4A molecular sieve adsorbent is a clay-bound sodium form of type a molecular sieve. 4A molecular sieve will adsorb molecules with critical diameters up to 4 angstroms. It adsorbs water and ethanol, but not larger molecules like propane. 

Applications: 
4A molecular sieve is recommended for deep drying of gases and liquids, such as natural gas alkane, air, carbon dioxide etc. 4A molecular sieve is used for static drying for electronic component and hygroscopic substance and dehydration of coating and polyester. 
Top also supply specialty 4A products: 4A-dg for natural gas and saturated hydrocarbon dehydration; 4A-LNG for natural gas purification for cryogenic storage.