Overview of Fumed Silica

Fumed silica, also known as pyrogenic silica, is an ultra-fine, high-purity amorphous silicon dioxide (SiO2) produced via the combustion of silicon tetrachloride in an oxygen-hydrogen flame. It appears as a fluffy white powder and is valued for its ability to thicken, stabilize, and reinforce materials.

Features of Fumed Silica

• High Surface Area: Typically ranges from 50 to 380 m²/g, providing excellent thickening and reinforcing properties.
• Hydrophilic or Hydrophobic Variants: Available in both forms depending on surface treatment, allowing for tailored applications.
• Excellent Thixotropy: Increases viscosity and improves flow properties of liquids and pastes.
• Chemical Inertness: Resistant to most chemicals, making it suitable for a wide range of industrial uses.

•  Enhances free-flowing properties and stability.

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Specification of Fumed Silica

Fumed silica is a very fine white powder. People make it by burning silicon tetrachloride in a flame of hydrogen and oxygen. This creates tiny particles of silicon dioxide. These particles are extremely small. They form chain-like structures. This structure gives fumed silica unique properties.

The surface area is a key specification. It tells you how much surface the powder has. This area is measured in square meters per gram. Fumed silica has a very high surface area. Common grades range from about 50 m²/g to over 400 m²/g. Higher surface area usually means stronger effects.

Particle size is another important point. Primary particles are incredibly tiny. They are only 5 to 50 nanometers across. These particles stick together. They form bigger groups called aggregates. Aggregate size is often measured. It ranges from about 0.1 to 0.5 micrometers typically. This small size is crucial for its performance.

The density of fumed silica is very low. Bulk density is usually between 30 and 60 grams per liter. Tapped density is slightly higher. This lightness comes from its fluffy structure. The powder has a lot of air between particles.

Fumed silica is mostly pure silicon dioxide (SiO₂). The purity is very high. It is often above 99.8%. Moisture content is also specified. It is usually kept very low. This prevents clumping. Loss on ignition (LOI) measures volatile content. It is another key purity indicator.

The pH value matters. Some grades are acidic. Others are treated to be neutral or basic. The pH affects how it interacts with other materials. Its surface chemistry is important too. Hydrophilic grades absorb water easily. Hydrophobic grades resist water. They are treated with special chemicals.

Fumed silica acts as a thickener. It makes liquids thicker without heat. It prevents settling in paints and coatings. It controls flow in adhesives and sealants. It reinforces silicone rubber. It acts as an anti-caking agent in powders. It improves stability in many products. The specifications determine the best grade for each job. Surface area, density, pH, and surface treatment guide the selection.

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Applications of Fumed Silica

Fumed silica is a very fine powder made from silicon. It improves many products we use every day. It makes things thicker and stronger. It controls how liquids flow.

Adhesives and sealants need fumed silica. It stops them from dripping or sagging before they dry. It makes them stick better and last longer. You find it in construction glues and caulks. It helps car gaskets seal tightly.

Paints and coatings use it too. It stops the paint from settling in the can. It makes the paint flow smoothly onto walls or cars. It helps the paint resist scratches and weathering. Powder coatings get better flow and coverage with fumed silica.

Pharmaceuticals rely on it. It makes pills flow freely in manufacturing machines. It prevents powders from clumping together. It helps control how fast medicine releases in your body. It acts as a carrier for active ingredients.

Silicone rubber gets much better with fumed silica. It makes the rubber much stronger and more tear-resistant. It helps the rubber hold its shape under heat and pressure. This is vital for gaskets, seals, and medical tubing. It improves the rubber’s clarity.

Food products use small amounts. It stops powdered ingredients like spices from caking. It keeps powders flowing freely. It acts as an anti-foaming agent in some liquids.

Plastics and composites incorporate it. It reinforces the material, making it stiffer. It improves how the plastic flows during molding. It reduces shrinkage and warping. It helps make parts lighter and stronger.

Fumed silica works in batteries. It thickens the electrolyte paste. This helps the paste stay put inside the battery. It improves performance and safety.

Company Introduction

Welcome to HiphopGalaxy, a trusted global supplier of high-quality silicon dioxide (SiO2) powder, renowned for its exceptional purity and performance. Established with a vision to deliver cutting-edge materials that meet the diverse needs of modern industries, we have positioned ourselves as a leading player in the international market.

Our SiO2 powders find applications across multiple sectors, including adhesives, coatings, pharmaceuticals, cosmetics, polymers, and electronics. Each application benefits from the unique properties of our products—high surface area, excellent thixotropy, chemical inertness, and superior reinforcement capabilities. Whether you need hydrophilic or hydrophobic variants, we offer tailored solutions to meet your specific requirements.

If you have any questions, please feel free to contact us(nanotrun@yahoo.com).

Payment Methods

T/T, Western Union, Paypal, Credit Card etc.

Shipment Methods

By air, by sea, by express, as customers request.

5 FAQs of Fumed Silica

What is fumed silica?
Fumed silica is a very fine powder. It’s made from silicon dioxide. People make it by burning silicon tetrachloride in a flame. This process creates tiny particles. These particles stick together in chains. This gives fumed silica unique properties.

Why use fumed silica?
Fumed silica acts as a thickener. It makes liquids thicker. It stops liquids from dripping or settling. It also makes materials stronger. It helps products keep their shape. This is useful in many industries.

How does fumed silica thicken things?
Fumed silica particles are incredibly small. They have a huge surface area. These particles form a network. This network traps liquid molecules. Trapping the liquid makes the mixture thicker. It becomes harder to flow.

What makes fumed silica different?
Fumed silica is very pure. It has very low levels of impurities. Its small particle size gives it high surface activity. This means it interacts strongly with other materials. This interaction provides better thickening. It gives better reinforcement than other powders.

Where is fumed silica used?
You find fumed silica in many products. It’s common in silicone sealants and adhesives. It thickens paints and coatings. It prevents caking in powders like spices. It reinforces rubber goods. It improves the texture of cosmetics. It’s even used in some foods.

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