1.05741

Molecular sieve 0.3 nm

rods ~ 1.6 mm (1/16")

• Synonym(s): Molecular sieve 0.3 nm, Sodium aluminium silicate
• CAS Number: 1318-02-1
• UNSPSC Code: 41123003
• EC Index Number: 215-283-8
• NACRES: NB.21

Properties

• Quality Level: 200
• form: rod
• surface area: 800 m²/g
• loss: ≤10% loss on ignition, 950°C
• particle size: ~1.6 mm
• pore size: 0.3 nm
• pH: 8-11 ( in H₂O)
• mp: >1600 °C
• bulk density: 700‑750 kg/m³
• storage temp.: no temp limit

Description

General description

Molecular sieves are crystalline, synthetic zeolites. Their crystal gratings are similar to a cage with numerous hollow spaces. The cavities are accessible from all sides by pores of exactly defined dimensions.

Application

Molecular sieves can be used:      

• in desiccators and drying tubes      
• for keeping absolute solvents dry      
• for drying gases or solvents in drying columns    
• for selective adsorption

Features and Benefits

• Easy to use: practically chemically inert, non-toxic, no disposal problems, dried liquids can be decanted      
• High adsorption capacity even with a low water content of the substance to be dried     
• High adsorption capacity even at high temperatures      
• High adsorption affinity for polar and unsaturated organic molecules (however, H₂O is always preferentially adsorbed)     
• Selective adsorption: only molecules that can pass through the pores are adsorbed

Analysis Note

Identity: conforms
Loss on ignition (950 °C): ≤ 10 %
Water absorption capacity (24 hrs.,80 % relative humidity): ≥ 15 %

Safety Information

• Storage Class: 13 - Non Combustible Solids
• wgk_germany: nwg
• flash_point_f: Not applicable
• flash_point_c: Not applicable