high quality molecular sieve 1)10 years professional manufacturer for 3A, 4A,5A, 13X 2)drying,absorbent,cleaning ect. producthigh quality molecular ... dehydration), or heating under high vacuum.3A (pore size 3 Å): Adsorbs NH3, H2O, (not C2H6), good for drying polar liquids.4A ... , C3H6, EtOH. Will not adsorb C3H8 and higher hydrocarbons. Good for drying nonpolar liquids and gases.5A (pore size 5 ...