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4A Molecular Sieve
Molecular sieve desiccant is an alkali alumino-silicate. It is a sodium form of Type A  crystal structure. Its effective
pore opening is 4 angstroms.
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A common 4A molecular sieve application is dehydrating compressed air. In a desiccant air dryer molecular sieve is regenerated by heating and purging. Regeneration temperatures must be 400° to 600° F, but are not to exceed
1000° F. The degree of regeneration depends on the temperature reached in purge. Molecular sieve is often used as a polishing layer in air dryers to reach dewpoints of -120° F.
Molecular Sieve MSDS
4A Molucular Sieve MSDS (Material Safety Data Sheet)
4A Molecular Sieve Features
- Dewpoints Down to 100° F. and Lower: molecular sieves are often used as a polishing layer in molecular sieve dryers to achieve dewpoints down to -120°F. Molecular sieve is the most effective desiccant for low inlet, relative humidities, generally below 30-35% RH.
- Uniform Size = Low Pressure Drop in a packed bed, molecular sieve provides a low pressure drop which minimizes channeling and maximizes utilization of the whole drying capacity of the compressed air dryer tower.
- Round Smooth Beads/Low Abrasion: Round and smooth beads contributes to a low pressure drop. Low abrasion means less dusting, migration / attrition and longer desiccant life.
| Typical 4A Molecular Sieve Properties |
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Property
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MS4A18
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MS4A116
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Color
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Light Tan
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Light Tan
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Bead Size
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1/8''
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1/16''
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Bead Mesh
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4 x 8
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8 x 12
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Bead MM
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3 - 5
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1.5 - 2.5
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Surface Area
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780m2/gram
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780m2/gram
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Pore Diameter
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4 angstroms
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4 angstroms
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Bulk Density
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45 lbs./ ft3
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45 lbs./ ft3
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Crush Strength
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20 lbs.
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9 lbs.
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Equilibrium water capacity
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24%
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24%
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Water Content
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1.5% (MAX)
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1.5% (MAX)
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Heat of adsorption
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1800 BTU/ lb Water
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Moisture retention @ relative humidity
@
100% RH
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24%
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24%
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@ 90% RH
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24%
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24%
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@ 60% RH
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24%
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24%
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@ 10% RH
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24%
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24%
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