In our designs we use .005" spacing for LPI solder mask and have had very good success. Most PCB manufacturer would be willing to set up a minimum standard per their process. ______________________________ Reply Separator _________________________________ Subject: FAB:ASSY:pad spacing Author: [log in to unmask] at SMTPpost1 Date: 4/18/96 9:03 PM Typically, what is the minimum spacing between printed circuit solder pads that would allow for enough LPI soldermask to prevent bridging for a wave soldering process ? Is there a design guideline that specifically addresses this ? If so, can you point me in the right direction. Any assistance would be greatly appreciated. Thanks