WACKER HDK N20D is a hydrophilic fumed silica (175-225m²/g BET) produced via flame hydrolysis. This high-purity colloidal powder enhances flowability and prevents caking in unsaturated polyesters, coatings, and cosmetics, though it is unsuitable for pharmaceuticals or food applications
High Purity: >99.8% SiO₂ content with low moisture (<1.5%)
Rheology Control: Acts as a thickening/thixotropic agent in organic systems
Fast Incorporation: Higher bulk density vs. non-densified grades for quicker mixing
pH Stability: 3.8-4.3 in 4% aqueous dispersion (DIN EN ISO 787-9)
Coatings/Inks: Anti-settling agent in solvent-based formulations
Adhesives: Improves viscosity stability in sealants
Cosmetics: Flow enhancer in personal care products (INCI: Silica)
Industrial Resins: Thickener for unsaturated polyesters
Silica Content | DIN EN ISO 3262-19 | >99.8% |
Loss on Ignition | DIN EN ISO 3262-19 | <2% |
Silica Density | DIN 51757 | Approximately 2.2g/cm³ |
Refractive Index | - | 1.46 |
Silane Alcohol Group Density | - | 2 SiOH/nm² |
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