Description General description Molecular sieves are made up of three dimensional interconnecting networks of silica and alumina tetrahedral. These crystalline metal aluminosilicates have uniform cavities to selectively adsorb specific size molecules. A 4A molecular sieve has an effective pore size of 4Å. Packaging 1 kg in poly bottle 2.5 kg in poly drum 25, 500 g in poly bottle Application Molecules with an effective diameter of 4 Å, including H2O, H2S, CO2, SO2, C2H4 and C3H6 are adsorbed. Legal Information SYLOSIV is a registered trademark of W.R. Grace & Co.-Conn.