100PCS PTFE Hydrophilic/Hydrophobicity Membrane Filters Round Mixed Cellulose Esters Filter Paper 13/25/50mmDiameter 0.22/0.45um

100PCS PTFE Hydrophilic/Hydrophobicity Membrane Filters Round Mixed Cellulose Esters Filter Paper 13/25/50mmDiameter 0.22/0.45um

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