Thanks Rex, Your response raises the question, What happens to the No-clean Flux that is trapped between the PCB and the carrier and does not get activated? How do you clean it off or what steps do you take to de-activated the flux? Does this un activated flux lead to contamination (i.e electro migration) problems later on? Once again this is a No-clean flux. Thanks again for the response and thank you to the others who responded also. Tom Burek, CID+ Ametek/VIS From: "Rex Waygood" <[log in to unmask]> To: "TechNet E-Mail Forum" <[log in to unmask]>, "Tom Burek" <[log in to unmask]> Date: 12/15/2010 07:56 AM Subject: RE: [TN] No-Clean flux with a Wave pallet We use a No Clean VOC free flux with selective carriers. An area of concern is that this requirement demands a good preheat system. The selective carriers produce regions where liquid flux can be trapped between the pcb and the carrier. Failure to adequately preheat produces problems where the entrapped liquid flux hits the wave. We use a Miele industrial dishwasher to keep the carriers clean. The carriers are cleaned to avoid H&S issues where flux residue builds up on the carriers and comes into contact with operator's skin. The carriers just go through the machine periodically, not every time they are used. Regards Rex Rex Waygood Technical Manager Hansatech EMS provides value manufacturing through engineering and quality Hansatech EMS Limited Benson Road Nuffield Industrial Estate Poole Dorset BH17 0RY +44 (0)1202 338200 -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Tom Burek Sent: 14 December 2010 17:07 To: [log in to unmask] Subject: [TN] No-Clean flux with a Wave pallet Season Greetings All, In the opinion of all the experts out there, are there any issues I need to be aware of in using a No-Clean flux while using a wave pallet? I am trying to wave solder some through hole pins on a SMT assembly (populated 2 sides). Are there flux spray heads that can limit the flux to the exposed pins in the wave pallet? How often do the wave pallets need to be cleaned between each run? I would be most interested in any stories of disaster or success on this issue. Thank you in advance and Best wishes to all for a prosperous New Year. Tom Burek, CID+ Ametek/VIS ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- 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.aspx?Pageid=E-mail-Forums for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------