... 5A, 13X drying,absorbent,cleaning ect. ISO9001:2000 product2.0 to 2.8mm molecular sieveProduct descriptionMolecular sieve is a material containing tiny ... include pressure change (as in oxygen concentrators), heating and purging with a carrier gas (as when used in dehydration), or heating ... , (not C2H6), good for drying polar liquids.4A (pore size 4 Å): Adsorbs H2O, CO2, SO2, H2S, C2H4, C2H6, C3H6, EtOH. ...