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The most common laboratory use of aluminum oxide (alumina) is making up TLC (thin-layer chromatography) plates from ordinary microscope slides. Calcium sulfate (CHCC15A), also known as Plaster of Paris, is used as a binder, to “glue” the alumina to the glass slide. The alumina and calcium sulfate are mixed in a slurry, using water or methylene chloride (UNCM08) as a solvent. That slurry is spread in a thin layer on the microscope slides and allowed to dry. Before use, the TLC plates are activated by heating them briefly in an oven. Although making them can be messy, such homemade TLC plates work about as well as very expensive commercial TLC plates, and the microscope slides can be recycled repeatedly. Our aluminum oxide is provided as a fine powder suitable for TLC plates. Warning! Harmful as dust. Irritant to skin, eyes, and mucous membranes.
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