Nicholas, It is Residual Organic Solvent Extraction testing. Otherwise known as SEC Solvent Extraction Conductivity or IONIC EXTRACT CLEANLINESS testing. I am sure you will be familiar with this test method but please bear in mind that it will only identify ionic residues that may be harmful but not any non-ionic residues which may also be harmful. Furthermore, it is of questionable use if you are operating a no-clean process because many fluxes should not be cleaned and this test method does exactly that. The method used may also impart different "cleanliness" values and you need to apply the equivalency factor for the system used. Also, high pressure spray systems, such as our ICOM series, provide superior extraction to those relying on immersion. You may also consider that the "cleanliness" value, presently recommended at less than 1.5 microgrammes of sodium chloride equivalence, also means that it is acceptable to leave UP TO that amount on every square centimeter of your assembly! If you manufacture fine pitch, BGA, COB and other "exotic" chip scale packaging, then this value will almost certainly prove too high. For the above reasons, Surface Insulation Resistance (SIR) testing is becoming far more relevant and if you would like some further info on that - because guess what; we do those too - then let me know. Sorry to give you such an extended reply, but the Americans are on holiday - for some reason, we British aren't too sure why! - and my e-mail cupboard was not very full. Graham Naisbitt Concoat Ltd Email: [log in to unmask] Alasan House, Albany Park Tel: +44 (0)1276 691100 Camberley, Surrey GU15 2PL UK Fax: +44 (0)1276 691227 -----Original Message----- From: TechNet On Behalf Of Nicholas Kane Sent: Monday, November 17, 1997 10:55 AM To: [log in to unmask] Subject: Re: [TN] Do we really need ionic contamination measurement equipment? Please, can you tell me what ROSE is? Thankyou At 09:53 15/11/97 UT, you wrote: >Ken, > >Your wash system is tracking the resistivity or conductivity of your rinse >water and your filter plant is taking care of such contaminants that are >entering the process. > >The question is how much contamination is on the assembly, and has it all been >removed? I doubt that you can accurately maintain the amount of contamination >that is being applied to your assembly both in your process and that of your >PC Fab shop. > >It is therefore a good idea to conduct regular ROSE tests to ensure that your >process is always under control. The sampling rate to achieve that is another >subject that should be addressed. > >Graham Naisbitt>--------------------------------------------------------------------- ------ > Nicholas Kane Axion Australasia Suite 3, 651 Canterbury Road Surrey Hills Victoria 3127 Australia ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ############################################################## ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ##############################################################