The 3A molecular sieve is an alkali metal aluminosilicate with a pore opening of approximately 3 angstroms. Type 3A is made by ion-exchanging the sodium in the type 4A sieve with potassium. The 3A molecular sieve will exclude most molecules except water, making it very selective. This type of bead also has advantages in crush strength, durability and high rate of adsorption. The 3A molecular sieve can remove moisture in both liquid and gas applications. Type 3A is used in the production of insulated glass, refrigerant drying, general moisture removal and the drying of natural gas, hydrocarbon liquids, ethanol and reactive monomers such as olefins.