Bellcore has SIR testing requirements for inner layer processing which is done on comb patterns which are to represent the process and are tested monthly, weekly or less depending upon the "baby bell" the board shop is dealing with in contracts. We do this type testing for several people. It not only involves inner layers, but each combination of soldermask/surface finish as well as cleanliness prior to solder mask application. This is detailed in the TSY 78 type spec Susan Mansilla Robisan Laboratory *************************************************************************** * 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] * ***************************************************************************