Silica Fume, gray, uncompacted




Uncompacted, light gray micro silica having a SiO2 content of about 85% (typically ca. 92%), mixed. ASTM C1240.



Microsilica (or silica fume) is a by-product from the production of silicon or ferro-silicon, but also of zirconium (ZrO2). 

It is basically available in different colorations (dark gray to white) and as compacted quality .

It is typically used in high-strength standard concrete (high performance concrete) as an additive (eg acc. to DIN EN 13263), in UHPC (Ultra High Performance Concrete) concrete or wall plaster.

Silica particles are about 30 to 100 times smaller than cement grains and are made almost entirely of amorphous silicon dioxide (SiO2). Here they fill a portion of the pore space and support through a pozzolanic secondary reaction and support the increase in strength. By improving the microstructure, depending on the individual application, surfaces appear even smoother.

In addition, the corrosion protection for the reinforcement, or the resistance to water penetration can be improved.

It also finds use in the fields of refractory materials, granulated fertilizer (coating), and in the manufacture of plastics and adhesives.



In paper sacks of 25 kg or 500 kg big bags. 



Store dry and frost-free.



Available in limited quantities normally in stock.

Name: Silica Fume, gray, uncompacted
EC-Name: Fumes, silica
IUPAC Bezeichnung: Silicon dioxide, amorphous
Chemische Formel: SiO2
Molekulare Formel: O2Si
CAS-Nr: 69012-64-2
EC-Nr.: 273-761-1

Product Manager

Herr Matthias Fischer

Telefon: +49 40 414013-34



EC-Name: Fumes, silica

EC-Nr.: 273-761-1

CAS-Nr: 69012-64-2

Tropag Oscar H. Ritter Nachf. GmbH
Bundesstraße 4, 20146 Hamburg
+49 40 414013-34
Herr Matthias Fischer