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

WACKER Hydrophobic Fumed Silica HDK H13L

WACKER HDK H13L is a DDS-treated hydrophobic fumed silica (150 m²/g BET, 14nm) produced via flame hydrolysis. This high-purity white powder enhances rheology in polar systems like epoxy/polyurethane coatings and silicone sealants, while improving texture in cosmetics

Features Of WACKER Hydrophobic Fumed Silica HDK H13L

  1. Surface Modification: Dimethylsiloxy groups ensure permanent hydrophobicity (pH 3.8-4.3)

  2. Rheology Control: Reduces pigment settling by 50% in solvent-based coatings

  3. Thermal Stability: Maintains performance up to 300°C in HTV silicone rubber

  4. Low Moisture:<0.6% water content (105°C) for storage stability

  5. Food/Grade Compliance: Not suitable for pharmaceuticals/food (non-GRAS)

Typical Applications Of WACKER Hydrophobic Fumed Silica HDK H13L

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

  2. Silicone Sealants: Thixotropy enhancer in RTV-1K formulations

  3. Cosmetics: Texture modifier in lipsticks/sunscreens (INCI: Silica Dimethyl Silylate)

  4. Printing Inks: Flow control agent for flexographic inks

Specifications Of WACKER Hydrophobic Fumed Silica HDK H13L

Silica Content
DIN EN ISO 3262-19
%
>99.8
Silica Density
-
g/l
2200
Silanol Group Density
-
SiOH/nm²
1
Resistivity (density 40g/l)
-
[Ω cm]
>10^13
BET Surface Area (Hydrophobic Fumed Silica)
DIN ISO 9277/DIN 66132
m²/g
ca.120



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