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
Do you need a Chemical Compatibility Chart?
We have a Chemical Compatibility Chart that you can use for reference.
Aluminum Oxide (AO) Handling Tips
AO Membranes are extremly brittle. Click here to see our blog for handling the membranes
Are the aluminum oxide membrane filters asymmetric and, if so, which surface has the smallest pores?
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.
What can be used to dissolve the aluminum oxide membrane filters?
The aluminum oxide membrane filters can be readily dissolved with sodium hydroxide solutions at 1M concentration or higher. The time required to dissolve the membrane can be reduced by elevating the temperature and/or increasing the concentration.
Are the aluminum oxide membrane filters available with a perimeter support ring?
The Sterlitech aluminum oxide membrane filters are not available with perimeter support rings. However, when handled with care, they are suitable alternatives to competitive aluminum oxide membrane filters with ring supports.
Can the aluminum oxide membrane filters be used as alternatives for the Whatman Anodisc filters?
Yes, the Sterlitech aluminum oxide membrane filters can be used as alternatives for the Whatman Anodisc filters. Our alumina filters do not have perimeter support rings, so somewhat greater care must be taken when handling the filters to avoid damage.
Are the aluminum oxide membrane disk filters available in diameters not listed in the ordering information?
Unfortunately, we are unable to supply the aluminum oxide membrane filters with custom diameters. Please contact us at [email protected] to inquire about alternatives.
What are the advantages of Aluminum Oxide membrane filters?
Aluminum oxide is free of organic extractables and leachables and shows minimum adsorption.