Introduction of nanometer pore size dialysis bags

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According to the test data sheet of the US spectrumlabs company (below)
 
(Figure 1)
1nm-70nm dialysis bag related manufacturers can provide dozens of dialysis bags that can not cut off molecular weight
For example, a dialysis bag of molecular laboratories (MWCO) with a molecular weight cut off (MWCO) of 100-500 daltons, having a pore size of about 1 nm;
The dialysis bag with molecular weight cut off (MWCO) 1000Kd Dalton has a pore size of about 70 nm.
Of course, because the dialysis bag membrane microstructure is not straight through the hole, but similar to the sponge (below),

(Figure II)
Therefore, there is no strict equivalence between molecular weight and pore size.
There is only a rough range of intervals.
As can be seen from Figure 1, the 10-70 nm interval is roughly equivalent to a dialysis bag with a molecular weight cutoff of 10,0000-1,000,000 Daltons (100-1000 Kd).
The following is a dialysis bag that meets the 10-70 nm (nanometer) interval.

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