Silico® Hydrophobic Fumed Silica

Silico® hydrophobic fumed silica is made by chemically treating hydrophilic fumed silica with reactive silanes or silicone oils, such as chlorosilanes, HMDS, or PDMS. This treatment gives the silica excellent water repellency, making it non-dispersible in water.

Silico® hydrophobic silica is widely used in silicone adhesives and sealants, silicone elastomers, coatings, inks, composites, personal care products, and fire extinguishers. It helps control rheology (thickening, anti-sagging, anti-settling, thixotropy) and enhances strength.

In polar systems like isocyanate, epoxy, silicone, polyurethane, and vinyl ester resins, Silico® hydrophobic silica offers strong thixotropic effects and reinforcement without excessive thickening.

It also improves water resistance in cosmetics and enhances powder flowability. Silico® products provide excellent storage stability and are effective as anti-settling and anti-sagging agents for pigments.

Recommended Hydrophobic Fumed Silica

FS2110 Hydrophobic Fumed Silica

Silico® FS2110 is a hydrophobic fumed silica treated with polydimethylsiloxane. It enhances thickening, reinforcement, and flow in silicone rubber, epoxy resins, and clear systems.

FS2110 Hydrophobic Fumed Silica

Silico® FS5115 is a hydrophobic fumed silica treated with DDS, derived from hydrophilic silica with a 150 m²/g surface area, offering excellent thickening and reinforcement.

FS2110 Hydrophobic Fumed Silica

Silico® FS5170 is a hydrophobic fumed silica treated with DDS, derived from hydrophilic silica with a 200 m²/g surface area, providing excellent thickening and reinforcement.

FS9120 Hydrophobic Fumed Silica

Silico® FS9120 is a high-purity hydrophobic fumed silica treated with HMDS, derived from hydrophilic silica with a 150 m²/g surface area. It is a white colloidal powder.

FS9150 Hydrophobic Fumed Silica

Silico® FS9150 is a high-purity hydrophobic fumed silica treated with HMDS, derived from hydrophilic silica with a 150 m²/g surface area. It is a white powder.

FS9150 Hydrophobic Fumed Silica

Silico® FS9160 is a hydrophobic fumed silica treated with HMDS (Hexamethyldisilazane). It is a structure-modified hydrophobic silica, offering enhanced performance.

FS9170 Hydrophobic Fumed Silica

Silico® FS9170 is a high-purity hydrophobic fumed silica treated with HMDS, derived from hydrophilic silica with a 200 m²/g surface area. It is a white colloidal powder.

FS9210 Hydrophobic Fumed Silica

Silico® FS9210 is a hydrophobic fumed silica treated with HMDS (Hexamethyldisilazane), offering enhanced performance and stability.

FS2111 Hydrophobic Fumed Silica

Silico® FS2111 is a polydimethylsiloxane-treated hydrophobic silica, offering excellent thickening, thixotropy, and stability.

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How to Choose Hydrophobic Fumed Silica

Selecting the right hydrophobic fumed silica depends on key factors:

Surface Treatment: The treatment (e.g., HMDS, DDS, PDMS) affects hydrophobicity, dispersion, and compatibility. For example, HMDS-treated silica is great for polar systems, while PDMS-treated silica enhances thixotropy.
Particle Size & Surface Area: Smaller particles with higher surface areas provide better thickening and reinforcement.
Polarity Compatibility: Choose silica that matches your system’s polarity for better dispersion and performance in systems like epoxy and polyurethane.
Application Needs: Determine if you need thickening, anti-sagging, or reinforcement. Silico® FS2110 excels in thixotropic behavior.

By considering these factors, you can choose the best hydrophobic fumed silica for your needs.