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Silica gel White (Water-resistent)

Silica gels are the most commonly used desiccants and consist of 99% silicon dioxide (SiO2). Silica gel white has a water absorption capacity of up to approx. 37% of the dry mass and can be easily regenerated in the oven. Silica gel white has no color indicator. While silica gels normally only absorb moisture from the air, water-resistant silica gel is also capable of absorbing liquid water. It is therefore used where condensation also causes water droplets, which are to be absorbed with the aid of the desiccant.



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Chemical properties

Chemical name: Amorphous silicon dioxide
Composition: SiO2
CAS number: 7631-86-9

Appearance and shapeRound, solid ballsCrystall granulesRound, solid balls
Grain size0,-1 mm / 1-3 mm / 2-5mm0,51 mm / 13 mm / 25 mm2-4mm
Bulk density0,75 – 0,85 kg/l0,380,45 kg/l0,60-0,70 kg/l
Pore volume0,35 – 0,45 ml/g0,851,0 ml/g0,35-0,45 ml/g
Breaking strength> 200 N>200 N70 N
Specific surface600 – 800 m²/g350450 m²/g550 – 650 m²/g
Silicon dioxide (SiO2)99%99.8%97%
Trace elements1%0.2%3%
Water adsorption capacity> 370 ml/kg>900 ml/kg> 370 ml/g


In practice, the most common regeneration method is temperature increase. When desorbing water vapor from silica gel, the temperature must be above 100°C. For silica gels without a color indicator, a regeneration temperature between 150°C and 175°C is recommended.