Evonik AEROSIL R812 is a hydrophobic fumed silica imported from Germany, surface-modified with HMDS. It is designed for efficient rheology control in complex polar systems, featuring strong hydrophobicity, high transparency and easy dispersion, widely used in coatings, adhesives, silicone rubber and other fields.
Strong hydrophobic modification - Treated with HMDS, excellent hydrophobicity, stable in humid and aqueous environments
Precise rheology control - Efficiently adjusts viscosity in 2K epoxy, PU and other complex systems, anti-sagging and anti-settling
High transparency & low haze - Outstanding transparency, no impact on clear coats and light-colored coatings, suitable for high-end finishes
Pigment stabilization & enhancement - Improves pigment dispersion and storage stability, enhances coating anti-corrosion effect
Powder flow optimization - Improves flow in powder coatings, prevents caking, enhances spraying performance
Industrial coatings & automotive paints - 2K PU, epoxy systems, rheology control, anti-settling, anti-corrosion and transparency improvement
Adhesives & sealants - Controls thixotropy, prevents sagging, enhances bonding strength and application performance
Silicone rubber products - Improves mechanical and optical properties, increases strength and light transmittance
Powder coatings - Used as flow aid, anti-caking, improves powder transfer and surface uniformity
Inks & color pastes - Stabilizes pigments, anti-settling, optimizes printing fluency and color performance
| Brand | Evonik |
| Product Series | AEROSIL Hydrophobic Fumed Silica |
| Product Type | Hydrophobic Fumed Silica (White Carbon Black) |
| Surface Treatment | HMDS (Hexamethyldisilazane) |
| BET Surface Area | 220±25 m²/g |
| Bulk Density | approx. 50 g/L |
| pH Value | 3.7–4.7 |
| SiO₂ Content | ≥99.8% |
| CAS Number | 68909-20-6 |
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