Just a quick question... 

When specifying 'plugged' vias using LPI soldermask... what is the actual
process used to accomplish this procedure? How do you make sure the vias are
plugged and what is the proper acceptance criteria used to verify and
inspect the finished results? What is an acceptable plugged via vs. a
reject? Is there a spec or standard that spells this out process and
inspection criteria and method for reference?

Thanks in advance... 


Bill



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