4A Molecular Sieve

Our 4A molecular sieve products are alkali metal aluminosilicates in the sodium form of the Type-A crystal structure.

Chemical Formula:  Na12[(AlO2)12(SiO2)12] • nH2O

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4A molecular sieve

Our 4A molecular sieve products are alkali metal aluminosilicates in the spherical form. They are the sodium form of the Type-A crystal structure with an effective pore opening of 4 Angstroms. Our 4A molecular sieve will adsorb molecules such as oxygen, nitrogen, carbon dioxide, and straight chain hydrocarbons. We offer our 4A molecular sieve in bead and pellet form in the mesh sizes specified below. For all 4A molecular sieve types, aromatics and branched chain hydrocarbons will not be adsorbed.

Molecular sieve is also known as a zeolite. A zeolite is a conformation of hydrated aluminosilicates of sodium, potassium, calcium, or other cations. Zeolites can be dehydrated and rehydrated, making them useful in drying applications. These materials can also be used for cation exchange and as sieves on a molecular level. The molecular formula of a zeolite, namely the cations found in the molecules, determines the size of its pore openings.

Product Adsorbent Type Size
mSORB® 4A812B Molecular Sieve 4A 8 x 12 Mesh
mSORB® 4A48B Molecular Sieve 4A 4 x 8 Mesh
mSORB® 4A1430B Molecular Sieve 4A 14 x30 Mesh

Additional resources about Molecular Sieve can be found in our industrial adsorbent and desiccant resources section.



Additional information


Store 4A molecular sieve in a dry location to prevent premature water adsorption. Do not store super sacks outside; ultraviolet radiation and other adverse conditions will negatively impact its integrity and may eventually cause the bag to fail. Reseal packages after opening to prevent contamination and unintended water adsorption. We recommend that you rotate stock so the oldest material is used first.

Typical Applications

Adsorption of straight chain hydrocarbons
Air dryer desiccant
Carbon dioxide adsorption
Commercial drying of saturated hydrocarbons
Nitrogen adsorption
Oxygen adsorption
Packaging of electronics, perishable chemicals, and other moisture-sensitive goods
Purification of various gas and liquid streams
Removal of CO2 from gas and air streams
Water scavenger in paint and plastic systems


Drums: 150 kg / 330 lb
Super Sacks: Fill weight to order specification