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Molecular Sieve

Molecular Sieve

Molecular sieve is a sodium aluminosilicate. It has a fixed pore size according to the material specified, 4 Angstrom being the most common.

Because of its higher cost, it is normally used for special process applications. Pressure dew points to -100° F may be achieved with molecular sieve depending on the dryer design and operating conditions.


  • Uniform retention capacity: Moisture retention (pounds of water adsorbed per pound of desiccant) does not change appreciably if the air or gas is not saturated. It also keeps its moisture retention properties over a wider range of operating temperatures.
  • Round bead shape: Spheres have high abrasion resistance and results in lower pressure drop than extruded molecular sieve.
Color and form Off White/ tan bead
Size 3-5 mm (1/8")
Bulk density 40 lbs/ft3 (+/- 10%)
Surface area 3.67 X 1000000 Sq.Ft/ lb
Static adsorption  
100% RH 23.0%
90% RH 22.0%
60% RH 21.0%
10% RH 19.0%