SPI Supplies

Anopore™ Inorganic Aluminum Oxide Membrane Filters

Chemical Compatibility Table

The chemical compatibility table given below is conservatively stated. For those applications for which there are literally no alternatives, we would like to make the point about what we call "marginal applications". For example, note the the table lists NaOH as being "not recommended" for use. Indeed, an Anopore membrane filter submerged in 1M NaOH will dissolve in about ten minutes.

Yet in the limit, at infinite dilution, where there will be a pH of 7, we know that the membrane will not dissolve and will in fact work quite well. So the question is where is that "line" up until which one could operate with some element of confidence.

In the case of NaOH, in a 0.1N solution, after about one hour, the membrane is still mostly present. And the main changes have occurred in the membrane thickness, not in the pore size, that is, there has been no collapsing of pores. So the point is, if the filtration can be done fast enough, at lower temperatures, for example, one should be able to, in many instances use the membrane short terms even for some of the "not recommended" environments.

Obviously, the end user has to be the one to do the appropriate testing to confirm that the aluminum oxide membrane filters are indeed appropriate for the intended application.


Chemical compatibility table for 0.02, 0.1 and 0.2µm pore size Anopore membrane
Acids
Acetic acid, glacial R
Acetic acid 5% R
Boric acid R
Hydrochloric acid (conc.) N
Nitric acid R
Sulphuric acid (conc.) N
Bases
Ammonium hydroxide (6M) N
Sodium hydroxide N
Solvents
Acetone R
Acetonitrile R
Amyl acetate L
Amyl alcohol R
Benzene * R
Benzyl alcohol R
Brine R
Butyl alcohol R
Butyraldehyde R
Carbon tetrachloride * R
Cellosolve (ethyl) R
Cellosolve (acetate) R
Chlorobenzene * R
Chloroform * R
Cyclohexane R
Cyclohexanone R
Dimethyl formamide L
Dimethyl sulphoxide L
Dioxane R
Ethyl acetate R
Ethyl alcohol R
Ethyl ether R
Ethylene glycol R
Formaldehyde L
Freon R
Glycerine (glycerol) R
Heptane R
Hexane R
Hypo (photo) R
Isobutyl alcohol R
Isopropyl acetate R
Isopropyl alcohol R
Kerosene R
Methyl alcohol R
Methylene chloride R
Methylethyl ketone R
Methyl formate R
MIBK R
Mineral spirits R
Nitrobenzene L
Pentane * R
Perchloroethylene * R
Petroleum ether R
Phenol L
Polyethylene glycol L
Pyridine R
Silicone oils R
Tetrahydrofuran R
Trichloroethane * R
Trichloroethylene * R
Triethylamine R
Toluene R
Xylene R
R = recommended N = not recommended L = limited application (testing prior to use recommended). Recommendations are based on static exposure for 48 hours at 25° C and one atmosphere (14.7psi). pH range 3.5 to 9.5.
*Limited application for Anotop syringe filters. Testing prior to use is strongly recommended. Avoid strong acids and alkalis.


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Friday July 04, 2008
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