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.

Specification of Silicon Dioxide Hydrophobic Fumed Silica SiO2 Powder Cas 7631-86-9

Hydrophobic Fumed Silica SiO Two Powder– CAS 7631-86-9

Product Introduction

This hydrophobic fumed silica is a high-purity silicon dioxide (SiO ₂) powder. It carries the CAS number 7631-86-9. The product is made by treating hydrophilic fumed silica with organosilanes or chlorosilanes. This treatment offers the surface area water-repellent buildings while keeping the core structure undamaged.

Secret Features

The powder has a really fine particle dimension and a big surface area. It flows freely and blends well right into many systems. Due to the fact that it fends off water, it stays stable in damp conditions. It additionally protects against clumping and aids manage viscosity. The product shows solid enlarging and anti-settling efficiency in non-polar fluids like oils and solvents.

Technical Specifications

– Chemical Call : Silicon Dioxide
– CAS Number : 7631-86-9
– Appearance : White, free-flowing powder
– Surface area Therapy : Organosilane or chlorosilane-based
– Hydrophobicity : High (call angle > 100 °).
– Loss on Drying : ≤ 1.5%.
– Ignition Loss : 5– 20% (varies by grade).
– pH Value (in 4% diffusion): 3.6– 4.8.
– Specific Area : 50– 400 m TWO/ g (wager approach).

Usual Applications

This silica is utilized in lots of markets. It functions well in paints, finishes, and adhesives to stop sagging and working out. In cosmetics, it improves appearance and oil absorption. It likewise serves as a flow aid in powders and as an enhancing filler in silicone rubber. Industrial lubes, oils, and sealants use it to handle uniformity and security gradually.

The item satisfies rigorous top quality criteria. Each batch is checked for purity, fragment size, and efficiency. It is packed in secured bags or drums to keep dampness out and maintain its hydrophobic nature during storage space and transportation.

Applications of Silicon Dioxide Hydrophobic Fumed Silica SiO2 Powder Cas 7631-86-9

Applications of Hydrophobic Fumed Silica (SiO TWO)– CAS 7631-86-9

Enhancing Performance in Coatings and Paints

Hydrophobic fumed silica is widely made use of in coatings and paints to boost structure and security. It stops pigments from settling and aids the combination keep attire. The powder also adds density without affecting clearness. This makes it optimal for high-grade coatings that resist water and last longer.

Improving Adhesives and Sealants

In adhesives and sealers, this silica regulates circulation and stops drooping. It provides the item sufficient body to hold its form during application. At the exact same time, it maintains the product easy to spread. The hydrophobic nature suggests moisture won’t damage the bond in time.

Improving Effectiveness in Cosmetics

Lots of aesthetic products make use of hydrophobic fumed silica to create a smooth feel. It soaks up excess oil on the skin and assists powders stay matte. Due to the fact that it pushes back water, makeup lasts longer even in humid conditions. It also enhances how other active ingredients mix together.

Supporting Industrial Lubricants

Lubricants and oils gain from this additive as well. It enlarges the base liquid simply enough to keep it in place. The silica does not react with other chemicals, so efficiency stays regular. Its water-repelling quality safeguards metal components from rust and wear.

Enhancing Rubber and Plastics

When contributed to rubber or plastic substances, hydrophobic fumed silica enhances strength and resilience. It aids the product deal with anxiety without breaking. The powder also enhances exactly how the final product looks by minimizing surface area issues. Manufacturers depend on it for consistent high quality in molded parts.

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 Silicon Dioxide Hydrophobic Fumed Silica SiO2 Powder Cas 7631-86-9

Frequently Asked Questions About Hydrophobic Fumed Silica (SiO₂)

What is hydrophobic fumed silica?

Hydrophobic fumed silica is a fine white powder made from silicon dioxide (SiO₂). It starts as regular fumed silica, then gets treated with special chemicals like silanes. This treatment makes the surface repel water. The result is a material that mixes well with oils and organic liquids but stays dry in humid conditions.

What is the CAS number for this product?

The CAS number for silicon dioxide, including hydrophobic fumed silica, is 7631-86-9. This number helps identify the chemical no matter how it’s processed or used.

Why use hydrophobic instead of regular fumed silica?

Regular fumed silica absorbs moisture from the air. That can cause clumping or weaken performance in some products. Hydrophobic fumed silica avoids this problem. It keeps powders free-flowing and maintains consistent thickening or anti-settling effects in paints, adhesives, and cosmetics—even in wet environments.

Where is hydrophobic fumed silica commonly used?

This powder works in many industries. You’ll find it in coatings to prevent sagging, in sealants to control flow, in cosmetics for smooth texture, and in industrial lubricants to improve stability. It’s also used in food-grade applications where moisture resistance matters.

How should it be stored?

Keep hydrophobic fumed silica in a cool, dry place. Always seal the container tightly after use. Even though it resists water, long exposure to high humidity may reduce its effectiveness over time. Store away from strong acids or bases to maintain quality.