Hydrophilic Fumed Silica CAS

Description

Hydrophilic fumed silica is a finely divided form of silicon dioxide (SiO2) that has been treated to enhance its affinity for water. It is produced through a process called fuming, where silicon tetrachloride is reacted in a high-temperature flame to form silica particles. These particles are then surface-treated to make them hydrophilic, meaning they have a strong attraction to water molecules.

Hydrophilic fumed silica possesses several unique characteristics that make it valuable in various industries. It has an extremely high surface area, which allows it to absorb and retain large amounts of water, making it useful as a moisture control agent. It can also act as a thickening agent, improving the viscosity and texture of liquid formulations.

Due to its fine particle size and large surface area, hydrophilic fumed silica can also serve as a reinforcing filler, enhancing the mechanical properties of rubber and plastic materials. It provides reinforcement and improves tear strength, abrasion resistance, and dimensional stability.

In the pharmaceutical and cosmetic industries, hydrophilic fumed silica is used as a flow aid, viscosity modifier, and suspension agent in various formulations such as tablets, creams, lotions, and gels. It helps to improve the stability, texture, and performance of these products.

Furthermore, hydrophilic fumed silica finds applications in adhesives, sealants, coatings, paints, and other industrial products where it contributes to rheology control, anti-settling properties, and improved overall performance.

In summary, hydrophilic fumed silica is a versatile and valuable material with hydrophilic properties. It is used to control moisture, enhance viscosity, reinforce materials, and improve the performance of a wide range of products across industries.

Features

❶ High surface area: Hydrophilic fumed silica has an extremely high surface area, which enables it to interact and absorb large amounts of water or other liquids. This property makes it useful for moisture control and absorption applications.

❷ Hydrophilic nature: As the name suggests, hydrophilic fumed silica exhibits a strong affinity for water. Its surface has been treated to enhance its interaction with water molecules, allowing it to disperse easily in aqueous systems and form stable suspensions.

❸ Thixotropic behavior: Hydrophilic fumed silica demonstrates thixotropic behavior, meaning its viscosity decreases under shear stress and increases when at rest. This property contributes to its effectiveness as a thickening and stabilizing agent in various formulations.

❹ Rheology control: It offers excellent control over the rheological properties of liquid systems. By adjusting the concentration and dispersion of hydrophilic fumed silica, the flow characteristics, viscosity, and texture of formulations can be modified to achieve desired outcomes.

❺ Reinforcing properties: Hydrophilic fumed silica serves as a reinforcing filler, improving the mechanical properties of materials such as rubber and plastic. It enhances tensile strength, tear resistance, and dimensional stability.

❻ Compatibility: Hydrophilic fumed silica is compatible with a wide range of substances, including water, solvents, and various organic and inorganic materials. This versatility allows for its integration into diverse formulations and products.

❼ Stability: It provides stability to suspensions and emulsions by preventing settling or separation of components. This feature helps maintain the integrity and performance of products over time.

❽ Versatility: Hydrophilic fumed silica finds applications in multiple industries, including pharmaceuticals, cosmetics, adhesives, coatings, and more. Its multifunctional nature makes it a valuable additive with a broad range of uses.

Applications

Pharmaceuticals

It is used as a flow aid, viscosity modifier, and suspension agent in tablet formulations, oral liquids, ointments, and creams. It improves stability, flow characteristics, and texture in pharmaceutical products.

Cosmetics and Personal Care

Hydrophilic fumed silica acts as a thickening agent, stabilizer, and suspension aid in creams, lotions, gels, and other cosmetic formulations. It enhances texture, provides a smooth feel, and prevents settling of ingredients.

Adhesives and Sealants

It improves thixotropic behavior, viscosity control, and bonding strength in adhesives and sealants. Hydrophilic fumed silica enhances sag resistance and adhesion properties, ensuring efficient application and long-lasting performance.

Coatings and Paints

It serves as a rheology modifier, anti-settling agent, and thickener in coatings and paints. Hydrophilic fumed silica improves viscosity control, dispersion, and leveling properties, contributing to smooth and uniform coatings.

Rubber and Plastics

It acts as a reinforcing filler in rubber and plastic materials, enhancing mechanical properties such as tear strength, abrasion resistance, and dimensional stability. Hydrophilic fumed silica improves the processability and performance of rubber and plastic compounds.

Catalyst Supports

Hydrophilic fumed silica provides a high surface area and excellent dispersion properties, making it suitable as a support material for catalysts in various chemical processes.

Food and Beverages

It is used as an anti-caking agent, viscosity modifier, and stabilizer in food and beverage applications. Hydrophilic fumed silica enhances the flowability, texture, and stability of powdered mixes, sauces, and beverages.

Energy Storage

It finds applications in lithium-ion batteries as a conductive additive and rheology modifier, improving battery performance and stability.

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Specifications

Grades	HFS-150	HFS-200	HFS-300	HFS-380
Specific Surface Area (BET)	150±15 m²/g	200±20 m²/g	300±25 m²/g	380±30 m²/g
pH value in 4% dispersion	3.9-4.5	3.9-4.5	3.7-4.5	3.7-4.5
Loss on drying (2 hours at 105℃)	≤1.5%	≤2.0%	≤2.0%	≤2.5%
Loss on ignition(2 hours at 1000℃ based on material dried for 2 hours at 105℃)	≤2.0%	≤2.0%	≤2.5%	≤2.5%
Sieve Residue(45μm)	≤250mg/kg	≤250mg/kg	≤250mg/kg	≤250mg/kg
Silica Content(Based on ignited material)	≥99.8%	≥99.8%	≥99.8%	≥99.8%
Tap Density(Based on material dried at 105℃ for 2 hours)	40-60g/dm³	40-60g/dm³	40-60g/dm³	40-60g/dm³
Typical Applications	1.HTV and RTV Silicone rubber 2.Adhesives and Sealants 3.Coatings and Paintings	1.Coatings & Paintings 2.Adhesives & Sealants 3.HTV&RTV Silicon Rubbers 4.Thin Film & UPR 5.Printing Ink 6.Fertilizer & Pesticide 7.Cosmetics	1.Coatings & Paintings 2.Silicone rubber and Other elastomers 3.Thin Film & UPR 4.Adhesives and Sealants 5.Printing ink	1.Coatings & Paintings 2.Silicone rubber and Other elastomers 3.UPR 4.Adhesives and Sealants 5.Printing ink