Hi Technetters!
     Looking through the IPC, ANSI spec's, I cannot find anything that
     references a recommended via size for multi-layer (up to 6 layers)
     boards.

     These particular boards may or may not have surfcae mount on
     top-side, and all are wave soldered, .062" thick, with LPI solder mask
     both sides. Currently our vias are .018" +\- .003" finished hole size,
     solder-mask plugged from the solder side. We are discussing
     eliminating the plugging and going to .021", and relying on the wave
     to fill the holes with solder......

     Can you share your thoughts on what plated-thru via size works well
     for you, (also, do you solder-mask plug, no plug but wave solder fill,
     etc.???)

     Thanx in advance, oh guru's of the industry!! Jeff Hempton
     United Technologies Electronic Controls

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