AEROSIL® R 812
Fumed silica
AEROSIL® R 812 is a fumed silica post-treated with organosilane (HMDS) and a high specific surface area combined with exceptional hydrophobicity.
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0AEROSIL® R 812 is a fumed silica post-treated with organosilane (HMDS) and a high specific surface area combined with exceptional hydrophobicity.
Description
AEROSIL® R 812 is a fumed silica post-treated with organosilane (HMDS — hexamethyldisilazane), combining a high specific surface area with exceptional hydrophobicity. Compared with the D4-treated AEROSIL® R 106, the HMDS treatment on R 812 makes it especially effective in solventborne and two-component polyurethane (2K PU) systems, providing efficient thickening at low addition levels.
R 812 disperses to a high level of transparency, which is why it is especially recommended for automotive clear coats — where rheology control is needed without introducing haze into the finish.
Need to compare this model with other grades? Read our full AEROSIL® fumed silica grade comparison guide to choose the right hydrophilic or hydrophobic fumed silica for your formulation.
Key Benefits
Highly efficient — strong thickening effect at low addition levels
High transparency — especially recommended for automotive clear coats
Highly recommended for two-component polyurethane (2K PU) systems
AEROSIL® R 812 is rated for the following coating performance effects: anti-settling, anti-sagging, and corrosion resistance. See the technical data sheet for detailed performance ratings.
Typical Application
• General industrial coatings
• Car OEM coating
• Marine coatings
Technical Data
| losson drying | pH-value | SiO2 content | specific surfacearea(BET) | tamped density |
| <0.5 % | 5.5-8.0 | >99.8 % | 230 - 290 m²/g | Approx. 60 g/l |
Technical Data
| Properties and Test Methods | Value |
| Carbon content | 2%-3% |
| Losson drying | <0.5 % |
| PH-value | 5.5-8.0 |
| SiO2 content | >99.8 % |
Specific surfacearea(BET) | 230 - 290 m²/g |
Tamped density | Approx. 60 g/l |
Need the full PDS and MSDS? Contact our sales team to request the latest documents.
We cooperate with multiple well-known domestic suppliers
Our products have passed various industry certifications
