Fellow TechNetters; Is there anyone out there with experience with CFA cross section and chemical etchants to delineate grain boundary? Do not have the specific CFA alloy. I used the following chemical etchant: No. 5 Keller's etch HF (conc) 1.0ml HCL (conc) 1.5ml HNO3 (conc) 2.5ml H20 95.0ml Immerse for 10-20 sec; wash in stream of warm water, Microstructure of duraluminum type alloy. 17ST, AND ALCLAD Not able to se grain boundary. vic, --------------------------------------------------- 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 -----------------------------------------------------