SPI Supplies

ANOPORE™ Inorganic Aluminum Oxide Membrane Filters

Smallest pore sizes possible of any membrane filter


ANOPORE Inorganic Membrane Filters
Top view of a 0.2µm ANOPORE™; inorganic membrane (above) and a cross-sectional view (below) showing 0.23µm latex microspheres retained on the membrane's surface. Membrane thickness approximately 60µm. Note the extraordinarily high pore density, which makes possible otherwise unheard of flow rates for this small of a pore size membrane filter.

A word about semantics: Technically speaking, the raw sheet aluminum oxide membrane material is what is called ANOPORE inorganic membrane, but once it is cut out into discs, it is then called the Anodisc™; Membrane Filter.

The Anodisc™; inorganic membrane is fabricated from a unique form of aluminum oxide with a highly controlled, uniform capillary pore structure. Advantages over polymer membranes are many, including: The Anodisc aluminum oxide membrane filters are available in three nominal sizes (47 mm, 25 mm and 13 mm diameter) and three pore sizes (0.2 Ám, 0.1 Ám and 0.02 Ám). These filters are suitable for use in a wide range of specialized applications, including HPLC mobile phase filtration and degassing, bacterial analysis by epifluorescent light microscopy, ultra cleaning of solvents, gravimetric analysis and liposome extrusion.

Ideal for Microscopic Analysis
The sieve-like properties of the Anopore membrane enable microorganisms and particles retained on the membrane surface to be examined under an electron microscope. Additionally, the membrane is virtually transparent when wet, permitting examination by light microscopy without the need to transfer the retained material, a step that could very easily result in sample loss. We know that for most, it would be high temperature or aggressive media applications that would cause aluminum oxide membranes to come first to mind, however, we have since learned that the transparency feature in fact is the reason for the largest volume of the sales of this line of products. In addition, the tightly controlled pore size found in these membranes results in the Anapore system to be the most controlled filtration media available. There are no "doublets" or "triplets" (or sometimes worse) as is the case with some filtration media, and the very high pore density makes possible filtrations in a fraction of the time as what would be otherwise required.

Aluminum oxide membrane filters are non-cytotoxic, and were tested to USPXXI Class V and BS5736 Parts 1-5.

Holding the membrane filters:
All membrane filters, offered by SPI Supplies, irrespective of their construction, must be used in conjunction with a specially made membrane filter holder.

Technical Specifications

Chemical Compatibility Table

Support Ring Material

Information about cutting Anopore aluminum oxide membrane filter material

Note: 13 mm diameter does not come with support ring

Pore SizePore DensitySurface PorosityQuantityDiameterSPI #EachIn Stock
200 nm
109/cm2 25-30%100/pkg13mm A2213-MB$ 706.66 Add to cartYes
50/pkg25mm A2225-FA   865.82 Add to cartYes
50/pkg47mm A2247-FA  1441.07 Add to cartYes

100 nm
1010/cm2 40%100/pkg13mm A1113-MB  706.66 Add to cartYes
50/pkg25mm A1125-FA   865.82 Add to cartYes
50/pkg47mm A1147-FA  1578.72 Add to cartYes

20 nm
1011/cm2 50%100/pkg13mm A0113-MB  706.66 Add to cartYes
50/pkg25mm A0225-FA   865.82 Add to cartYes
50/pkg47mm A0247-FA  1283.38 Add to cartYes

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Thursday August 27, 2015
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