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<p>[QUOTE=&quot;desertgem, post: 965251, member: 15199&quot;]I think it is an acrylic plastic. My associated college doesn&#039;t open the supply room for several weeks yet, but here is the experiment I would do, so maybe someone else with availability would like to try it.</p><p><br /></p><p>First I would label one air-tite right out of the package #1 with a permanent marker. Then I would take a second air tite and label it #25. This one I would assemble and disassemble 25 times ( you can always do one #100) later if you wish). Make up a solution of water and a water soluble strong ink ( I like Cyan ink jet ink for bulk refills). Fill to the top of the bottom portion of each of the 2 air tite( can flow over a little). Close securely.Dry the outside. Put each into a petri plate deeper than the air tite. Pour 2% melted agar solution ( if you are in a medical lab, you can use nutrient agar) until it covers the air tite. After the agar cools, keep covered and occasionally measure the amount of colored ring appearing around the air tite. May take a while.</p><p><br /></p><p>1. If amount of color produces the same amount of colored ring ( mm from edge of air tite) for both, ~ No difference due to # of uses.</p><p>2. If one is different than the other :&nbsp; if #25 is greater than # 1, Usage reduces the fit and allows more leakage.</p><p>&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; if #1 is greater than #25, the manufactured edge leaks more until smoothed by repeated use.</p><p><br /></p><p>3. If no leakage, you either didn&#039;t fill the capsule to the top or other error .....Or they really are quite tight.[/QUOTE]</p><p><br /></p>

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