Good Morning Technetters - IPC-RB-276 Paragraph 3.9.2.7 states that vias shall have 60% resin fill. I understand the European community uses a higher number near 100% fill. My engineering group has asked me the below questions and I have no words of wisdom. So I forward the questions to you folks. Where did the 60% value originate from? What reliability studies confirm the 60% value is valid? Thanks for your help, Randy Reed Merix Corporation 503.359.9300 [log in to unmask]