Doug: Would air flow over the flux be an option? Air will remove the moisture faster from the flux. No matter how wet the air is the moisture in the flux will tend to evaporate since it is at a higher percentage and the air will move it away. Regards, Ramon -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas O. Pauls Sent: Friday, August 19, 2005 9:11 AM To: [log in to unmask] Subject: Re: [TN] Copper Mirror test for water-based fluxes Bev, Since the copper mirror test is there to check for the activity level of the flux, I would not want to increase that activity by the addition of heat. I would suggest pulling a low vacuum on the sample and remove the water that way. Doug Pauls Bev Christian <[log in to unmask] OM> To Sent by: TechNet [log in to unmask] <[log in to unmask]> cc Subject 08/17/2005 04:21 Re: [TN] Copper Mirror test for PM water-based fluxes Please respond to TechNet E-Mail Forum <[log in to unmask]> ; Please respond to Bev Christian <[log in to unmask] OM> Rudy and others, The copper mirror test is a simple look-and-see test that can be used as part of the qualification of a flux, solder paste, or any other chemical that may come in contact with a printed circuit board or printed circuit pack. See IPC-TM-650, Test Method 2.3.32D. Essentially a flux or material is dissolved in IPA (or at least sort of), applied to a vapour deposited copper mirror, the solvent is allowed to evaporate and then the mirror is stored at RT and 50%RH for 24 hours and then you wash off the material and see whether it has eaten through the thin copper mirror coating. Now if you are using water as the solvent, the vapour pressure is much lower. I can't remember what I used to do when I did this test at Nortel in the late 90's when we started to use the water-based wave solder fluxes. Bev RIM _____ From: R Sedlak [mailto:[log in to unmask]] Sent: August 17, 2005 3:41 PM To: TechNet E-Mail Forum; Bev Christian Subject: Re: [TN] Copper Mirror test for water-based fluxes For those of us who only recently realized that something had to happen to a PCB before it was installed..(Assembly? What's that?)... be so kind as to tell us more about this test, and what it is supposed to tell you... and how to read it.... Any help is appreciated...(and needed) Rudy Sedlak RD Chemical Company Bev Christian <[log in to unmask]> wrote: It is such a long time that I have done one of these, that I don't remember what we did to evaporate the water! The alcohol based ones are easy, but the water ones?! Do you just let them set at room temperature or do you give them a little heat or what? 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