Molecular sieve 4A is the most frequently used zeolite for drying air. This type A desiccant has 1x n modules, which means that these zeolites have the highest polarity and preferably exclude water.These are synthetically produced aluminosilicates. Zeolites of type 4A contain sodium in their crystal lattice (Na12[(AlO2)12(SiO2)12]), the resulting pore diameter is approx. 0.42 nm. This constant structure results in a very high inner surface area of up to 1000m²/g. Together with their high electrostatic adsorption forces, these molecular sieves are therefore ideal for air drying.
Molecular sieves achieve a high absorption capacity even at low relative humidity. Thus they are able to dry the supply air very strongly. This makes it useful wherever the degree of drying is a decisive selection criterion. The maximum water absorption in a fully saturated environment is about 23%. There is no colour indicator to indicate the loading condition.
Chemical Composition: Sodium-Aluminium-Silicate
CAS number: 1318-02-1
|Tatsächliche Porengröße||0,42 nm|
|Effective pore size||0,42 nm|
|Appearance and shape||Beige, solid balls|
|particle size||3 - 5 mm|
|bulk density||0,67 kg/l|
|pore volume||0,35 - 0,70 ml/g|
|breaking strength||>80 N|
|Specific surface||500 - 1000 m²/g|
|575°C Loss on ignition||<1,5 %|
|Abriebrrate of abrasionate||<0,25 %|
|water absorption capacity||>230 ml/kg|