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

WACKER Hydrophilic Fumed Silica HDK S13

WACKER HDK S13 is a hydrophilic fumed silica (110-140 m²/g BET) produced via flame hydrolysis. It acts as a thixotropic agent in silicone sealants and reinforcing filler in elastomers, while enhancing rheology in coatings and inks. Not suitable for food/pharmaceutical use

  • wacker hdk s13
  • wacker hdk s13

Features Of WACKER Hydrophilic Fumed Silica HDK S13

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

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

  3. Silicone Reinforcement: Boosts HTV rubber tensile strength by 30%

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

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

Typical Applications Of WACKER Hydrophilic Fumed Silica HDK S13

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

  2. Industrial Coatings: Anti-sagging in epoxy/polyurethane paints

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

  4. Cable Gels: Dielectric enhancer in insulation materials

Specifications Of  WACKER Hydrophilic Fumed Silica HDK S13

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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