Hydrophilic fumed silica is manufactured by hydrolysing volatile chlorosilanes in an oxyhydrogen flame. In chemical terms, the loose white powder consists of highly pure amorphous silicon dioxide.
Hydrophilic silica is wetted by water and can be dispersed in water. Hydrophobic silica is produced by the chemical reaction of hydrophilic silica with reactive silanes, e.g. chlorosilanes or hexamethyldisilazane. It has water-repellent properties and is no longer dispersible in water.
112945-52-5 or 7631-86-9
601-216-3 or 231-545-4
Specific surface area (BET)
Average primary particle size
SiO2 content, wt.% (1000°C, 2h)
Loss on drying, (105°C, 2h) wt.%
Ignition loss (1000°C, 2h), wt.%
pH-Value (in 4 % aqueous dispersion)
SiSiB® FS0300 can be applied as a thickening and thixotropic agent in many organic systems, e.g. in unsaturated polyesters, coatings, printing inks, silicone adhesives and sealants.
SiSiB® FS0300 is used as a reinforcing filler for HTV and LSR at a high transparency level.
SiSiB® FS0300 sio2 hydrophilic is supplied in multiple layer 10 kg bags.
In the original unopened packaging, SiSiB® FS0300 has a shelf life of 24 months under dry conditions.