4A molecular sieve Chemical Formula:Na2O稟l2O3?SiO2?/2H2O Si/Al ratio:SiO2/Al2O3=2 Pore diameter:About 4A Use:Desiccant for gas and other material; adsorbent for Ar purification for the separation of methane, ethane and propane. Reactivation: 1. Removal of water: Hot gas at 200-350 degree C and pressure 0.3-0.5kg/cm2 flows through the molecular sieve bed for 3-4 h. let temperature decreases down to 110-180 degree C, cooling. 2. Removal of organics: Regeneration is achieved by means of steam treatment to remove organics, and then remove water with method1. Conservation: Room temperature, humidity below 90%,non-expose to air; non-contact with water, acid and alkali. Packing: 30kg (10 gallon) steel pail 150kg (bead,55 gallon) steel pail 130kg (pellet,55 gallon) steel pail