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
Surface Modification: Dimethylsiloxy groups ensure permanent hydrophobicity (pH 3.8-4.3)
Rheology Control: Reduces pigment settling by 50% in solvent-based coatings
Thermal Stability: Maintains performance up to 300°C in HTV silicone rubber
Low Moisture:<0.6% water content (105°C) for storage stability
Food/Grade Compliance: Not suitable for pharmaceuticals/food (non-GRAS)
Industrial Coatings: Anti-sagging agent for high-solids epoxy systems
Silicone Sealants: Thixotropy enhancer in RTV-1K formulations
Cosmetics: Texture modifier in lipsticks/sunscreens (INCI: Silica Dimethyl Silylate)
Printing Inks: Flow control agent for flexographic inks
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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