We do not reflow lead-free here but if you are using no-clean I suppose there is a remote possibility that some lead contaminated flux could some how get onto a board. If you clean after reflow you should be getting everything off the board. On a more personal note; if we are worried about that amount of lead contaminating our planet then I think we've gone way beyond what even the EU Politicians had envisioned. Heaven help me if my grandchild eats a circuit card from his cell phone that I reflowed that has a nano-spec of residual flux that may have once upon it's life evaporated from an 0402 solder joint containing that most deadliest substance in the amount of 37% lead, oh horrors! KennyB -----Original Message----- From: Joe Macko [mailto:[log in to unmask]] Sent: Thursday, April 03, 2008 12:34 PM To: [log in to unmask] Subject: [TN] use of the same reflow oven for Pb-free and Sn Pb reflow Folks, Question - I believe that it is common practice to use the same forced convection reflow oven to reflow Pb-free as well as SnPb boards in today's world but I was wondering if anyone has experienced any issues doing this as well as what safeguards should be implemented so Pb-free flux residue deposited within an oven does not contaminate SnPb boards (e.g. flux build-up in the oven could redeposit onto boards going through the oven?). thanks again. Best regards, -Joe --------------------------------------------------- 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 -----------------------------------------------------