Hydrophilic Fumed Silica, Silicone Fluids, Silicone Polymer, Silicone Rubber, Silicone Resins

Fumed Silica - Hydrophilic Fumed Silica

SiSiB® FS-0150 Fumed Silica

Composition

SiSiB® FS0150 is a hydrophilic fumed silica with a specific surface area of 150 m²/g.

Introduction

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.

All untreated fumed silicas are characterized by:

High purity
Aggregated structure
Submicron particle size
Low bulk density
Hydrophilic surface

Typical Physical Properties

CAS No.:	112945-52-5 or 7631-86-9
EINECS No.:	231-545-4
Specific surface area (BET):	150 +/- 15m²/g
Average primary particle size:	5~40 nm
SiO₂ content, wt. %	> 99.8% (based on the substance heated at 1000°C for 2 h)
Loss on drying, ex works, wt. %	<1.0% (2h at 105°C)
Ignition loss (1000°C / 2h), wt.%	<1.0% (based on the substance dried at 105°C for 2 h)
pH value	3.6~4.3 (In 4% aqueous dispersion)
Tamped density	~50g/l

Applications

SiSiB® FS-0150 can be applied as a thickening and thixotropic agent in silicone sealants.

SiSiB® FS-0150 can be used as a reinforcing filler in elastomers, mainly silicone elastomers.

Packing and Storage

SiSiB® FS-0150 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.

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