for a PCB with vias/thru holes try 140 F with 95% RH for 96 hrs. then reflow 3 cycles wave solder take a look at flow up thru holes/vias some believe this represents 8 months of shelf life approx. (from a Mike Carano IPC workshop) - thanks Mike! Mike Weekes -----Original Message----- From: Peter Hefti [mailto:[log in to unmask]] Sent: Thursday, April 25, 2002 2:30 AM To: [log in to unmask] Subject: [TN] Accelerated test for simulation of storage of PCBs with surface finish white tin Hello TechNet: We are searching for a method of accelerated aging of PCBs with surface finish in white tin (chemical tin). This method should be recognized , in order to simulate the storage of 6 or 12 month under normal conditions. (85/85/1d or 2d test ??) After such an accelerated test, the solderability will be tested by the wetting balance method. Thank you for your answer With best regards Peter Hefti