Our system has noticed that you are based in United States, but the current country setting is South Africa. Do you still want to change your country?

Pyrogenic Silica

HDK® pyrogenic silica is a light, bulky white powder. Thanks to our integrated production system with statistical process control and highly efficient reactor dynamics, we produce pyrogenic silica of exceptional purity. Pyrogenic silica from WACKER is an excellent insulator for electrical current and thermal energy. The special feature of all pyrogenic silicas is their large specific surface area: 18 grams of a typical pyrogenic silica covers an area the size of a soccer pitch.

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 made by chemically modifying hydrophilic HDK® with reactive silanes, silazanes or siloxanes. Hydrophobic pyrogenic silica has water-repellent properties and is no longer dispersible in water. It is particularly suitable as a rheological additive in polar polymer matrix systems.

Product Recommendations

Products
Technical data
BET surface
HDK® D05 35 - 65 m²/g[1] 35 - 65 m²/g[1]
HDK® H13L approx. 110 m²/g[2] approx. 110 m²/g[2]
HDK® H15 approx. 120 m²/g[2] approx. 120 m²/g[2]
HDK® H17 approx. 90 m²/g[2] approx. 90 m²/g[2]
HDK® H18 approx. 120 m²/g[2] approx. 120 m²/g[2]
HDK® H20 approx. 170 m²/g[2] approx. 170 m²/g[2]
HDK® H2000 approx. 200 m²/g[3] approx. 200 m²/g[3]
HDK® H30 approx. 250 m²/g[2] approx. 250 m²/g[2]
HDK® I13 - -
HDK® N20 175 - 225 m²/g[1] 175 - 225 m²/g[1]
HDK® N20 NUTRITION 175 - 225 m²/g[1] 175 - 225 m²/g[1]
HDK® N20 P PHARMA 175 - 225 m²/g[1] 175 - 225 m²/g[1]
HDK® N20 PHARMA 175 - 225 m²/g[1] 175 - 225 m²/g[1]
HDK® N20D 175 - 225 m²/g[1] 175 - 225 m²/g[1]
HDK® N20P 175 - 225 m²/g[1] 175 - 225 m²/g[1]
HDK® N20PLUS 175 - 225 m²/g[1] 175 - 225 m²/g[1]
HDK® N20ST 175 - 225 m²/g[1] 175 - 225 m²/g[1]
HDK® S13 110 - 140 m²/g[1] 110 - 140 m²/g[1]
HDK® T30 270 - 330 m²/g[1] 270 - 330 m²/g[1]
HDK® T30P 270 - 330 m²/g[1] 270 - 330 m²/g[1]
HDK® T30PLUS 270 - 330 m²/g[1] 270 - 330 m²/g[1]
HDK® T40 360 - 440 m²/g[1] 360 - 440 m²/g[1]
HDK® V15 130 - 170 m²/g[1] 130 - 170 m²/g[1]
HDK® V15A 130 - 170 m²/g[1] 130 - 170 m²/g[1]
HDK® V15D 130 - 170 m²/g[1] 130 - 170 m²/g[1]
HDK® V16 130 - 170 m²/g[1] 130 - 170 m²/g[1]
HDK® V16D 130 - 170 m²/g[1] 130 - 170 m²/g[1]
Legend
[1] BET surface | DIN ISO 9277 DIN 66132,  [2] BET surface | DIN ISO 9277 DIN 66132 | of the hydrophobic silica,  [3] BET surface | DIN ISO 9277 DIN 66132 | area of hydrophilic silica