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

Evonik AEROSIL R805 Hydrophobic Fumed Silica

Evonik AEROSIL R805 is a hydrophobic fumed silica imported from Germany, based on A200 modified with octylsilane. Designed for rheology control in complex liquid systems, it features strong hydrophobicity, high dispersion, anti-settling and anti-corrosion, widely used in coatings, adhesives, powder coatings and other high-end systems.

Features Of Evonik AEROSIL R805 Hydrophobic Fumed Silica

  1. Octylsilane hydrophobic modification - Uniform surface modification, stable hydrophobicity, suitable for strong polar and complex chemical systems

  2. Efficient rheology control - Precisely adjust thixotropy in complex liquid systems such as two-component epoxy, anti-sagging and anti-settling

  3. Pigment stabilization and enhancement - Improve pigment dispersion and storage stability, enhance coating anti-corrosion and weather resistance

  4. Powder coating flow aid - Improve powder fluidity, prevent caking, enhance spraying uniformity and powder transfer efficiency

  5. High purity and low impurity - SiO₂ content ≥99.8%, stable batch, compatible with various resins

Typical Applications Of Evonik AEROSIL R805 Hydrophobic Fumed Silica

  1. Two-component epoxy coatings - Rheology control for complex systems, anti-sagging, anti-settling, improve anti-corrosion and appearance

  2. Industrial coatings and topcoats - Improve pigment stability, workability, weather resistance and anti-corrosion

  3. Adhesives and sealants - Optimize thixotropy, prevent sagging, improve bonding strength and water resistance

  4. Powder coatings - Used as flow aid, improve fluidity and spraying efficiency

  5. Unsaturated resin systems - Enhance thickening effect and system stability, extend pot life

Specifications Of Evonik AEROSIL R805 Hydrophobic Fumed Silica

BrandEvonik
Product SeriesAEROSIL Hydrophobic Fumed Silica
Product TypeHydrophobic Fumed Silica
Base MaterialA200 Hydrophilic Fumed Silica
Surface TreatmentOctylsilane
BET Surface Area150±25 m²/g
Bulk DensityApprox. 50 g/L
Carbon Content4.5–6.5 wt%
Moisture Content≤0.5 wt%
Loss on Ignition5.0–7.0 wt%



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