A story for all PCB fabricators, that just recently happened to a customer: This fabricator is required by their customer to run, and pass, an SIR type test, immediately after Tin stripping. When I heard this, my initial reaction was what sort of daft beaurocrat thought this one up, but, subsequently, it seems it may not be so daft. They passed the test easily, for some extended length of time, until, one day, seemingly apropos of nothing, they stopped passing it. Cleaning the boards in an alkaline cleaner seemed to help, but they could not figure out why they suddenly could not pass the test. Then they examined the bare laminate. Certain supplier(s), when the bare laminate was run through the solder stripper, could not pass the test. Others did easily. So, if this problem surfaces suddenly, the problem is likely the laminate. Best Rudy Sedlak RD Chemical Company *************************************************************************** * 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] * ***************************************************************************