In my experience the current IPC test used by laminators to check dimensional stability has no correlation to dimensional stability results after multilayer lamination at a PCB shop. Is IPC investigating a different test method or does any PCB shop have there own "dimensional check" for incoming laminate. I'm working on this issue at our facility and I'd like to swap ideas with other PCB shops. Thanks in advance for any response. Paul Formiller Process Engineer - Merix Loveland [log in to unmask] phone (970)-203-6663 pager (970)-593-5562 fax (970)-203-6751 Paul, I have run into the same problem. We have developed a test that compares to the IPC method, but is more relevant for a PCB shop. In general, we do something like the IPC test but on a larger scale, continuing the test piece through a relamination step. The problem is that it probably isn't useful for an incoming laminate check, since it takes longer to complete and you most likely don't want to sit on an inventory of laminate waiting for results. Therefore, this is best used as a dimensional stability test vehicle or a process control tool. However, we are working on a procedure like this that can be completed quickly. If you would like to talk more about this I can be reached at: Ed Kelley Senior Engineer Hadco Corporation Phone (607) 687-3425 Fax (607) 687-7457 E-Mail [log in to unmask] or [log in to unmask]