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I'm packing fused silica emitters with 5 micron beads. http://www.newobjective.com/images/products/columns/pfc_biphasic.gif And holy crap it takes a long time. I tried some with a 150 micron internal diameter last week and those were no sweat. Then 50 microns, and that took hours to get less-than-desired amounts of packing. Today I'm packing 25 micron internal diameter capillaries. I can barely even see if it's working, and I might be doing this all day.