* TYPE 3A : Molecular Sieve is potassium form of aluminosilicate-zeolite. 3A will adsorb molecules which have a critical diameter less than three angstrom (He , H2 & CO)
* TYPE 4A : Molecular Sieve is sodium form of aluminosilicate-zeolite. 4A will adsorb molecules which have a critical diameter less than four angstrom (CO2 , H2O & NH3)
* TYPE 5A : Molecular Sieve is calcium form of aluminosilicate-zeolite. 5A will adsorb molecules which have a critical diameter less than five angstrom (CH3OH , C2H5OH & Propane)
* TYPE 13X : Molecular Sieve is a modified form of sodium zeolite with a pore diameter of 10 angstrom. 13X excludes molecules with effective diameter greater than 10 angstrom.

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