David The only way to remove gold chemically is using nitrohydrochloric acid or aqua regia which consists of three parts concentrated hydrochloric acid an one part nitric acid. However, I don't know how the ceramic body of your components will like this treatment. Best regards Guenter _____________________________________________________ EMPA Swiss Federal Laboratories for Materials Testing and Research Centre for Reliability Guenter Grossmann, Senior Engineer 8600 Duebendorf Switzerland Phone: xx41 44 823 4279 Fax : xx41 44 823 4054 mail: [log in to unmask] _____________________________________________________ >>> David Tremmel <[log in to unmask]> 06/27/08 9:42 pm >>> Hello, We have some ceramic LGAs which need the gold pads to be cleaned, probably using an acid. If anyone has performed this kind of work before and could recommend which acid and some procedural help I would greatly appreciate it. Thank you in advance for any suggestions and have a nice weekend. Thank you, David Tremmel Value Recovery 847 858-5540 - Cell 847 557-9574 - Office 847 557-9573 - Fax <http://valurecovery.com/> http://ValuRecovery.com --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------