Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

WACKER Hydrophobic Fumed Silica HDK H17

WACKER HDK  H17 is a hydrophobic fumed silica (150±20 m²/g) for polar systems. It provides superior thickening and thixotropy in epoxy/polyurethane formulations while enhancing mechanical properties in silicone rubbers and composites.

Features Of WACKER Hydrophobic Fumed Silica HDK H17

  1. Surface Area: 150±20 m²/g BET for precise rheology control

  2. Thermal Stability: Maintains performance up to 280°C

  3. Hydrophobicity: Organosilane-treated for water resistance

  4. Reinforcement: Improves HTV silicone tensile strength by 30%

  5. Low Moisture:<0.7% water content (105°C)

Typical Applications Of WACKER Hydrophobic Fumed Silica HDK H17

  1. Industrial Coatings: Anti-sagging agent for epoxy systems

  2. Silicone Products: Reinforcing filler for HTV rubber

  3. Adhesives: Thixotropy modifier in structural adhesives

  4. Composites: Viscosity stabilizer for unsaturated polyesters

Specifications Of WACKER Hydrophobic Fumed Silica HDK H17

Performance
Method
Unit
Value
Silica content
DIN EN ISO 3262-19
%
>99.8
Silica density
-
g/l
2200
Silanol group density
-
SiOH/nm²
<0.5
Resistivity (density 40g/l)
-
[Ωcm]
>10¹³
BET surface area (hydrophobic fumed silica)
DIN ISO 9277/DIN 66132
m²/g
ca.90
Physical and Chemical Performance Table



Physical and Chemical Properties
Method
Unit
Value
BET surface area (hydrophilic fumed silica)
DIN ISO 9277/DIN 66132
m²/g
130 - 170
Carbon content
-
%
ca.4.5
pH value of 4% dispersion
DIN EN ISO 787-9
-
4.0 - 6.8
Packing density
DIN EN ISO 787-11
g/l
ca.50
Dry weight loss (105°C, 2h)
DIN EN ISO 787-2
%
<0.6
Sieve residue (according to Mocker >40μm)
DIN EN ISO 787-18
%
<0.2
Surface modification
-
-
OSi(CH₃)₂ -


Get in Touch with ERICW
Let competitive chemical materials go global.

Your Name *

Your Email *

Your Phone

Country

Your Message *