Hi Phil! Boy, you sure are "picky" (I'm just teasing), maybe my statement about "pulling moisture" was incorrect...in fact, I know it was. It's exactly as you state. What McDry cabinents do is "De-absorb" moisture...pull, de-absorb, I guess it's all terminology... I just know that the digital relative humidity indicators inside the cabinents read 4% humidity almost all the time, and I recieved calibration documentation from Seika that traced the meters to the ones that I have...so they're accurate. If you open the doors, of course the humidity level goes up. If you can keep the doors open less than a minute, it'll recover back down to the original level in about a hour or so....they say 30-minutes, but it does take a bit longer than that...it all depends on your ambient conditions. There are those of us that don't have a nitrogen cryogenic pad where we have unlimited nitrogen...much less the piping that is required to plumb nitrogen to the places that we would need it. This cabinent is great in my opinion, there are a lot of positive things about these cabinents that is explained on McDry's web page, they have have charts and everything, I think that these are results from tests that they have done...why would I want to go back and re-do these tests to prove them wrong? I think they make a good product for those of us that don't have the resource of unlimited nitrogen....I also think that there are certain aspects about their cabinents that out-perform a dry nitrogen cabinent... -Steve Gregory- << hi, I've got a problem with the statement that the desiccant 'pulls' moisture out of the component...something that nitrogen can't do because it is a gas that water isn't soluble in (see mcdry). somebody help me with that one. as i see it, desiccant in the cabinet pulls moisture out of air in the cabinet. the moisture in the air in the cabinet gets there from the component that has moisture in it. The initial drying force is that of moisture in the component migrating to dry air which then gets transferred to the desiccant because of it's affinity with the desiccant (up to a point). now, replacing the dessicant-air combo with a continuous flow of desiccated nitrogen should give you the same result. it seems to me the argument in favor of the mcdry is that it's more convenient than dry nitrogen. with the cost of electricity sky rocketing (at least here in California) mcdry may not be less expensive (this is just a guess). phil >> --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------