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

WACKER Hydrophobic Fumed Silica HDK H30

WACKER HDK  H30 is a hydrophobic fumed silica (200±20 m²/g) for polar resin systems. This rheology modifier enhances viscosity and thixotropy in epoxy/polyurethane formulations while improving mechanical strength in silicone rubbers.

Features Of WACKER Hydrophobic Fumed Silica HDK H30

  1. Surface Area: 200±20 m²/g BET for precise rheology control

  2. Thermal Stability: Maintains performance up to 300°C

  3. Hydrophobicity: Treated with organosilanes for water resistance

  4. Reinforcement: Increases HTV silicone tensile strength by 35%

Typical Applications Of WACKER Hydrophobic Fumed Silica HDK H30

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

  2. Silicone Products: Reinforcing filler for HTV rubber

  3. Adhesives: Thixotropy modifier in structural adhesives

  4. Cable Gels: Dielectric enhancer in insulation materials

Specifications Of WACKER Hydrophobic Fumed Silica HDK H30

Silica Content
Method: DIN EN ISO 3262-19
Unit: %
Value: >99.8
Silica Density
Method:
Unit: g/l
Value: 2200
Silanol Group Density
Method:
Unit: SiOH/nm²
Value: 2
BET Surface Area (Hydrophobic Fumed Silica)
Method: DIN ISO 9277/DIN 66132
Unit: m²/g
Value: Approx. 250
[Physicochemical Performance Table]



BET Surface Area (Hydrophilic Fumed Silica)
Method: DIN ISO 9277/DIN 66132
Unit: m²/g
Value: 270 - 330
Carbon Content
Method:
Unit: %
Value: ca. 1.4 - 2.6
pH of 4% Dispersion
Method: DIN EN ISO 787-9
Unit:
Value: 3.8 - 4.8
Bulk Density
Method: DIN EN ISO 787-11
Unit: g/l
Value: ca. 40
Loss on Drying (105℃, 2h)
Method: DIN EN ISO 787-2
Unit: %
Value: <0.6
Residual Amount (according to Mocker >40μm)
Method: DIN EN ISO 787-18
Unit: %
Value: <0.05
Surface Modification
Method:
Unit:
Value: OSi(CH₃)₂-


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