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August 2010

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Subject:
From:
Bev Christian <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Bev Christian <[log in to unmask]>
Date:
Mon, 16 Aug 2010 12:23:30 -0400
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Jack,
Why doesn't EVERYONE use matte masks if it can mitigate a potential problem
like solderballs?
Answer: because some point-haired bosses like shiny boards.  Certainly this is not the case with RIM bosses, but in some companies...

Secondly:
Are minor soldermask scratches a rejectable condition? I couldn't find any
reference to minor scratching in IPC-SM-840, IPC-6012 or IPC-A-600
Answer: it depends on what you mean by minor.  If it doesn't break through the actual solder mask, I would just leave it. If it shows a little copper, whether ground plane or trace, we apply a little solder mask from a pen. We have first tested and approved the replacement mask first (with regards to corrosion).

Bev
RIM

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
Sent: Monday, August 16, 2010 12:12 PM
To: [log in to unmask]
Subject: [TN] Matte Mask and SolderBalls

Greetings,

Here's a situation I'm trying to resolve: An assembly partner requests matte
soldermask to reduce the effect of solderballs. A fabrication partner wants
an extra 3% for matte, Their default is semi-matte or semi-gloss (are those
the same?) explaining that matte boards are slipsheeted throughout
subsequent processes to reduce scratching. I'm tasked with trying to save my
company the 3% increase on every board order. We have designs with both wave
and reflow soldering passes.

I've searched the last ten years of the Technet Archives for every reference
to solderballs and matte soldermask. I learned a lot from previous posts
(THANKS, TECHNET!) and many people have commented on the fact that
solderballs don't stick to matte masks as much as they do to others.

My first question is:
Why doesn't EVERYONE use matte masks if it can mitigate a potential problem
like solderballs?

Secondly:
Are minor soldermask scratches a rejectable condition? I couldn't find any
reference to minor scratching in IPC-SM-840, IPC-6012 or IPC-A-600

onward thru the fog,
Jack


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