Bob, I do not agree with your tap water analysis as you are comparing apples to duck billed platypuses. That 10 micogram figure you quote is a completely different animal. That is 10 micrograms of sodium chloride equivalence per square inch of extracted surface. What this means is that it takes that much sodium chloride to reduce the resistivity of a deionized water / isopropanol solution from 6 megohm-cm to 2 megohm-cm. It has absolutely nothing to do with the actual amount of sodium or chloride on the assembly itself. It does not relate in any way to the conductivity or hardness of the cleaning media. I am glad your Water Pik works well for you. You are obviously thorough in your rinsing and understand the consequences if you don't. If it was me, though, I would use deionized or distilled water rather than tap water. I spent 8 years at CSL troubleshooting manufacturing processes, many of them based on water soluble fluxes, and found that tap water is a poor cleaner, hence my comments. I did studies of the water purity around the US and around the world as part of that work. It varies tremendously. Doug Pauls Rockwell Collins Robert Kondner <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 09/08/2010 04:32 PM Please respond to [log in to unmask] To [log in to unmask] cc Subject Re: [TN] Hand Soldering Bob, Try a "Water Pick" from a drug store, I got one at Walmart. I use it after rework of a small part, it really blasts water under parts. I fill the container with hot water and blast under small SMT parts. For complete board wash I use a spray assembly like found on a kitchen sink. This is ok for protos but a real washing system would be suggested for production. It takes a long, good, hot spray to get under BGAs. For QFNs forget it, you can not clean under those parts. Cleaning solutions are a big help. Also: I did not see any comments on my analyses of using tap water. Even with 500mg / L dissolved solids tap water it takes a good number of small drops to push towards the 10ug/insq limit. A 1mm drop (1/2 sphere) per 1 inch sq is only .25 ug/insq. It would take 40 drops per inch square and THAT is a lot of tap water. A quick blow off with an air gun leaves much less. Bob Kondner -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Bob Landman Sent: Wednesday, September 08, 2010 5:18 PM To: [log in to unmask] Subject: Re: [TN] Hand Soldering We switched to water-soluble Kester brand and are very satisfied with it. Hot water and a good brush (we use a dish washing brush). Bob Landman H&L Instruments. LLC On Sep 6, 2010, at 6:30 AM, Kenneth Wood wrote: > Hi all. > What is the best setup for hand soldering as far as solder / cleaner? > Rosin core? Water soluble? No-Clean? > What cleaner too? > > I've been using rosin core with various cleaners but I have a hard time with > the white residue the cleaners leave. > > Thanks > Ken > > > > > > ______________________________________________________________________ > 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.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 > ----------------------------------------------------- > ______________________________________________________________________ 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.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- ______________________________________________________________________ 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.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- ______________________________________________________________________ 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.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------