I have two minor questions for those of you with more experience. 1) I have been carrying my layers around standing on edge in racks, which is causing some handling damage as I go to larger panels. I am considering laying them flat between processes, but I think I need something to interleave the layers. It should be cleanroom compatible and durable and shouldn't contaminate the material. I looked at regular cleanroom paper, but the stuff we use has an oil base. Tyvek looks promising, but pricy. Does anyone out there interleave like this? What do you use? 2) We've just set up a 100K cleanroom to perform all of our photoprocessing in. We did it because that's what 'everybody' said is the best way to reduce contamination and improve yield. My question is; what impact does exceeding the 100K particle count have on parts? Is it just a yield reduction that will show up on my AOI? If I find that I've processed out of tolerance, should I track down the affected parts and pitch them or should I just monitor for increased scrap? I know there is no such thing as a stupid question, but I'm working on it. Bob Hunt Boeing Electonics Manufacturing Engineering (206) 773-8670