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 Fumed Silica Nano Silica Powder Silicon Dioxide silicon dioxide SiO2 Hydrophobic Fumed Silica

Hydrophobic Fumed Silica – High-Purity Nano Silicon Dioxide (SiO₂)

Premium Quality for Demanding Applications

This hydrophobic fumed silica is a nano-sized silicon dioxide (SiO₂) powder made through flame hydrolysis. It delivers excellent performance in thickening, anti-settling, and flow control. The particles are extremely fine, with high surface area and strong water-repellent properties.

Key Features:
– Ultra-fine particle size (typically 5–40 nm)
– Treated surface for strong hydrophobicity
– High purity (>99.8% SiO₂)
– Low moisture content
– Excellent dispersibility in organic systems

Common Uses:
This material works well in adhesives, sealants, coatings, inks, and cosmetics. It prevents pigment settling, controls viscosity, and improves texture without affecting clarity. In silicone rubber and RTV systems, it boosts mechanical strength and stability. Its hydrophobic nature makes it ideal for moisture-sensitive formulations.

Handling and Storage:
Store in a dry, cool place in sealed containers. Keep away from moisture and direct sunlight. Use standard industrial hygiene practices when handling fine powders—wear gloves, eye protection, and a dust mask if needed.

Technical Support:
We offer full documentation including safety data sheets (SDS), certificates of analysis, and application guidance. Our team can help you choose the right grade for your specific process or product.

This hydrophobic fumed silica meets international quality standards. It is produced under strict controls to ensure batch-to-batch consistency. Whether you need small lab quantities or large-scale industrial supply, we provide reliable, high-performance material tailored to your needs.

Applications of Fumed Silica Nano Silica Powder Silicon Dioxide silicon dioxide SiO2 Hydrophobic Fumed Silica

Applications of Hydrophobic Fumed Silica (SiO₂)

What It Is

Hydrophobic fumed silica is a nano-sized form of silicon dioxide (SiO₂). It starts as regular fumed silica but gets treated to repel water. This makes it useful in many products where moisture control matters.

Where It’s Used

In paints and coatings, this powder stops liquids from separating. It also helps the paint stay smooth and not sag on walls. The hydrophobic nature means the coating resists water better over time.

In adhesives and sealants, it acts as a thickener. It keeps the material from dripping or running. At the same time, it improves how well the sealant sticks and lasts outdoors.

Plastics and rubber makers add it to boost strength without losing flexibility. It also stops powders from clumping during storage or mixing. That makes production easier and more consistent.

Cosmetic products like powders and creams use it for a silky feel. It absorbs oil on the skin but does not absorb water. This keeps makeup looking fresh longer.

In industrial lubricants and greases, it prevents oil from leaking out. It holds the grease in place even under heat or pressure. That extends equipment life and reduces maintenance.

Food-grade versions exist too. They work as anti-caking agents in powdered foods. A small amount keeps spices, drink mixes, or baking powder free-flowing.

Electronics benefit as well. The powder fills gaps in components while blocking moisture. This protects circuits from humidity damage.

Why It Works

Its tiny particle size gives it a huge surface area. The surface treatment with silanes makes it reject water. Together, these traits let it mix well into liquids and solids while adding stability, texture, or protection.

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 Nano Silica Powder Silicon Dioxide silicon dioxide SiO2 Hydrophobic Fumed Silica

Frequently Asked Questions About Hydrophobic Fumed Silica

What is hydrophobic fumed silica?

Hydrophobic fumed silica is a fine powder made from silicon dioxide (SiO₂). It starts as regular fumed silica. Then it gets treated with special chemicals. This treatment makes it repel water. That’s why it’s called “hydrophobic.”

How does it work in products?

This powder thickens liquids and stops particles from clumping. It also helps keep mixtures stable over time. Because it resists water, it works well in wet or humid conditions. You’ll find it in paints, adhesives, cosmetics, and industrial coatings.

Is it safe to handle?

Yes, but you must take basic safety steps. Always wear gloves, eye protection, and a mask when handling the powder. It’s not toxic, but breathing in fine dust can irritate your lungs. Store it in a dry place away from moisture.

What’s the difference between hydrophobic and hydrophilic fumed silica?

Hydrophilic fumed silica attracts water. Hydrophobic fumed silica pushes water away. The hydrophobic type has been surface-treated. This change lets it perform better in water-based or high-moisture environments.

How should I store hydrophobic fumed silica?

Keep it sealed in its original container. Store it in a cool, dry area. Moisture won’t ruin it like it would with hydrophilic types, but long-term exposure can still reduce performance. Use clean, dry tools when scooping the powder to avoid contamination.