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https://www.gysilica.com/recommended-products/hydrophobic-colloidal-silica.html          
 
Hydrophobic colloidal silica                refers to silica nanoparticles that have been chemically modified to repel water. Colloidal silica consists of tiny particles of silicon dioxide suspended in a liquid. These particles are so small that they remain dispersed rather than settling out of solution.     
 
Applications
Coatings and paints: Hydrophobic colloidal silica                can be used as an additive to improve the water resistance and durability of coatings and paints. It helps prevent moisture from penetrating the surface, thereby enhancing the protective properties of the coating.     
 
Rheology modifiers: Hydrophobic colloidal silica can be incorporated into various formulations to control rheological properties such as viscosity and thixotropy. This is particularly useful in industries such as cosmetics, adhesives, and printing inks.     
 
Catalyst supports: Hydrophobic colloidal silica can serve as a support material for catalysts in chemical reactions. The hydrophobic surface helps prevent unwanted interactions with water, allowing the catalyst to remain active for longer periods.     
 
Pharmaceuticals: Hydrophobic colloidal silica may be used in pharmaceutical formulations to improve drug stability, control release rates, and enhance bioavailability.     

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