One needs to keep in mind the via to via spacing allowed in the design. If your 35 mil vias can reside on 50 mil centers, a row of vias will effectively build a moat in the plane if you use an anti pad of 55 mils. This is why we use a 45 mil anti pad on our vias. Another 2 cents worth... Ken Barrett Cisco Systems San Jose CA [log in to unmask] 408.526.5625 **************************************************************************** * The 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. * ****************************************************************************