Details
Description
4A Molecular sieve is an alkali alumino-silicate. It is the
sodium form of the Type A crystal structure and has an effective
pore opening of 4 angstroms. It is used to dehydrate air and gases
in regenerative compressed air dryers and static drying. Molecular
sieves are 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 sieves are often used as a polishing layer for
dewpoints to 120° F.
MSDS
Download Desiccant Material Safety Data Sheet
(MSDS)
Features
- Dewpoints Down to 100° F. and Lower: molecular
sieves are often used as a polishing layer in dryers to achieve
dewpoints down to 120°F. This product 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: This feature of
molecular sieves also contributes greatly to lower pressure drop.
Importantly, it means far less dusting, migrativion / attrition and
longer life by not allowing clogging of desiccant pores.
Typical Properties
Color |
Light Tan |
Bead Size |
1/8'' |
Bead Mesh |
4 x 8 |
Bead MM |
2.5 - 4.5 |
Surface Area |
780m2/gram |
Pore Diameter |
4 angstroms |
Bulk Density |
45 lbs./ ft3 |
Crush Strength |
20 lbs. |
Equilibrium water capacity |
24% |
Water Content |
1.5% (MAX) |
Heat of adsorption |
1800 BTU/ lb Water |
Moisture retention @ relative humidity @
100% RH |
24% |
@ 90% RH |
24% |
@ 60% RH |
24% |
@ 10% RH |
24% |