Hi All! My turn to post a picture today...hehehe. Have this very strange problem with my good ol' freind dry film soldermask...eh, what's new? Take a look at; "Mask Blisters, and Mask Blisters 2" on my page at: http://www.stevezeva.homestead.com These are very little tiny blisters on the backside of a built assembly. The board was baked and it was wave soldered. The blisters don't appear on the topside of the board at all. The soldermask is Dupont Vacrel 8140. The little blisters appear everywhere there's been touch-up done. It's not just around the solder joints, but it looks like the blisters appear where ever flux has contacted the mask. The liquid flux that we use for touch-up is Alpha 615 RMA. What in the world could cause this sort of thing? Kind regards, -Steve Gregory- Senior Process Engineer LaBarge Incorporated Tulsa, Oklahoma (918) 459-2285 (918) 459-2350 FAX __________________________________________________________________ This message may contain information that is privileged and confidential to LaBarge, Inc. It is for use only by the individual or entity named above. If you are not the intended recipient, you may not copy, use or deliver this message to anyone. In such event, you should destroy the message and kindly notify the sender by reply e-mail. --------------------------------------------------- Technet Mail List provided as a 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------