Molecular Sieve 1.BV&SGS certified manufacturer molecular sieve 2.MF:Na2O,Al2O3,2.53SiO2,6H2O 3.Molecular Sieve for Ethanol Molecular Sieve1.Molecular Sieve 3A is an alkali metal alumino-silicate; it is the potassium form of the type A crystal structure.Type 3A has an effective pore opening of about 3 angstroms (0.3nm). This is large enough to allow in moisture, but excludes molecules such as ...