MetaPurex nano-porous aluminum oxide (AAO) ceramic 25 mm diameter discs with 60 nm pore size diameter. Fits standard Lauer lock filter holder. Pore: local hexagonal packing (honeycomb) order with 60 nm pore size of maximum variation 10%. Membrane thickness is 50 microns. Micro-crack free heat sealed edges requires no o-ring protection, leaving larger filtration surface.
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