high quality molecular sieve 1)10 years professional manufacturer for 3A, 4A,5A, 13X 2)drying,absorbent,cleaning ect. producthigh quality molecular sieveProduct descriptionMolecular ... carrier gas (as when used in dehydration), or heating under high vacuum.3A (pore size 3 Å): Adsorbs NH3, H2O, (not ... and the liquid hydrocarbon Package can meet individrual requirements high quality molecular sieve