A couple of reasons come to my mind. Moving (pushing) water off a board takes much less energy than evaporating it with heated air. Also, evaporation leaves behind any contamination that may have found its way into the water. From a practical perspective though, I don't see how water could be effectively pushed off a board (and from under components) in a batch system. That is one reason why we chose an inline system with a very effective blower section. Our tests have shown we can push the water out from under components that have just .002" standoff heights. We don't even have to heat the air. The friction of the moving air raises its temperature to about 114 degrees F in our system. ========================= Bob Barr Manufacturing Engineering Formation, Inc. Voice: 856-234-5020 x3035 Fax: 856-234-6679 ========================= -----Original Message----- From: Phil Nutting [mailto:[log in to unmask]] Sent: Wednesday, July 10, 2002 7:19 AM To: [log in to unmask] Subject: Re: [TN] Water soluble batch washers... Rudy, Why do you suggest to eliminate the heated dry cycle and replace with an air blow-off? We have one of the expensive "dishwashers" and the heated dry cycle works very well. My personal opinion is that the blow-off leaves quite a bit of moisture under components. Phil Nutting -----Original Message----- From: Rudy Sedlak [mailto:[log in to unmask]] Sent: Wednesday, July 10, 2002 1:34 AM To: [log in to unmask] Subject: Re: [TN] Water soluble batch washers... Steve: I have seen it done successfully.... We even went so far as to formulate a version of "Cascade", with some more inhibitors that would be useful on Tin/Lead etc, and omitted the chlorine, which is NOT helpful. Suggest you eliminate the heated dry, and use an air gun. (hair dryer?) Leave it to Steve to punch holes in a wonderful myth... We need more people like you who call it like you see it... Rudy Sedlak RD Chemical Company