high quality molecular sieve 1)10 years professional manufacturer for 3A, 4A,5A, 13X 2)drying,absorbent,cleaning ect. producthigh quality molecular ... gas (as when used in dehydration), or heating under high vacuum.3A (pore size 3 Å): Adsorbs NH3, H2O, (not C2H6), ... hydrocarbons. Good for drying nonpolar liquids and gases.5A (pore size 5 Å): Adsorbs normal (linear) hydrocarbons to nC4H10, alcohols to ...