Medicine: load silver zeolite antibacterial agent. 5Å Chemical formula: 0.7CaO•0.30Na2O•Al2O3•2.0SiO2 •4.5H2O Silica-alumina ratio: SiO2/ Al2O3≈2 Production 5A molecular sieves are produced by cation exchange of calcium for sodium in 4A molecular sieves (See above) Usage Five ångström (5Å) molecular sieves are often utilized in the petroleum industry, especially for the purification of gas streams and in the chemistry laboratory for separating compounds and drying reaction starting materials. They contain tiny pores of a precise and uniform size, and are mainly used as an adsorbent for gases and liquids. Five ångström molecular sieves are used to dry natural gas, along with performing desulfurization and decarbonation of the gas. They can also be used to separate mixtures of oxygen, nitrogen and hydrogen, and oil-wax n-hydrocarbons from branched and polycyclic hydrocarbons. Five ångström molecular sieves are stored at room temperature, with a relative humidity less than 90% in cardboard barrels or carton packaging. The molecular sieves should not be directly exposed to the air and water, acids and alkalis should be avoided. Selecting molecular sieves Molecular sieves are available in different shape and sizes. But the spherical beads have advantage over other shapes as they offer lower pressure drop, are attrition resistant as they do not have any sharp edges, and have good strength, i.e. crush force required per unit area is higher. Certain beaded molecular sieves offer lower heat capacity thus lower energy requirements during regeneration. The other advantage of using beaded molecular sieves is bulk density is usually higher than other shape, thus for same adsorption requirement molecular sieve volume required is less. Thus while doing de-bottlenecking, one may use beaded molecular sieves, load more adsorbent in same volume, and avoid any vessel modifications. See also Lime (mineral) References External links Sieves Put A Lid On Greenhouse Gas Molecular Sieve Safety About Molecular Sieves Filters Desiccants Vacuum Chemical process engineering Industrial gases Gas technologies