As a worthy member of this panel might say, "it depends". On what does it depend? - the desired reliability of your end-product under what conditions - the quality of your incoming water and the nature of the impurities - the type of cleaning machine - the type of drying machine - tolerance of physical aspect - whether you are obliged to recycle water - whether you wish to conformally coat - whether you are able to conform to waste water regulations - etc. Put it this way: I have, in my heyday, installed literally hundreds of water cleaning systems. I can think of only two where they were able to dispense with deionisation for telecomms exchange systems. These were characterised by: - very soft water with low TDS - mechanical removal of the last rinse water (not evaporative drying) - very tight process control throughout - no conformal coating As you are in the UK and you have a Scottish name, let me make a guess that may be in Scotland. If your water comes from a peat area (e.g., Loch Katrine, Western Highlands or the Pentlands), with a low pH and it is not adulterated by too much additives, you may be lucky and get away with it BUT - and this is important - you must qualify your process to make sure you can. I wonder whether it's worth the risk, though. Brian Richard Strathie wrote: > We have been asked to look at replacing our water wash cycle in our lead free > assembly process with a de-ionised wash. > I thought de-ionised wash had become redundant with water soluable fluges. > Deos anyone have any recomendations ? > > Regards > Richard > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 15.0 > To unsubscribe, send a message to [log in to unmask] with following text in > the BODY (NOT the subject field): SIGNOFF Technet > To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) > To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest > Search the archives of previous posts at: http://listserv.ipc.org/archives > Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 > ----------------------------------------------------- > --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------