There is no IPC specification requirement for storage of PWB, and lenght of storage. We have done a couple of studies about storage (IPC-TR-462) which looked at solderability over a 2 year storage condition. Essentially this study concluded, that if you had good solderabilty to begin with and solder coating, and relatively benign storage, you could solder well after 2 years. I don't know how to extrapolate this to 3-4 years, but I believe the same conclusions would hold. We have also studied the literature on steam aging of components, and have done round robin testing on this as well. Regards *************************************************** David W. Bergman, Technical Director IPC 2215 Sanders Road Northbrook, IL 60062-6135 708-509-9700 x340 Phone 708-509-9798 Fax email [log in to unmask] *************************************************** On Tue, 29 Aug 1995 [log in to unmask] wrote: > WE NEED TO KNOW IF THE IPC MANUALS SPECIFY SHELF LIFE OF > RAW PC BOARDS (AND ANY OTHER PARTS). CAN BOARDS BE > SUCCESSFULLY SOLDERED AT 3-4 YEARS OLD? ANY HELP ON THIS > WOULD BE GREATLY APPRECIATED. > > GLORIA > > >