Merck, 1010781000, Aluminium oxide 90 active acidic (0.063-0.200 mm)

General description A versatile sorbent for preparative chromatography exhibiting a higher pH stability Features and Benefits Aluminum oxide 90 active acidic (0.063-0.200 mm) provides users with: An aluminum oxide crystal structure comprises octahedrally and tetrahedrally coordinated aluminum coupled by oxygen atoms. The surface is covered by free hydroxyl groups. There are different acidic and basic centers that result in anion and cation exchange properties. Aluminum oxide exhibits a higher pH-stability than silica gel, especially in the alkaline range and occurs in various crystal modifications resulting in different pore diameters. Packaging Plastic bottle Analysis Note Activity: I pH-value (10 % suspension): 3.5 - 4.5 Substances extractable by water: ≤ 0.2 % Chloride (Cl): ≤ 0.2 % Sulfate (SO₄): ≤ 0.1 % Speed of filtration: ≥ 0.3 ml/min Particle size: 70 % between 0.063 - 0.200 mm Setting of activity according to the Brockmann activity grades adjusted to a migration distance of 30 mm: I: activity I II: activity II III: activity III IV: activity IV V: activity V