I would suggest you do one of two things. 1. retest your boards for solderability as you normally do for incoming testing. If you don't know how to do this, you should ask your PCB supplier to help you or go to his place and have him demonstrate it to you and then you can go back to your factory and implement this into IQC. 2. You can return these boards to your PCB supplier and ask him to reclean them for oxide removal. He probably already has this process and it is what he will do on many of his own boards before he send them out to his customers. As part of the recleaning he should retest them for solderability for you and supply you with the test board which demostrates that it is solderable Doug From: IN%"[log in to unmask]" 15-MAR-1996 05:40:02.97 To: IN%"[log in to unmask]" CC: Subj: ASSY I have a six layer board (FR4) that has been setting on the shelf for three years, and not stored in plastic bags. What would be your recommendation to assure that these boards would solder properly, when processed? Thanks In Advance Michael Cussen Medar Inc. mcussen@medar