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Merck
Whatman® ME membranes for microbiological control ME25/31 STL membrane circle black, diam. 50 mm, pore size 0.45 μm, white grid, sterile

Whatman® mixed cellulose ester ME 25/31 filter discs 0.45 μm pore size

Whatman® ME membranes for microbiological control ME25/31 STL membrane circle black, diam. 50 mm, pore size 0.45 μm, white grid, sterile