Alan, Alpha 205R is what we used to use before we switched to Alpha Lonco 373 (an OA flux). We also got the white residue. Our solutions was to change the entire supply of flux in the machine. Essentially this was a complete cleaning if the fluxing system. We also used small dams on the front of the boards. These would build up a layer of white guck that was like soap stone in feel. Cleaning this white residue off the boards was almost impossible. Alcohol didn't want to touch it. Scrubbing and buffing only made the assemblers tired and frustrated. Any chance of changing some of the flux or washing system or better yet both? Phil Nutting Manufacturing Engineer Kaiser Systems, Inc. -----Original Message----- From: Alan Kreplick [mailto:[log in to unmask]] Sent: Monday, July 16, 2001 4:41 PM To: [log in to unmask] Subject: [TN] Cleaning No-Clean Hello Technet, Looking for recommendations on how to remove the white residue left from a no-clean (Alpha 205R) rework process (mini-wave rework station) on a bunch of boards, both in-house and out in the field. The boards - single-sided pth - were wave soldered using Cobar no-clean flux. The boards have several aqueous incompatible components on them, so cleaning the already built boards in an in-line or batch di-water system with or without a saponifier is not an option (maybe a consideration for new boards if the aqueous compatible parts are put on after wave). Thanks in advance for the responses, Al Kreplick Sr. Mfg. Eng. Teraydne, Inc. 500 Riverpark Drive North Reading, MA 01864 Tel: 978-370-1726 Fax: 734-661-5352 ---------------------------------------------------------------------------- ----- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------- ----- --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------