... sieves 4A Application: 1) It is mainly used for adsorption of water, methanol, ethanol, hydrogen sulfide, sulfur dioxide, carbon dioxide, ... ethylene, propylene, and etc. 2)It is considered as one of the most important molecular sieve in industry, applied to the ... , refrigerant, etc. 3) it is used for preparation and purification of argon, medicine packaging, electronic components, static desiccation ...