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

Evonik AEROSIL R812S Hydrophobic Fumed Silica

Evonik AEROSIL R812S is a hydrophobic fumed silica imported from Germany, post-treated with HMDS (Hexamethyldisilazane) from A300. Designed for rheology control in complex liquid systems, it has high transparency, strong anti-corrosion and easy processing, suitable for coatings, adhesives, silicone rubber and other fields.

Features Of Evonik AEROSIL R812S Hydrophobic Fumed Silica

  1. Efficient rheology control - Precisely controls flow in complex liquid systems such as two-component epoxy, strongly anti-sagging and anti-settling, ensuring uniform construction

  2. High-quality hydrophobic modification - Professionally treated with HMDS, stable hydrophobicity, suitable for multiple systems, improving product water resistance, moisture resistance and storage stability

  3. High transparency and wide adaptability - Excellent transparency, especially suitable for automotive clear coats and high-end coatings, without affecting product appearance and optical performance

  4. Pigment stabilization and enhancement - As an anti-settling agent, it improves pigment dispersion stability, enhances coating anti-corrosion effect and extends service life

  5. Multifunctional adaptation - It has both powder flow aid and silicone rubber reinforcement effects, easy to add, good compatibility, and suitable for multi-industry processing needs

Typical Applications Of Evonik AEROSIL R812S Hydrophobic Fumed Silica

  1. Coating systems - Automotive OEM paint, industrial paint, marine paint, flow control and anti-settling, enhance anti-corrosion, improve coating texture and durability

  2. Adhesives and sealants - Control thixotropy, prevent sagging, enhance bonding strength and water resistance, adapt to multi-scenario sealing needs

  3. Silicone rubber products - Improve mechanical and optical properties, optimize product strength and light transmittance, suitable for high-end silicone rubber formulations

  4. Powder coatings - Used as a flow aid, improve powder fluidity, anti-caking, enhance spraying uniformity and powder transfer efficiency

  5. Radiation curing systems - Suitable for UV and other radiation curing scenarios, flow control and anti-sagging, ensuring stable appearance and performance of cured products

Specifications Of Evonik AEROSIL R812S Hydrophobic Fumed Silica

BrandEvonik
Product SeriesAEROSIL Hydrophobic Fumed Silica
Product TypeHydrophobic Fumed Silica
Surface Treatment AgentHMDS (Hexamethyldisilazane)
Raw Material BaseA300 Fumed Silica
BET Surface Area195-245 m²/g
Carbon Content3.0-4.0 wt%
Loss on Drying<0.5 wt%
pH Value5.5-9.0
SiO₂ Content>99.8 wt%


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