendor in reporting results of their tape test (if
they did 
one)?

Pete

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