Ken Following Brian and Lee's earlier postings, you have asked "What is the acceptable Ionic contamination limit for Omegameter 600 and Ionograph 500 both made by Alphametals?" Are you asking the right question? The existing specifications such as IPC-JSTD-001 call for a level of less than 1.5 microgrammes/centimeter squared of NaCl equivalence. However, this also means that it is acceptable to leave UP TO 1.5 microgrammes of "salt" on every square centimeter of your assembly. If you are involved with fine line, fine pitch and small chip scale packages, then this level may well be far too high. For this reason, many impose an empirical value of less than 0.2 microgrammes. The acceptable limit for either machine will be sufficient salt to kill the de-ionising filter bed - maybe also the resistivity / conductivity meter. Trying to figure how clean is clean is a tough one. My view is that it would be better / easier, to figure if your assembly is going to be reliable. You can use to modern SIR techniques to achieve this. The if you find you have a problem and want to analyse what it is causing the problem, then use Ion Chromatography. Hope this helps Regards Graham Naisbitt [log in to unmask] Web: www.concoat.co.uk Concoat Ltd Alasan House, Albany Park CAMBERLEY GU16 7PH Tel: +44 (0) 1276 691100 Fax: +44 (0) 1276 691227 -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Ken Patel Sent: Thursday, December 14, 2000 01:44 To: [log in to unmask] Subject: [TN] Ionic contamination Limit Guys, What is the acceptable Ionic contamination limit for Omegameter 600 and Inograph 500 both made by Alphametals? re, ken patel ---------------------------------------------------------------------------- ----- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------- ----- --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------