At the recent IPC meeting in Tempe, AZ. on IPC 6012, Qualification and Performance Specification for Rigid Printed Boards, I asked if Para 3.11.8 b), which reads as follows, is realistic given todays thicker boards and higher aspect ratios: b) When tested as specified in IPC-TM-650, method 2.4.18.1 ambient using 50-100 micrometer (0.002-0.004 in) thick sample, the tensile strength shall be no less than 245MPa (36,000 psi) and the elongation shall be no less than 6%. The numbers appear to be directly from WS 6536 and unchanged over the years; I personally do not think a 0.125 board with 16 mil holes if it were 6% elongation would be very reliable. I also do not think anyone really would try to be at 6%. BUT I have no data so when I said why not change to a "real" number , the team members said show me the data. That leads me to ask the following; anybody have any data? Is a value of 49,000 psi and 14% , any better , or any worse, than a 42,000 psi and 22%? [log in to unmask] *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************