Fumed Silica

Fumed Silica is a synthetic, amorphous silicon dioxide characterized by its extremely fine particle size, high specific surface area, and unique branched, chain-like structure. It is produced by the flame hydrolysis of silicon tetrachloride in a high-temperature hydrogen-oxygen flame, resulting in a white, fluffy, and lightweight powder. This distinctive morphology makes fumed silica an indispensable additive for controlling rheology, improving physical properties, and enhancing stability across a vast range of industrial applications.

Basic Information of Fumed Silica

CAS No.:	112945-52-5 (This CAS number is commonly used for synthetic amorphous silica, including fumed silica)
EC No.:	231-545-4
Linear Formula:	SiO₂
Molecular Weight:	60.08
Appearance:	White, amorphous powder
Melting Point:	>1600°C
Primary Particle Size:	Typically 7-40 nm (nanometers)
Density:	2.3 lb/cu.ft at 25 °C (bulk density)(lit.)
Hydrophilic vs. Hydrophobic:	Available in both hydrophilic (untreated) and hydrophobic (surface-treated) grades to suit specific formulation needs.
Rheological Properties:	Excellent thixotropic, thickening, and anti-settling capabilities.
Flow Aid:	Acts as an effective reinforcing filler in elastomers and plastics.
RIDADR:	Improves powder flow and prevents caking.
Adsorbent:	Good adsorption capacity for liquids.
Chemical Structure:

Applications of Fumed Silica

Fumed Silica's versatility stems from its unique physical and chemical properties, making it a critical additive in numerous industries:

• Paints, Coatings, and Inks:

• Acts as a highly effective rheology modifier and thickener, preventing pigment settling and improving sag resistance.

• Enhances scratch and abrasion resistance, and provides matting effects in various finishes.

• Improves dispersion stability and print quality in inks.

• Adhesives and Sealants:

• Provides thixotropy and viscosity control, preventing slumping and improving application properties.

• Acts as a reinforcing filler, enhancing mechanical strength and cohesive properties.

• Silicone Rubber and Elastomers:

• Essential reinforcing filler in silicone rubbers (HTV, RTV, LSR), significantly improving tear strength, tensile strength, and hardness.

• Contributes to the transparency and processability of silicone compounds.

• Plastics and Composites:

• Improves mechanical properties, heat resistance, and dimensional stability.

• Used as an anti-blocking agent for plastic films.

• Cosmetics and Personal Care:

• Functions as a thickener and suspending agent in creams, lotions, and gels.

• Provides a pleasant, non-greasy feel and enhances stability in makeup formulations.

• Used as an adsorbent for sebum and in antiperspirant/deodorant sticks.

• Pharmaceuticals:

• Used as a glidant (flow aid) and disintegrant in tablet formulations.

• Acts as a desiccant and a carrier for liquid active ingredients.

• Food Industry:

• Used as an anti-caking agent for powdered food products.

• Aids in flowability and prevents moisture absorption.

• Consistent Performance: Our robust quality control processes guarantee the reliability and batch-to-batch consistency of our fumed silica.

• Reliable Supply Chain: Benefit from our efficient logistics and stable inventory, ensuring timely delivery to support your production schedules.

• Expert Technical Support: Our knowledgeable team is ready to provide in-depth technical information and guidance to help you select the ideal fumed silica grade and optimize its incorporation into your products.