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MetaPurex nano-porous aluminum oxide (AAO) ceramic discs converts your standard Buchner filter into a nano-filtration device. Fits selected  Buchner funnel filters, 90 mm diameter.  Pore size of 60 nm with a maximum variation of 10%. Membrane thickness is 50 microns.  Micro-crack free heat sealed edges requires no o-ring protection, providing an effective larger filtration surface.

MetaPurex Ceramic Membrane for Buchner Funnel, Large 90 mm, 3/Pk

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