Hi Ode, Thanks for the clarification on washing boards with distilled water. My friend was working for Celestica at the time (about 10 years ago) and he was dealing with the assembly of Sun and Cisco boards, which I presume are all surface mount. He definitely said that distilled water was corrosive for their purposes but maybe there's more to the story.
Maybe the amount of solubility of metals is very low but there's a definite metallic taste when distilled water sits in metal pots. I've tried both magnetic and non-magnetic stainless steel so it may not be nickel that's the issue. However I am chemically sensitive so this may not be something that most people notice. I should clarify that adding salt just mitigates the reaction enough that I could drink a half cup of reheated water but it doesn't eliminate the reaction totally. Heating up food in the same metal pots with added distilled water doesn't pose anywhere near as much a problem, so this is why I believe it relates to the reactivity of water. I read somewhere that the metallic taste imparted to water is one reason why some tea drinkers use borosilicate glass kettles and strainers. I haven't had the opportunity to test that myself. Jay On Tue, Mar 16, 2010 at 11:48 AM, Ode Coyote <[email protected]> wrote: > > > Distilled water is used to wash the tap water water off boards which washed > off the water soluble flux used because it doesn't leave mineral water spots > behind when it evaporates. > It doesn't stay on there long enough to corrode anything. > You most certainly don't want salt crystals left behind on the PCB because > salt absorbs water out of the air, is conductive and will electrolytically > make hash out of the circuits when run, very quickly. [Not to mention a lot > of cross talk between high impedence chip and transistor inputs ] > > The toxic flux removers like carbon tetrachloride are for petroleum based > salamoniac rosin core fluxes which haven't been used since the advent of the > flow solder machine...except for the hand assembled parts that won't stand > the heat. > Plain old Coleman stove fuel works pretty good [Naptha] or a shot of carb > cleaner. > > Now, with robot assembled surface mount tech, the flux only goes where it's > needed and the boards aren't washed as there is no excess to wash. > > I've manufactured many thousands of PCBs since 1970 in all the stages and > still spend many hours a day populating them...old through hole tech and > completing new robotic surface mount. > > The makers of stainless pots say DON'T leave salt water in a pot as that > will pit the surface. > Distilled water only sucks up soluble minerals and metallic nickel ain't one > of them. > > Ode > > > > At 08:01 PM 3/15/2010 -0400, you wrote: >> >> I will react to distilled water that is heated in any metal container >> or sits in it too long, unless something is mixed in. A few grains of >> sea salt is enough to stop this from happening. >> >> Pure distilled water is fairly corrosive to metals. A friend who used >> to work in process engineering at one of the biggest circuit board >> assembly companies told me that distilled water is sometimes used to >> wash the boards after assembly but it is less desirable than other >> (toxic) solvents because of its corrosive nature. >> >> I don't have problems if the distilled water is stored in glass or >> certain hard plastics. Anything that has a silicon gasket causes me >> problems, even if it isn't immersed in the water. However this only >> applies to storing water after distillation, not during/before because >> my distiller does have a silicon gasket in the chamber, and I don't >> react to it. >> >> Jay >> >> On Mon, Mar 15, 2010 at 7:00 PM, sol <[email protected]> wrote: >> > Harvey Metzler wrote: >> >> >> >> Sol: >> >> >> >> Distillation is distillation. >> > >> > Harvey, >> > Yeah, I know. I'm just super worried about it, because I have such >> > severe >> > reactions.- >> >> >> >> Stainless, nickel etc will stay behind in the bottom of the still just >> >> like calcium or whatever. >> >> >> >> Your super expensive very large industrial stills that make the purist >> >> of >> >> the pure are stainless steel boilers because you cannot get heat to >> >> transfer >> >> in glass. >> >> >> >> You also do not see glass bottomed rice cookers or same reason. >> >> >> >> Run your water out of stainless and let it drip through triple coffee >> >> filters loaded with activated charcoal and you get very good water. >> >> >> >> You are worrying about body contamination so far down in the mud that >> >> every morsel of food you buy and put in your mouth and the air you >> >> breathe >> >> is far more contaminated. >> > >> > Though the water from my distiller never bothered me, so far as I know, >> > when I got rid of ALL the non-magnetic SS I had been using, from >> > cooking >> > pots to collander to table ware I gradually lost about half of my >> > reactivity >> > to other substances I get hives and eczema from. Food and air I can't >> > do >> > anything about, and probably the distiller is as you say, a non-issue as >> > the >> > water from mine came out so very pure, and SS cookware is a different >> > issue >> > from a distiller, but............if nickel did leach from the still >> > boiling >> > chamber or from the coil, would it be in a form that is conductive? I >> > suppose it would, but don't have enough real knowledge to be certain of >> > it. >> > I know I didn't want a SS coil, my old still had aluminum coil, and I >> > was >> > fine with that, and please everyone lets don't start another >> > interminable >> > thread on the dangers of aluminum...........been there, done that, don't >> > care. >> > sol >> > >> > >> > -- >> > The Silver List is a moderated forum for discussing Colloidal Silver. >> > Rules and Instructions: http://www.silverlist.org >> > >> > Unsubscribe: >> > <mailto:[email protected]?subject=unsubscribe> >> > Archives: >> > http://www.mail-archive.com/[email protected]/maillist.html >> > >> > Off-Topic discussions: <mailto:[email protected]> >> > List Owner: Mike Devour <mailto:[email protected]> >> > >> > >> > > >
