The only way to be completely confident the rework corrected the original problem is to perform the rework bake, then 100% cross-section the boards to inspect for delamination. Perhaps you can ask the supplier to perform this test? Jana Carraway MSEI - Advanced Technology Group 6024 S.W. Jean Road Lake Oswego, OR 97035 503.697.5291, ext 1180 email: [log in to unmask] -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Mumtaz Bora Sent: Thursday, September 15, 2005 6:21 PM To: [log in to unmask] Subject: [TN] Rework for Delaminated PWBs Dear Technetters, We have received a large batch of PWBs that is showing delamination after reflow at peak temp. 230C. Laminate is high Tg - 170C. Supplier is proposing to perform the following rework -- on these boards instead of providing replacement parts. Oven bake at 190C for 2.5 hours followed by second bake at 150C for 2 hours at 6kg/cm2 pressure. Will this guarantee a full cure? I am concerned about latent failures and layers opening up as full cure was not achieved the first time. Any inputs from the forum will be appreciated. I will request Steven Gregory to place the image of delamination on his website. Have a great weekend. Thank-you Mumtaz D/ 252 - SMT Process and Component Quality Bldg. V238E Voice (858)-882-1967 Fax (858)-882-3126 Page (858)-635-1180 Cell: (858) -449-7054 email: [log in to unmask] Kyocera-Wireless Corp. 10300, Campus Point Drive --------------------------------------------------- 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 ----------------------------------------------------- San Diego, Ca 92121,USA --------------------------------------------------- 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 -----------------------------------------------------