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Frequently Asked Questions

Learn more on what Sterlitech Corporation has to offer. Find answers to your questions about our filtration products here!

Alumina Oxide (AO) FAQ

AO Membranes are extremly brittle. Click here to see our blog for handling the membranes

Yes, the aluminum oxide membrane filters are somewhat asymmetric. The shiny side of the filter is the surface with the smallest pores. The shiny side faces up in the packaging.

<p><span data-sheets-value="{&quot;1&quot;:2,&quot;2&quot;:&quot;The alumina oxide membrane filters can be readily dissolved with sodium hydroxide solutions at 1M concentration or higher.\u00a0 The time required to dissolve the membrane can be reduced by elevating the temperature and/or increasing the concentration.&quot;}" data-sheets-userformat="{&quot;2&quot;:9089,&quot;3&quot;:{&quot;1&quot;:0},&quot;10&quot;:0,&quot;11&quot;:4,&quot;12&quot;:0,&quot;16&quot;:8}">The aluminum oxide membrane filters can be readily dissolved with sodium hydroxide solutions at 1M concentration or higher.&nbsp; The time required to dissolve the membrane can be reduced by elevating the temperature and/or increasing the concentration.</span></p>
<p><span data-sheets-value="{&quot;1&quot;:2,&quot;2&quot;:&quot;The Sterlitech alumina oxide membrane filters are not available with perimeter support rings.\u00a0 However, when handled with care, they are\u00a0suitable alternatives to competitive alumina oxide membrane filters with ring supports. &quot;}" data-sheets-userformat="{&quot;2&quot;:9089,&quot;3&quot;:{&quot;1&quot;:0},&quot;10&quot;:0,&quot;11&quot;:4,&quot;12&quot;:0,&quot;16&quot;:8}">The Sterlitech aluminum oxide membrane filters are not available with perimeter support rings.&nbsp; However, when handled with care, they are&nbsp;suitable alternatives to competitive aluminum oxide membrane filters with ring supports.&nbsp;</span></p>

Yes. Sterlitech aluminum oxide (AAO) membrane filters can be used as alternatives to Whatman Anodisc filters. Please note that Sterlitech alumina membrane filters do not have perimeter support rings, so additional care is recommended during handling to prevent damage.

Unfortunately, we are unable to supply the aluminum oxide membrane filters with custom diameters. Please contact us at [email protected] to inquire about alternatives.

Aluminum oxide (anodic aluminum oxide, AAO) membrane filters are free of organic extractables and leachables, making them ideal for high-purity filtration. They exhibit very low nonspecific adsorption, helping preserve sample integrity and maximize analyte recovery. Their inorganic structure provides excellent chemical and thermal stability, along with uniform pore size and high porosity, supporting reliable, efficient filtration in analytical and research applications.

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