Hydrophobic Fumed Silica

Hydrophobic fumed silica is generally a post-treated product. SiSiB hydrophobic silicas is produced by the chemical reaction of hydrophilic silica with reactive silanes or silicone fluids, like chlorosilanes, hexamethyldisilazane and polydimethysiloxane. They have water-repellent properties and are no longer dispersible in water.

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SiSiB fumed silicas are widely used in silicone adhesives & sealants, silicone elastomers, coatings & inks, composites, personal care cosmetics and fire extinguisher. They are used to for rheology control (thickening, anti-sag, anti-setting, thixotropy), reinforcing (improve strength).

Hydrophobic silicas are very effective thixotropic in polar adhesives and sealants like isocyanate resins, epoxy resins, silicone resins, polyurethane resins and vinylester resins. And they can be used for reinforcing silicones without thickening.

Additionally, SiSiB hydrophobic fumed silica improves the water resistance of moisture-sensitive formulations such as cosmetic preparations and flowability of powders.

Also, hydrophobic pyrogenic silica by SiSiB, a reliable silicone manufacturing company, has excellent storage stability and process ability; they are widely used as an anti-settling and anti-sagging agent of pigments. 

More information of our hydrophobic fumed silica for sale, please feel free to contact us.

Hydrophobic fumed silica is prepared by modifying hydrophilic fumed silica by treating agents of HMDS(Hexamethyldisilazane), PDMS(Polydimethylsiloxane), DDS(Dimethyldichlorosilane), or special silane. (Why fumed silica need to be treated to be hydrophobic?)

• Hydrophobic Nature: Repels water molecules; doesn&#;t mix or disperse in water, making it essential for water-resistant applications.
• Rheology Control: Modulates flow properties of liquids; ensures ease of pouring, spreading, or application.
• Thickening Agent: Increases viscosity in polar liquids, ensuring desired consistency and texture in formulations.
• Reinforcing Agent: Adds strength and durability to elastomers, enhancing their performance and lifespan.
• Improves Hydrophobicity: Enhances water resistance, making products less prone to water damage or degradation.
• Corrosion Resistance: Offers a protective layer, preventing materials from corroding, especially when exposed to harsh environments.
• Enhanced Dielectric Performance: Boosts electrical insulating properties, beneficial in electronic applications.
• Improved Scratch Resistance: Provides a protective barrier, reducing the risk of surface scratches and enhancing product durability.

Hydrophobic fumed silica has low polarity, makes it suitable for products of medium or high polarity systems, medium polarity systems products including polyurethane, polyols, polyimide, etc, and high polarity system products such as epoxy resin, vinyl resin, amine substances, cyanoacrylate, isocyanate (e.g., MDI, TDI), and polar solvents (e.g., alcohols, ketones, acetates). Hydrophobic fumed silica is also suitable for some low polarity system products such as MS Polymer, STP-E, polyacrylic acid acetate, polysulfide, etc.

As the differences in the polarity of hydrophobic fumed silica, variations in compatibility with different chemical system products exist, Please check the below table based on their specific product polarities for usage:

Polarity LevelMaterials/ProductsRecommended Fumed SilicaNon-polarity ProductMethyl Organosilicon
PVC (Polyvinyl Chloride)
Aromatic/Aliphatic Hydrocarbons (e.g., Butyl, Styrene)
Non-polar Solvents (e.g., THF &#; Tetrahydrofuran)HIFULL HL-380
HIFULL HL-300
HIFULL HL-200
HIFULL HL-150Low-polarity ProductMS Polymer
STP-E
Polyacrylic Acid Acetate
PolysulfidesHIFULL HB-152
HIFULL HB-151Medium-polarity ProductPolyurethane
Polyols
PolyamidesHIFULL HB-139High-polarity ProductEpoxy Resins
Vinyl Resins
Amine Compounds
Cyanoacrylate
Isocyanates (e.g., MDI, TDI)
Polar Solvents (e.g., Alcohols, Ketones, Acetic Solutions)HIFULL HB-139

Hydrophobic fumed silica possesses low hygroscopicity, excellent dispersibility, and the ability to regulate rheology in polar systems. Some HIFULL hydrophobic fumed silica with post-treatment and structure modification can further assist customers in developing new products and improving product performance.

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Hydrophobic Fumed Silica

Hydrophobic Fumed Silica | Applications and Product Polarity