ENGLISH
October 9, 2025
Silica, also called silicon dioxide (SiO₂), is a chemical compound that is found everywhere in nature: in sand, rocks, glass, but also in certain everyday products such as dehumidifier bags.
There are two main types of silica: crystalline silica, which is non-porous, and amorphous silica, better known as silica gel.
Crystalline silica: natural but non-porous
Crystalline silica is a form where silicon and oxygen atoms are perfectly ordered.
It is mainly found in sand, quartz or even some natural stones.
This structure gives it great stability but no porosity, making it useless for humidity control.
It does not adsorb water vapour — unlike the materials used in desiccants or anti-humidity bags.
Amorphous silica (or silica gel): porous and absorbent
Amorphous silica, also called silica gel or Silica gel in English, has a porous structure. These micro-pores allow it to absorb water vapor and regulate ambient humidity.
That's why it's often found in dehumidifier bags found in packaging, shoeboxes, or shipping containers to avoid condensation and damage-related damage.
Depending on its manufacturing method, the size of the pores and the adsorption capacity can vary greatly, which influences its effectiveness.
Silica, a safe and effective desiccant
Porous amorphous silica is chemically neutral, non-toxic, and inert. It does not react with the products it protects and does not emit any harmful substances.
This makes it a moisture absorber widely used in the storage of sensitive products such as electronic components, archives, or textiles.
👉 It is an ideal humidity controller in confined areas.
The dangers of crystalline silica
Conversely, powdered crystalline silica can be dangerous when inhaled as dust. These very fine particles can enter the lungs and cause a chronic lung condition called silicosis.
This risk mainly concerns professional environments handling silica (industry, construction, foundry, etc.), not desiccants based on amorphous silica.
Alternatives and innovations
Traditional silica-based desiccants are effective but limited: they need to be replaced regularly and are not naturally regenerative.
Innovative solutions, such as Air Sponge, use the same adsorption principle but in an ecological and sustainable way. Their structure makes it possible to naturally regulate humidity without energy or maintenance, while avoiding waste associated with disposable bags.
In summary
Silica is a natural and versatile material found in sand, glass, and many dehumidifying products.
In its amorphous form, it plays a key role in controlling humidity, while its crystalline form must be handled with care.
For sustainable and risk-free storage, choose safe, ecological and efficient solutions, such as Air Sponge.
