Doug If that is the piece of string you were keeping to hang someone with, its too short! Irving, Most of our customers presently employ a go/no-go at something less than 0.2microgrammes of NaCl equivalence per cm2. The old 1.5 limit may be too high for many modern circuit designs. Remember, that old spec should be interpreted as: It is acceptable to leave UP TO 1.5mg/cm2 on your assembly surface, and that cant be a good thing. -- Regards Graham Naisbitt [log in to unmask] Concoat Limited - Engineering Reliability in Electronics A British Manufacturer www.conformalcoating.com www.concoat.co.uk www.concoatsystems.com Golf Quote of the week: I may be the only golfer never to have broken a single putter...if you donšt count the one I twisted into a loop and threw into a bush. Cell: 079 6858 2121 Office: +44 (0)1252 813706 > Irving, > In October and November 2000, I wrote two articles for IPC Review on > cleanliness requirements in IPC and military standards. The October > article was aimed at bare boards, the November article on assemblies. They > are available from the IPC, along with other articles I have written on the > subject. Jack Crawford tells me you can find those papers here: > > http://files.ipc.org/cleaning_papers.zip > > As for determining how clean YOUR assemblies need to be for YOUR > application and end use environment, that is still up to you to determine. > Both Brian Ellis and I have written on the topic (ad nauseum) and a search > through the IPC archive would be beneficial to you. > > As for the length of a string, I keep tellin' ya, it's 8.4 cm. I have it > sitting right here in front of me. > > Doug Pauls > Rockwell Collins. > > > > > Irving Lee > <Lee.Irving@INVEN To: [log in to unmask] > TEC.COM> cc: > Sent by: TechNet Subject: [TN] Ionic > contamination of PCA > <[log in to unmask]> > > > 08/31/2004 01:11 > AM > Please respond to > TechNet E-Mail > Forum; Please > respond to > Lee.Irving > > > > > > > > Does someone have any idea for the ionic contamination criteria on PCBA ? > > > Best regards > > Irving Lee > > QA,EBG Inventec > > +886-3-3900000 ext 2164 > +886-9100-79999 > [log in to unmask] > > > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 1.8e > 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 > 847-509-9700 ext.5315 > ----------------------------------------------------- > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 1.8e > 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 > 847-509-9700 ext.5315 > ----------------------------------------------------- > --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e 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 847-509-9700 ext.5315 -----------------------------------------------------