I would be concerned about the possibility of contamination into the resin with etching solutions, which may stain and change properties etc which will then be bonded onto a sub-assembly If your talking about a single stage "B" stage with around 50-80uM of resin, there may be handling issues, as the material is not as "solid" and flexible as it would be after the change in rheology excursion through the press. A 2 stage "B" and "C" may be more suitable for handling, but the same concern refers as above to the "B" stage. Colin McVean Production Manager Artetch Circuits Limited Tel: 01903 725365 -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of James W. High Sent: 05 April 2005 16:35 To: [log in to unmask] Subject: [TN] Etching resin coated copper (RCC) RCC is a copper foil coated with B-staged epoxy resin. Is it possible to etch a pattern in the copper while the epoxy is still in the B-stage? In other words, will the chemical etchant attack the as yet not fully cured epoxy? If anyone has actual experience doing this, please let me know. Thank you, James High --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------