GIEBEL Xdry® - for protecting your systems more efficiently against moisture ingress.
High contrast color indicator
High water absorbtion capacity
Can be used at high temperatures
Can be used at low humidity levels
Dries your systems - even better!
The lower the moisture content of the air flowing into your system, the lower the risk of moisture damage such as rust, reduced oil quality and insufficient lubrication - which is why we fill our adsorbers with GIEBEL Xdry®.
The mixture combines the strengths of two high-performance desiccants useing the high water absorption capacity and the high-contrast color indicator of silica gel orange-green as well as the strong binding energy of molecular sieve 13X to polar substances. It outperformes air dryers filled with pure silica gel in terms of drying performance and when used at high temperatures or low humidity levels.
How it works.
The two desiccants contained in GIEBEL Xdry®, orange-green silica gel and molecular sieve 13X, adsorb moisture in different ways.
Silica gel has a large open-pored surface structure in which water molecules attach themselves to the capillaries. The silicon dioxid physically absorbs moisture due to Van der Waals forces acting there. The intermolecular bonds are particularly strong at high humidity and moderate temperatures.
Molecular sieve has a structure similar to a grid. Its size determines which molecules can pass through and which cannot. The zeolith absorbs moisture through selective adsorption, whereby water molecules are bound due to their size and polarity. This adsorption is stronger than with silica gel and also works at low humidity levels and high temperatures.
Unloaded
Half loaded
Fully loaded
The color indicates when its time for change.
The silica gel granules contained in GIEBEL Xdry® indicate when the adsorber needs to be replaced by changing color from orange to green. This is due to the pH indicator contained in the silica gel, which appears orange in an acidic environment and green in an alkaline environment. As the water content increases, the pH value rises and initiates the color change.
Technical data.
| DESICCANTS | SILICA GEL ORANGE-GREEN | MOLECULAR SIEVE 13X |
| GRAIN SIZE(MM) | 3 - 5 | 3 - 5 |
| ACTUAL PORE SIZE(NM) | 0.75 | |
| EFFECTIVE PORE SIZE(NM) | 0.9 - 1.0 | |
| BULK DENSITY(KG/L) | 0.78 | 0.60 |
| PORE VOLUME(ML/G) | 0.35 - 0.45 | 0.35 - 0.7 |
| FRACTURE STRENGTH(N) | >200 | >60 |
| SPECIFIC SURFACE AREA(QM/G) | 600 - 800 | 650 - 1250 |
| 575°C LOSS OF IGNITION(%) | <2.0 | |
| ABRASION RATE(%) | <2 | <0.2 |
| WATER ABSORPTION CAPACITY(ML/KG) | >370 | >210 |
| DESICCANTS | SILICA GEL ORANGE-GREEN | MOLECULAR SIEVE 13X |
| GRAIN SIZE(MM) | 3 - 5 | 3 - 5 |
| ACTUAL PORE SIZE(NM) | 0.75 | |
| EFFECTIVE PORE SIZE(NM) | 0.9 - 1.0 | |
| BULK DENSITY(KG/L) | 0.78 | 0.60 |
| PORE VOLUME(ML/G) | 0.35 - 0.45 | 0.35 - 0.7 |
| FRACTURE STRENGTH(N) | >200 | >60 |
| SPECIFIC SURFACE AREA(QM/G) | 600 - 800 | 650 - 1250 |
| 575°C LOSS OF IGNITION(%) | <2.0 | |
| ABRASION RATE(%) | <2 | <0.2 |
| WATER ABSORPTION CAPACITY(ML/KG) | >370 | >210 |
| TROCKENMITTEL | SILICAGEL ORANGE-GRÜN | MOLEKULARSIEBE 13X |
| KORNGRÖSSE(MM) | 3 - 5 | 3 - 5 |
| TATSÄCHLICHE PORENGRÖSSE(NM) | 0.75 | |
| EFFEKTIVE PORENGRÖSSE(NM) | 0.9 - 1.0 | |
| SCHÜTTDICHTE(KG/L) | 0.78 | 0.60 |
| PORENVOLUMEN(ML/G) | 0.35 - 0.45 | 0.35 - 0.7 |
| BRUCHFESTIGKEIT(N) | >200 | >60 |
| SPECIFISCHE OBERFLÄCHE(QM/G) | 600 - 800 | 650 - 1250 |
| 575°C GLÜHVERLUST(%) | <2.0 | |
| ABRIEBRATE(%) | <2 | <0.2 |
| WASSERAUFNAHMEKAPAZITÄT(ML/KG) | >370 | >210 |
| TROCKENMITTEL | SILICAGEL ORANGE-GRÜN | MOLEKULARSIEBE 13X |
| KORNGRÖSSE(MM) | 3 - 5 | 3 - 5 |
| TATSÄCHLICHE PORENGRÖSSE(NM) | 0.75 | |
| EFFEKTIVE PORENGRÖSSE(NM) | 0.9 - 1.0 | |
| SCHÜTTDICHTE(KG/L) | 0.78 | 0.60 |
| PORENVOLUMEN(ML/G) | 0.35 - 0.45 | 0.35 - 0.7 |
| BRUCHFESTIGKEIT(N) | >200 | >60 |
| SPECIFISCHE OBERFLÄCHE(QM/G) | 600 - 800 | 650 - 1250 |
| 575°C GLÜHVERLUST(%) | <2.0 | |
| ABRIEBRATE(%) | <2 | <0.2 |
| WASSERAUFNAHMEKAPAZITÄT(ML/KG) | >370 | >210 |
Break through curve:
Isotherm:
Loading process:
Residual humidity:
Water entry:
FAQ regarding GIEBEL Xdry®.
With a maximum water absorption of 35% at 100% RH and 20°C in the climate chamber, GIEBEL Xdry® initially appears to be at a disadvantage compared to pure silica gel with a water absorption of 40%. However, since in practice adsorbers are already fully loaded and discolored green at a water absorption of approx. 33% - i.e. the cartridge (disposable adsorber) or the desiccant (reusable adsorber) needs to be replaced - the slightly lower water absorption of the mixture does not come into play.
The advantages of the GIEBEL Xdry® mixture are particularly evident in its drying performance. Up to a load of 25%, more water remains in the adsorber, i.e. less water enters the system. Towards the end of the product life cycle, at a loading between 25% and 35%, both fillings behave more or less the same.
The higher isotherm of GIEBEL Xdry® at lower humidity levels additionally allows use in dry environments from 30% RH.
The silica gel grains contained in the GIEBEL Xdry® change color to green to indicate that the adsorber or desiccant filling needs to be replaced.
Adsorbers filled with GIEBEL Xdry® can also be used at temperatures above 80°C. Although the water absorption of the contained silica gel is limited at these high temperatures, the molecular sieve has a constant water absorption up to approx. 250°C.
Due to the different regeneration temperatures of the silica gel and molecular sieve contained in GIEBEL Xdry® , regeneration of the desiccant is not recommended. If silica gel is heated to over 120°C, the color indicator it contains burns out and turns brown. Temperatures below 250°C, on the other hand, have no significant effect on the regeneration of the molecular sieve.
The bed of our adsorbers filled with GIEBEL Xdry® is therefore replaced after complete loading. We offer refill packs in various sizes for this purpose.
The components silica gel orange and molecular sieve are classified as non-hazardous substances according to the law of the European Union (Regulation EC No. 1272/2008). They are not subject to mandatory labeling according to the EC Directive (67/548/EEC or 1999/45/EC).
GIEBEL Xdry® is thus also classified as a substance that is not hazardous to health or the environment.