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Here is a link where the issue of mesh vis a vis thread size, count, and micron opening is discussed, along with charts.
https://skunkpharmresearch.com/diy-sieving-frames/
I think there is a slight confussion there.
the page you sent speaks both of microns (SI unit measure equal to a millionth of a meter or a 1000th of a millimeter.
and that part follows what my previous picture shown (the smaller the number, the smaller the hole.)
then it goes on explaining that some mesh is sold not on pore/hole size but in count of threads, and explains that the more the thread number, the smaller the hole.
So to resume from your article.
if you know the pore/hole size it goes the smaller the number, the smaller the hole.
if you only know the thread count of the mesh, then the bigger the thread count number, the smaller is the hole...
Which is logic, the more thread there is, the less space between threads.
In his example, he aims for 75microns, 110microns and 130microns
so he should use according to his own table a: 200 a 140 and a 120 THREAD COUNT mesh...
hope it helps clearing the confusion, i didn't see the word thread count in your post (the one i quoted).
it will be a nice addition to the forum if we could have tables comparing the microns against the thread count and the xXX numbering for silk, also for quantitative or qualitative paper filters there is a different nomenclature according to size and grade (actualpore size) all this can be very confusing for your average Jesse Pinkman, unless he's got his Walter nearby :D
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