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

WACKER Hydrophilic Fumed Silica HDK N20ST

WACKER HDK N20ST is a hydrophilic fumed silica (175-225 m²/g BET) produced via flame hydrolysis. It acts as a thixotropic agent in coatings and adhesives while providing anti-settling effects, though unsuitable for food/pharmaceutical use due to industrial-grade purity

Features Of WACKER Hydrophilic Fumed Silica HDK N20ST

  1. High Purity: >99.8% SiO₂ content with <1.5% moisture (105°C)

  2. Rheology Control: Reduces pigment settling by 50% in solvent systems

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

  4. Low Residue: <0.03% sieve residue (>40μm) for uniform dispersion

  5. Thermal Resistance: Stable up to 300°C in silicone elastomers

Typical Applications Of WACKER Hydrophilic Fumed Silica HDK N20ST

  1. Industrial Coatings: Anti-sagging agent for epoxy/polyurethane systems

  2. Silicone Sealants: RTV-1K thickening and storage stability enhancer

  3. Printing Inks: Rheology modifier for flexographic/offset inks

  4. Cable Gels: Dielectric performance improver in insulation materials

Specifications Of WACKER Hydrophilic Fumed Silica HDK N20ST

BET - Surface Area
DIN 66131
m²/g
170 - 230
pH of 4% Dispersion
DIN ISO 787/9
-
3.8 - 4.3
Filling Density
DIN ISO 787/11
g/l
approx. 40
Loss on Drying (105℃, 2h)
DIN ISO 787/2
%
<1.5
Sieve Residue (according to Mocker >40μm)
DIN ISO 787/18
%
<0.04



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