Pyrogenic Fumed Silica:

Fumed Silica - General Brochure
Fumed Silica - Product Overview

 

Authorized Distributor:
National

WACKER has been producing fumed silica (HDK®) since 1968 and has developed a high level of expertise in this field.

HDK® is produced by the introduction of volatile chlorosilanes into a oxyhydrogen flame. Chemically, fumed silica consists of ultrapure amorphous silicon dioxide and has the appearance of a light white powder.

HDK® is used as an active filler in silicone elastomers, as a thixotropic agent in coatings, printing inks, adhesives, UP resins and plastisols or as a flow aid, for example in the cosmetics, pharmaceutical and food-processing industries.

Hydrophilic Wacker Code	BET Surface Area (m2/g)
HDK® S13	110 - 140
HDK® V15	130 - 170
HDK® V15P	130 - 170
HDK® N20	170 - 230
HDK® N20P	170 - 230
HDK® N20ST	170 - 230
HDK® T30	270 - 330
HDK® T40	360 - 440

Hydrophobic Wacker Code	BET Surface Area (m2/g)
HDK® H15	130 - 170
HDK® H18	170 - 230
HDK® H2000	170 - 230
HDK® H20RM	170 - 230
HDK® H30	270 - 330
HDK® H30RM	270 - 330

Hydrophilic HDK® is produced by the introduction of volatile chlorosilanes into an oxyhydrogen flame. Chemically, fumed silica consists of ultrapure amorphous silicon dioxide and has the appearance of a light white powder. Hydrophilic fumed silica is wetted by water and also disperses in water.

Hydrophilic HDK® is used as a thixotropic agent in coatings, printing inks, adhesives, UP resins, plastisols, or as a flow aid, for example in the cosmetics, pharmaceutical and food-processing industries.

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

Hydrophobic HDK® is used as an active filler in silicone elastomers, as a thixotropic agent in coatings, printing inks, adhesives, as well as in polar epoxy, vinyl ester or polyurethane resins.