We are using Urethane coating on an assembly that uses 63/37 solder. We are using organic water soluble flux. We are Ionic testing after wash and we are well within IPC cleanliness specifications. We installed a selective coating machine and in our initial run of product we had some small bubbles that look like foam. Our customer does not like it but our stand is that it meets IPC-A-610 and J-STD-001 requirements since there in no obvious voids between conductors. They were worried about corrosion if a bubble was against a lead. The bubbles are fully encapsulated. Does anyone think this is a valid concern? Joel Alexander Quality Assurance Manager TT APSCO, INC. --------------------------------------------------- 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 -----------------------------------------------------