10 years professional manufacturer for molecular sieve 3A, 4A,5A, 13X appearance:sphere /pellet ISO9001:2000 Product descriptionMolecular sieve ... Å): Adsorbs NH3, H2O, (not C2H6), good for drying polar liquids.4A (pore size 4 Å): Adsorbs H2O, CO2, SO2, H2S, C2H4, C2H6 ...