Merck, 1010789020, Aluminium oxide 90 active acidic (0.063-0.200 mm)

Aluminium oxide 90 active acidic (0.063-0.200 mm) is designed for column chromatography as an acidic, active alumina sorbent. This pack contains 20 kg in an aluminium drum. The material is Activity I and has a particle-size distribution in which at least 70% falls between 0.063 and 0.200 mm. A 10% suspension has a pH of 3.5 to 4.5, defining the acidic character of the chromatographic medium. Water-extractable substances are limited to 0.2%, chloride to 0.2%, and sulfate to 0.1%. The filtration-speed requirement is at least 0.3 mL/min. Storage is at +2 °C to +30 °C. These controlled physical and chemical properties support use of the material as a bulk chromatographic sorbent where the acidic activity stage and defined particle range are important to the chosen separation workflow. The large 20 kg pack is suitable for laboratories or production settings that consume bulk sorbent rather than prepacked columns, while the stated particle-size range and activity grade allow the material to be selected without substituting a neutral alumina or a different particle distribution. The product is therefore a bulk stationary-phase material rather than a prepacked analytical column. Its Activity I grade, acidic suspension pH, and defined coarse particle range are the key selection parameters for chromatographic methods that specifically require this alumina type.