By eliminating thermals at via locations you significantly increase the probability of creating pink ring. Depending on who you talk to will determine if pink ring is a functional defect or not. If your finished specification for your board manufacturer states "No pink ring allowed" you are setting him up for failure. If pink ring is a non issue with your company and this is reflected in your specification this is a non issue. The diameter of the center pad, width of the spokes and diameter of the clearance around the center pad are significant factors that contribute to the amount of pink ring present. *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ***************************************************************************