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

Evonik AEROSIL R812 Hydrophobic Fumed Silica

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.

Features Of Evonik AEROSIL R812 Hydrophobic Fumed Silica

  1. Strong hydrophobic modification - Treated with HMDS, excellent hydrophobicity, stable in humid and aqueous environments

  2. Precise rheology control - Efficiently adjusts viscosity in 2K epoxy, PU and other complex systems, anti-sagging and anti-settling

  3. High transparency & low haze - Outstanding transparency, no impact on clear coats and light-colored coatings, suitable for high-end finishes

  4. Pigment stabilization & enhancement - Improves pigment dispersion and storage stability, enhances coating anti-corrosion effect

  5. Powder flow optimization - Improves flow in powder coatings, prevents caking, enhances spraying performance

Typical Applications Of Evonik AEROSIL R812 Hydrophobic Fumed Silica

  1. Industrial coatings & automotive paints - 2K PU, epoxy systems, rheology control, anti-settling, anti-corrosion and transparency improvement

  2. Adhesives & sealants - Controls thixotropy, prevents sagging, enhances bonding strength and application performance

  3. Silicone rubber products - Improves mechanical and optical properties, increases strength and light transmittance

  4. Powder coatings - Used as flow aid, anti-caking, improves powder transfer and surface uniformity

  5. Inks & color pastes - Stabilizes pigments, anti-settling, optimizes printing fluency and color performance

Specifications Of Evonik AEROSIL R812 Hydrophobic Fumed Silica

BrandEvonik
Product SeriesAEROSIL Hydrophobic Fumed Silica
Product TypeHydrophobic Fumed Silica (White Carbon Black)
Surface TreatmentHMDS (Hexamethyldisilazane)
BET Surface Area220±25 m²/g
Bulk Densityapprox. 50 g/L
pH Value3.7–4.7
SiO₂ Content≥99.8%
CAS Number68909-20-6


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