Others have answered the "how do you know how clean it is" question and the list below is good, but for completeness of explanation: still consider flux chemistry and [metal] finishes. If you leave an active water soluble chemical on your work it can continue to react. Reaction products could have different solubilities, so what you are trying to remove after a delay may not be what you were trying to remove immediately. You could additionally have cosmetic effects which are unacceptable. Visit us at Productronica, Stand A4.163 www.indium.com/productronica Regards Mike Fenner Indium Corporation -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting Sent: Monday, October 29, 2007 8:12 PM To: [log in to unmask] Subject: Re: [TN] cleaning concerns Dewey, This dovetails into what I'm looking into. So if I state a required level of cleanliness, what equipment do I have to buy to prove it? I know "it depends" so it should be tailored to what is simple yet effective. Mercedes or BMW type equipment is out of range. I'm thinking something just above the diesel Chevette level. Phil -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey (EHCOE) Sent: Monday, October 29, 2007 1:26 PM To: [log in to unmask] Subject: Re: [TN] cleaning concerns That's a week answer. The real answer will cost me another royalty donation to the Doug Paul's Defense Fund for Battered Chickens, but it depends. The range of time could be from ASAP (a maximum one hour) to eternity (meaning never). Some of the things to consider are as follows: * Laminate * Final surface finish * Solder Mask * Spacing * Component orientation * Assembly surface topography * Material compatibilities * Cleaning chemistries * Solvency capabilities * Flux chemistries * Cleaning process residuals and their chemical make-up * Thermal excursion exposures during processing * Cleanliness requirements * Conformal coating or not * Testing requirements * End use environment * Warranty issues * Cost Dewey -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Linda Langley Sent: Tuesday, October 23, 2007 11:40 AM To: [log in to unmask] Subject: [TN] cleaning concerns Can anyone tell me or direct me to documentation that specify how long flux residue from WS609 63/37 can be left on a board before washing? I was informed that it could be left on for 7 days . 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