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[AspenLeif]

I tried several times to do this on the greenboard...no one wanted to contribute that data points I needed. One of my degrees focuses on material science and engineering and with a lot of people asking about it...a couple years ago I came up with like a 3 page calculation for finding out ppm O2 permeability of brewing in different plastics. I've also had this information confirmed by a material science professor and I spoke at length with a scientist at AB to confirm this too. If I get most or all of the data points below...I can put together a sheet that pretty much will give insight on a lot questions that continuously get asked.1) Vessel shape/type of plastic and brief description. Since surface area is part of this equation, I need to know if it has ribs, molded in handle, strange contours, etc.2) OFC - overflow volume of the container (not advertized volume). Most accurate way to do this is in grams....weigh empty and then full. +/- 100g is close enough. If you have to do volumetric measuring, try to be within 1 cup of water.3) Dry weight of the vessel. Include the lid, but remove any metal fittings or any other non functional items. Need as accurate as you can get +/- 10g or so.4) Average wall thickness. This one is not completely necessary since I can calculate from #2 and #3, but good to have a double check. Best way to do it is a magna-mic, but you can also do this if you have a set of micrometers or calipers. Remember that using mircometers will be tricky to measure a curved surface. 5) physical dimensions of the vessel. Diameter, total height, height from the base the 'shoulder', etc. If it is tapered, I need to know how much. Plus any additional info relevant to figuring surface area.Let me know if you want to help.MB