... when used in dehydration), or heating under high vacuum.3A (pore size 3 Å): Adsorbs NH3, H2O, (not C2H6), good for drying polar liquids ... -240.3-0.5Absorbent for removal of thioalcohol in aviation kerosen and the liquid hydrocarbon No powder Molecular Sieve 3A, 4A, 5A,13X 13X ...