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

WACKER Hydrophilic Fumed Silica HDK N20D

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

Features Of WACKER Hydrophilic Fumed Silica HDK N20D

  1. High Purity: >99.8% SiO₂ content with low moisture (<1.5%)

  2. Rheology Control: Acts as a thickening/thixotropic agent in organic systems

  3. Fast Incorporation: Higher bulk density vs. non-densified grades for quicker mixing

  4. pH Stability: 3.8-4.3 in 4% aqueous dispersion (DIN EN ISO 787-9)

Typical Applications Of  WACKER Hydrophilic Fumed Silica HDK N20D

  1. Coatings/Inks: Anti-settling agent in solvent-based formulations

  2. Adhesives: Improves viscosity stability in sealants

  3. Cosmetics: Flow enhancer in personal care products (INCI: Silica)

  4. Industrial Resins: Thickener for unsaturated polyesters

Specifications Of WACKER Hydrophilic Fumed Silica HDK N20D

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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