Hi Rigo - yes, Doug would give you the standard " it depends" response because as you detailed,there are too many inputs to your question. The reason that the IPC-1601 committee only put suggested values in the standard is that clear, data determined, industry wide applicable values for requirements could not be established. The committee is continuing to investigate, research and gather published data on that task. Establishing industry wide applicable values is a difficult task as the committee does not want to impose any requirements that are not based on data and are not value added for the industry. Dave Hillman Rockwell Collins [log in to unmask] "Garcia, Rigo (GSFC-300.0)[MANTECH SRS TECHNOLOGIES]" <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 10/21/2011 01:31 PM Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to "Garcia, Rigo (GSFC-300.0)[MANTECH SRS TECHNOLOGIES]" <[log in to unmask]> To <[log in to unmask]> cc Subject [TN] How do we determine the Maximum Acceptable Moisture Content (MAMC) for a board? Hi everybody, Does anybody know how do we determine the Maximum Acceptable Moisture Content (MAMC) for a board? I understand that IPC-1601 states that for most designs a MAMC between 0.1% and 0.5% of moisture weight to resin weight is adequate. However, it does not describe the basis to establish the range. I can think of many variables that can affect this number like minimum pitch, voltage across, component clearance, whether the board gets conformal coating or not, etc. I would like to know if anybody knows of a safe method to determine the MAMC for a given board. Paul... I can already see your "it depends" coming... :)! Thanks for the help! Rigo Garcia Sr. Quality Assurance Engineer Workmanship Standards, Code 300 NASA, Goddard Space Flight Center Greenbelt, MD 20771 Phone. (301) 286-6129 Fax. (301) 286-6576 ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 16.0 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 For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 16.0 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 For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------