Doug, Better late than never. Listed below are the answers to the questions. Thanks much. MJ -----Original Message----- From: [log in to unmask] [mailto:[log in to unmask]] Sent: Thursday, February 28, 2002 5:38 PM To: [log in to unmask]; [log in to unmask] Subject: Re: [TN] FW: Water soluble w/BGA Mary Jane wisely asks: I wanted to present this question out to the experts; What do you think about the validity of using water soluble flux with BGAs? Do you see a "residue" issue? Thanks. Doug Pauls, now way overdosed on Dew, replies: Maaaaaaaaaaaaaaayyyyyyyyyyybe. What water soluble flux? Alpha 609 paste What reflow method? Vapor phase, IR reflow, laser, hot gas? Air convection reflow What cleaning process? DI water Adding anything to the water? No In-line or batch cleaning? Both Itty bitty BGAs or big-honkin' BGAs?? Everything under the sun Full array or perimeter array? Same as above What standoffs? Same as above Are your boards clean going into it? Yes What do you mean by residue? Any contaminant What end use environment? It doesn't matter What reliability requirements? It doesn't matter What is the service life of the product? As long as it keeps on ticking What are the consequences of failure? Customer dissatisfaction Are you underfilling the BGA? No Why does the other line always move faster? Because the other line took their vitamins Is giving a year's supply of Captain Crunch cereal to my nieces a fitting revenge on my sister? Only if your sister embarrassed you when you were growing up. I should probably stop now. Too much Dew. Definitely too much Dew!!