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Sigma Aldrich Fine Chemicals Biosciences Molecular sieves 3 A bead5KG
Supplier: Sigma Aldrich Fine Chemicals Biosciences 2085745KG
Molecular sieves are crystalline metal aluminosilicates having a 3-dimensional interconnecting network of silica and alumina tetrahedra. Natural water of hydration is removed from this network by heating to produce uniform cavities which selectively adsorb molecules of a specific size. The 3A form is made by substituting potassium cations for the inherent sodium ions of the 4A structure reducing the effective pore size to ~3A… excluding diameter 3A… e.g. ethane. The 4 to 8-mesh type is normally used in gas-phase applications. Molecular sieves are considered a universal drying agent in polar and nonpolar media.
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