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
Rheology Optimization: Balances thixotropy and leveling in high-polarity coatings (tested at 0.9% loading)
Optical Clarity: Maintains >95% transparency in clear coats
Thermal Stability: Stable up to 300°C in silicone rubber
Surface Modification: Trimethylsiloxy groups ensure hydrophobicity (pH 6.5)
Storage Stability: Retains rheological properties after 30-day storage
Automotive Coatings: Crater-free clear coats for OEM finishes
Industrial Paints: Anti-sagging agent for epoxy/PU systems
Adhesives: Thixotropy modifier in wind turbine half-shell bonding
Printing Inks: Rheology adjuster for gravure/flexo inks
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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