Paul: Using commonly available fluxes, the answer is almost certainly no, to bare aluminum. I have a strong suspicion that it would, in theory, be possible, with a proper flux, but would not have clue to advise you on where to find such a beast. Best of luck. Rudy Sedlak Paul Truit <[log in to unmask]> wrote: Can aluminum be soldered directly to an FR4 PCB using 63/37 solder paste or SN100C solder paste? Paul Truit Mfg. Eng. RBB Systems, Inc. 4265C E. Lincolnway Wooster, OH 44691 Ph. 330.567.2906 ext 514 Fax 330.263.5324 --------------------------------------------------- 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 ----------------------------------------------------- Yahoo! DSL Something to write home about. Just $16.99/mo. or less