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I once tried the exact thing: to produce cork dust for our Kundts tube experiment. All experience in one word: it sucks.
Tried to process it in meat ?mincer?, in coffee grinder, everything I had at home. Best results were with sanding, but than the cork dust was contaminated with grains from sandpaper.
I was lucky enough to find a company making wine bottle corks and other cork stuff, and they gave me bag of cork dust. They were dumping it
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