Hi Michael, In my experience it is not needed to re-bake PCB's after cleaning. Even when you soak a PCB in a bucket filled with water, it takes hours until the board has absorbed enough moisture to result in delamination-problems. This may not be true for polyimide or other sensitive materials, but for standard FR4 I wouldn't worry. Kind regards, Daan Terstegge SMT Centre Thales Communications Unclassified mail Personal Website: http://www.smtinfo.net >>> Michael Bell <[log in to unmask]> 10/03 9:49 pm >>> What is the impact on a PCB if an operator has ultrasonically clean a PCB in IPA. The PCB was cleaned for about 5minutes after the paste had been scrapped off. Would the PCB absorb the IPA and in-turn lead to delamination or have any other degrading effect? --------------------------------------------------------------------------------- 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 To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL 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 To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL 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 ---------------------------------------------------------------------------------