Molecular Sieve 3A is an alkali metal aluminosilicate; Molecular sieve 3A is the potassium form of the type A crystal structure. Molecular sieve 3A adsorbs water and exclude molecular.
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