Hi, I assume that by using so much flux for handsoldering, there will be visible residues afterwards. If this is the case, then what's the point of using no-clean flux ? Using a good old RMA flux may be a better choice, with better wetting properties and less corrosion risks as the acitivators (if there's something left after soldering) are safely embedded within an insulating colophony layer. Another suggestion is to look in the datasheets of the flux you're using, and check if the unheated material is qualified to be left on the board. The datasheet should be backed up by a detailed testreport. But be aware that there's still a risk that the results on your boards are worse than on the testsamples that were used by the flux manufacturer. Daan Terstegge Thales Communications Unclassified mail Personal Website: http://www.smtinfo.net >>> [log in to unmask] 04/10/03 11:07pm >>> Hello Technetters! I often observe rework/touchup operators drenching the area of a PCB they are soldering with no clean flux. When the flux spreads to an area not heated by the soldering iron or washed away, what long term effect will this have? Will it affect only certain designs or would this be a problem for most? TIA for your help! --------------------------------------------------- Technet Mail List provided as a free 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/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 1.8e 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------