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Merck
Whatman® Cyclopore® polycarbonate and polyester membranes Cyclopore PC Circles, pore size 0.4 μm, diam. (25 mm), pack of 100 ea

Whatman® polycarbonate Cyclopore® filter discs 0.4 μm pore size

Whatman® Cyclopore® polycarbonate and polyester membranes Cyclopore PC Circles, pore size 0.4 μm, diam. (25 mm), pack of 100 ea