Dan,

 Laser imaged mask, what does that cost compared to low cost "Conventional"
mask?

 What kind of tolerance does that hold, this might be very useful for fine
pitch boards.

Thanks,
Bob Kondner

 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dan Skweres
Sent: Monday, August 16, 2010 1:26 PM
To: [log in to unmask]
Subject: Re: [TN] Matte Mask and SolderBalls

From a Fabricators standpoint(I'm not speaking for all) we run into this 
scenario at times. We like to use LDI (laser direct image) mask for its 
accuracy especially with mask defined BGAs. Unfortunately our supplier of 
mask currently does not offer a matte option. Flip a coin.
Dan S
----- Original Message ----- 
From: "Jack Olson" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, August 16, 2010 12:12 PM
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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