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Item # MS-1140, Type 4A Molecular Sieve
4 x 8 Beads 5 lb

Type 4A Molecular Sieve

K12[(AIO2)12(SiO2)12] • X H2O
Molecular Sieve Type 3A, the potassium form of the Type A Crystal structure, is an alkali metal alumino-silicate. Available in powder and pellets for commercial dehydration of unsaturated hydrocarbon streams such as cracked gas, propylene, butadiene and acetylene. Type 3A is also used for drying polar liquids such as methanol and ethanol.

The sizes of both Mesh and Beads are specified jointly by the screen sizes that the material will pass through and retained by. For example, a 14 x 30 mesh product will pass through a 14 mesh screen, and be retained by a 30 mesh screen. Listed below are the screen openings for some common screen sizes.

Specifications  · Typical Physical Properties  · Molecular Sieve Information  · Other




5 lb

Typical Physical Properties

Nominal Pore Diameter (angstroms)


Particle Diameter (mm)1


Bulk Density (lb/ft³)


Heat of Adsorption (Btu/lb H20)


Crush Strength (lbs)


Equilibrium H20 Capacity (wt-%)2


Moisture Content (wt-%)

1 The length of the pellets is approximately twice the diameter.
2 Measured at 17.5mm HG and 25°C

Molecular Sieve Information

Form Detail

  • Beads are spherically shaped products.

Screen Size Chart

Screen Size Detail
Screen Size Opening (mm)
4 4.760
8 2.380
12 1.680
14 1.410
30 0.595


Safety and Handling

MATERIAL SAFETY DATA SHEET (MSDS) available on the top of this page.

More Information

See the UOP brochure entitled "Molecular Sieve Safety Bulletin for Manufacturers", or contact your ASGE representative.

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MSDS Type 4A 4x8
(PDF, 35KB)

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