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

WACKER Hydrophilic Fumed Silica HDK N20P

Leveraging advanced thermo-mechanical properties, Wacker HDK N20P is a mechanically densified hydrophilic fumed silica with 175-225 m²/g surface area and ≥99.8% SiO₂ purity. Its compressed white powder form (100 g/L bulk density, 150% higher than N20) reduces dust emission by 70%, ideal for electronic encapsulation and high-performance coatings with pH 3.8-4.3

Features Of WACKER Hydrophilic Fumed Silica HDK N20P

  1. Density Advantage: 50% smaller packaging volume cuts logistics costs by 40%

  2. Thixotropic Control: 1-3% dosage in epoxy achieves thixotropic index 3.5 (ASTM D2196), +60% anti-sagging

  3. Low-Dust Process: 70% less airborne particles for cleanroom compliance

  4. Broad Compatibility: Stable in solvent/solvent-free systems with silicones/PU

  5. Long-Term Stability: No caking after 24 months at 50℃, <1.5% ignition loss

Typical Applications Of WACKER Hydrophilic Fumed Silica HDK N20P

  1. Electronic Encapsulation: Eliminates voids in high-viscosity epoxy (>100,000 mPa·s), thermal conductivity ≥0.8 W/m·K

  2. Industrial Coatings: Powder coating flow aid (0.5-1.5%), +20% spraying efficiency

  3. Adhesives: UV-curable glue thixotropy, +30% shear strength

  4. Composites: Prevents settling in CFRP prepreg, 95% fiber uniformity

Specifications Of WACKER Hydrophilic Fumed Silica HDK N20P

Chemical TypeHydrophilic fumed silica
AppearanceWhite nano powder
Surface Area (BET)175-225 m²/g
Primary Particle Size7-40 nm
Bulk Density100 g/L
SiO2 Content≥99.8%
pH (4% aqueous)3.8-4.3
Ignition Loss (1000℃)<1.5%
Moisture Content<1.5%
Packaging20kg/moisture-proof bag (pallet)


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