Madhu What temp are you baking the boards at and how do you rack them ? Also why do you do UV ? Most shops only thermal cure peelables at 150 C for 5-15 minutes You could try curing it at 140 C . On the UV .How many joules and what does temp do these boards see afri -----Original Message----- From: S.R. Madhuchandra [mailto:[log in to unmask]] Sent: Monday, October 20, 2003 2:12 AM To: [log in to unmask] Subject: [TN] Warpage after PLSM fellow technetters In some of the part numbers, we are facing a strange phenomenon The boards will be flat till the process of PLSM(peelable solder mask) but after the PLSM, there will be severe warpage & wobbling In PLSM, we are doing both UV & thermal curing Can some one throw some light on this Thanks in advance Madhu Scan by AT&S virus protection --------------------------------------------------- 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 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- 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 847-509-9700 ext.5315 -----------------------------------------------------