... properties; used widely in industry 1. Performance characteristics:4A molecular sieve's aperture is 4A,it adsorbs water, methanol, ethanol, hydrogen ... molecular. It is one of the largest varieties of molecular sieve in industry use. 2. Molecular formula: Na2O· Al2O3 ·2. ... foil bags of vacuum-packed 6.Notes: Before use molecular sieve should prevent pre-adsorbed water, organic gases or liquids.Otherwise ...