CAS: 7631-86-9

Fumed Silica is a form of silicon dioxide, or silicon with molecular formula SiO₂ and a molecular weight of 60.0843 g/mol. Fumed silica is also known as pyrogenic silica
It is a white powder odourless consisting of droplets of fused silica cooled by forming three-dimensional chains which are organized into particles of amorphous matter of very low apparent density and very high specific surface area. Fumed silica is insoluble in water.

Production
Fumed silica is obtain from silicon sand. Product is reduced with carbon and then reacted with chlorine to obtain Silicon tetrachloride (SiCl₄).

Finally Silicon tetrachloride is pyrolyzed in a 3000°C electric arc.

SiCl₄ + 2H₂ + O₂ à SiO₂ + 4 HCl

Finally, silica droplets obtained, bind to each other by forming chains, then a three-dimensional network branched by cooling.

Features & Benefits:

• Anti-settling, thickening and sag resistance
• Free-flow and anti-caking
• Scratch resistance
• Abrasion resistance
• Corrosion resistance
• light-diffusing properties
• Reinforcement
• Desiccant
• stabilizer
• Thickening
• Anti-caking
• Enhanced adsorbency

Use

Fumed silica is mainly used in coatings, paints, adhesives, sealants, Agriculture and lawn care, composites, food additives, pharmaceuticals, printing, packaging, gel-cell batteries, cosmetics, toothpaste, …

Packaging

Fumed silica is available in 10kg craft bag.

Arpadis is one of the largest chemical distributors in Europe.

Arpadis operates the storage, transport, export & import formalities of Fumed Silica globally.