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

WACKER Hydrophobic Fumed Silica HDK H30LM

WACKER HDK H30LM is a hydrophobic fumed silica (220 m²/g BET) for polar resin systems like epoxy/polyurethane. It provides superior rheology control and transparency in automotive clear coats, while being PDMS-free to prevent cratering

Features Of WACKER Hydrophobic Fumed Silica HDK H30LM

  1. Rheology Optimization: Balances thixotropy and leveling in high-polarity coatings (tested at 0.9% loading)

  2. Optical Clarity: Maintains >95% transparency in clear coats

  3. Thermal Stability: Stable up to 300°C in silicone rubber

  4. Surface Modification: Trimethylsiloxy groups ensure hydrophobicity (pH 6.5)

  5. Storage Stability: Retains rheological properties after 30-day storage

Typical Applications Of WACKER Hydrophobic Fumed Silica HDK H30LM

  1. Automotive Coatings: Crater-free clear coats for OEM finishes

  2. Industrial Paints: Anti-sagging agent for epoxy/PU systems

  3. Adhesives: Thixotropy modifier in wind turbine half-shell bonding

  4. Printing Inks: Rheology adjuster for gravure/flexo inks

Specifications Of WACKER Hydrophobic Fumed Silica HDK H30LM

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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