Molecular sieves


Molecular sieves are desiccants with very specific properties. They are synthetically produced alumina silicates. Zeolites will differentiated because of their crystal lattice structure, since this gave them different sized of pores. Type A zeolites containing sodium in their crystal lattice, characterized the pore diameter is approximately 0.4 nm (pore 4A). In the ventilation drying moreover the molecular sieves 3A (pores with 3.8 nm) and 13X (pores with 9-10 nm) are used. The structure of the crystal lattice constant allows a very high internal surface area of up to 1000 m² / g. Along with their high electrostatic adsorptive these molecular sieves are ideal for air drying.

Already at low relative humidity molecular sieves reach a higher capacity. Thus, they are able to dry the supply air very strong. This recommended the use in all cases where the degree of drying is a critical selection criterion. The maximum water uptake is located in a fully saturated environment at about 24% (molecular sieve 4A). A color indicator to show the charge state does not exist.

GIEBEL Molekularsiebe



  Data Sheet Molecular Sieve 3A

 Data Sheet Molecular Sieve 4A

 Data Sheet Molecular Sieve 13X

 More Documents



Molecular sieve 3A

GIEBEL Molekularsieb 3A

Molecular sieve 4A

GIEBEL Molekularsieb 4A

Molecular sieve 13X

GIEBEL Molekularsieb X13

Basic feature hydrophilic
Pores 0,38 nm
Pores 0,42 nm
Pores 0,9-1,0 nm
Main components SiO2, Na2O,
SiO2, Na2O,
Al2O3, K2O
SiO2, Na2O,
Grain size [mm] 3,0-5,0 3,0-5,0 3,0-5,0
Bulk density [kg/m³] 700-800 700-800 600-800
Capacity at 25°C [weight-%]      
20% rF 20 20 22
40% rF 20 20 25
60% rF 21 21 25
80% rf 23 23 26
100% rF 24 24 38
Pore volume [cm³/g] 0,35-0,45 0,35-0,45 0,35-0,70
Specific surface [m²/g] 500-1000 500-1000 650-1250
Color change without without without
Regeneration [°C] at about 300°C at about 300°C at about 300°C


Features Molecular sieve 3A Molecular sieve 4A Molecular sieve 13X
Adsorption capacity - - -
Low residual moisture after drying ++ ++ ++
Color indicator -- -- --
Efficiency at higher temperatures ++ ++ ++
Self-regeneration -- -- --
Regeneration at 120°C -- -- --
Safety ++ ++ ++
Water resistance + + +

++ very good; + good; o neutral; - bad; -- very bad

Color indicator


GIEBEL Molekularsieb


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