RESPONSE from Blackstone Labs regarding this thread;
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Dan,
Thanks for the email and for the link. The % insolubles test is a great one to do because it takes into account all the different sizes of particles. What we do it fill a test tube with oil and ether (ether helps the particles to settle out). We then spin the sample in a centrifuge for several minutes, take the sample out, and dump the oil/ether mixture. What's left on the bottom of the test tube is the insolubles that the oil filter didn't catch. Theoretically, if you have a filter that filters down to ten micros, what we see should be a whole bunch of 10-micron-or-less particles. To get an idea of how big the actual particles are we'd have to do a particle count test, which we can do if you're ever interested. That tells you how many particles are less than or equal to 2, 5, 10, 15, 25, 50, and 100 microns. Hope that answers your question. If there's anything else I can do for you, don't hesitate to ask. Have great day.
Alex Miller
Blackstone Laboratories
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