4A Molecular Sieve is a sodium-based aluminosilicate desiccant designed for effective moisture removal from liquids and gases, while also adsorbing small molecules such as carbon dioxide, oxygen, and nitrogen. With a nominal pore size of 4 angstroms, it provides a versatile balance between drying efficiency and molecular adsorption, making it one of the most widely used grades in industrial drying and purification.

The material offers consistent adsorption speed, good contamination resistance, and reliable regeneration performance, supporting long service life across repeated cycles. Supplied in 4×8 mesh, 4A Molecular Sieve is well suited to dynamic systems where low pressure drop and stable flow characteristics are required, as well as static drying applications.

Key Features

  • Effective moisture removal from liquid and gas streams

  • Adsorbs small molecules including CO₂, O₂, and N₂

  • Consistent adsorption performance and strong cyclic stability

  • Good resistance to contamination and long operational life

  • Supplied in 4×8 mesh for low pressure drop in dynamic systems


Typical Applications

  • Refrigerant drying

  • Moisture removal in PU plastics and paint systems

  • Natural gas drying

  • Drying of cracked gas streams

  • Static drying of insulating glass units, air-filled or gas-filled

  • Dehydration of highly polar compounds, such as methanol and ethanol

  • Dehydration of unsaturated hydrocarbons (e.g. ethylene, propylene, butadiene)

  • Drying of compressed air and industrial gases

SKU MS4A48
Brand Desicco
Moisture Removal argon, krypton, xenon, ammonia, carbon monoxide, C2H4, C2H2, CH3OH, C2H5OH, CH3CN2, CS2, CH3CL, CH3Br, and carbon dioxide
Desiccant Alkali metal alumino-silicate
Type 4A
Dimensions 4x8 Mesh; 3-5mm Bead Size
RH Levels Lowers to 0-10% RH
Outer Bag Resealable moisture barrier bag w/ indicator card
Shelf Life 2 years in original (unopened) packaging

Static Water Absorption ≥20%
Crushing Strength ≥80N/pc
Bulk Density ≥0.7g/ml
Wear Ratio ≤0.2%
Sequence Rate argon, krypton, xenon, ammonia, carbon monoxide, C2H4, C2H2, CH3OH, C2H5OH, CH3CN2, CS2, CH3CL, CH3Br, and carbon dioxide