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® FS0150 can be applied as a thickening and thixotropic agent in silicone sealants.
SiSiB® FS0150 can be used as a reinforcing silicone filler in elastomers, mainly silicone elastomers.
SiSiB® FS0150 hydrophilic fumed silica is supplied in multiple layer 10 kg bags.
In the original unopened packaging, SiSiB® FS-0150 has a shelf life of 24 months under dry conditions.