Rob, What exactly is the customer's beef? Are they expecting to see a completely uniform film everywhere across the board? I don't really see anything wrong with the coating job. What you may be seeing is residual material in the holes that can weep out. Do you blow out the holes with compressed air after batch cleaning? Do you bake the boards after cleaning? Doug Pauls Rob Strecker <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 03/22/2010 02:46 PM Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to Rob Strecker <[log in to unmask]> To [log in to unmask] cc Subject [TN] Conformal Coating Issue? Hi all, We have an issues with one of our customers that we build PCA's for. After we complete the build the customer sends it out for conformal coating. It appears the coating or florecent does not like via holes. I believe they are still getting good coverage and I don't think this is a dewetting problem as there is still coating present in the darker locations. I don't see these boards after they get coating but that's what I am tolled. These boards are double sided, lead free using water soluble paste/flux washed in a batch cleaner with a 6% chemical concentration. We go through many rinse cycles and clean to 1.4Meg (resistivity monitoring of the rinse water, for what it's worth). What might the casue of this be?... wash solution in the vias?? Below is a link to the picture. http://ipc-technet.groupsite.com/galleries/photo/117131 Rob ______________________________________________________________________ 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 15.0 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 Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 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 15.0 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 Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------