What is hydrophilic pyrogenic silica?

Vitro Minerals&#; RS-50 Pyrogenic Silica is a 100% recycled synthetic, hydrophilic, fully X-ray amorphous silica, produced via flame hydrolysis. It is a white, submicron-sized powder of high purity and a surface area of 20-50 m2/g. The primary particles, sized between 60 and 300 nm (0.06-0.3 μm), are spherical and form loosely agglomerated micro-clusters up to about 3 μm.

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RS-50 is effective as a thickening and thixotropic rheology control agent in many polymer systems, such as adhesives, coatings, sealants, printing inks, unsaturated polyesters, cosmetics, etc. It can be used as an active reinforcing filler in elastomers and silicone-elastomers. RS-50 is also effective as a flow aid additive in the production of industrial mineral powders.

Product Uses
Pyrogenic silica powder for use as a filler, flow aid, and other applications in various industries.

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Hydrophilic HDK® Grades

Hydrophilic HDK® is manufactured by the hydrolysis of 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, and can be dispersed in, water.

HDK® Hydrophobic Grades

Hydrophobic HDK® is produced by the chemical reaction of hydrophilic HDK® with reactive silanes, e.g. chlorosilanes or hexamethyldisilazane. Hydrophobic silica has water-repellent properties and is not dispersible in water.

For more information, please visit hydrophobic colloidal silica.