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Fumed silica

BCD Chemie has been marketing Cabot’s fumed metal oxides under the CAB-O-SIL® (fumed silica), SpectrAl® (fumed aluminium oxide) and CAB-O-SPERSE® (fumed silica dispersions) brands for many years.


Fumed silica is a finely divided amorphous silicon dioxide (SiO2) with a very large surface area. Fumed silica is used as a rheological additive in aqueous, solvent-based and 100% systems in coatings, adhesives and sealants or for oil for the production of greases as well as for oily cosmetics and care products. In addition, fumed silica is used as an anti-caking agent for powders, also in food industry (E 551) and in pharmaceuticals. Special applications include dye-receptive layers for high-quality inkjet printing.

CAB-O-SIL® are untreated hydrophilic silicas, which are offered with different surfaces and are also available in food and pharmaceutical grades. The hydrophilic silicas are mainly used in non-polar systems as rheological additives or as anti-caking agents. Surface-modified fumed silicas are also available, which are more effective in polar systems than the untreated ones. However, CAB-O-SIL® can also be used to stabilise emulsions without the addition of surfactants (pickering emulsions).


Water-pre-dispersed, surfactant-free fumed silica dispersions (CAB-O-SPERSE®) increase the scratch and corrosion resistance of aqueous coatings. CAB-O-SPERSE® dispersions can be easily incorporated into an aqueous system and are available with different surface finishes and pH values.


Fumed aluminium oxide is used as an anti-caking agent in powder coatings and to improve scratch and corrosion resistance in PU systems and in aqueous acrylics for wood coatings. SpectrAl® is available with different surface finishes.

Do you need more information?

Would you like to learn more about fumed silica? Then please contact us directly. Our experienced technicians and our product management will help you with all your questions.

Your contact person

Fumed Silica

Simone Jöhnk
Performance Chemicals

Phone: +49 40 77173 2528

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