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 Hydrophobic fumed silica, hydrophobic silica sio2 powder, fumed silica

Hydrophobic Fumed Silica – High-Performance SiO₂ Powder

What It Is

Hydrophobic fumed silica is a specially treated form of fumed silica (SiO₂). It starts as standard fumed silica but gets coated with silane-based compounds. This treatment changes its surface from water-attracting to water-repelling. The result is a fine, free-flowing white powder that resists moisture and mixes well into non-polar systems.

Key Features

This powder has strong thickening and anti-settling power. It helps control flow in liquids without adding much weight. Because it repels water, it stays stable in humid conditions or when mixed with oils, solvents, and resins. Its particles are extremely small—just nanometers in size—which gives it a huge surface area for better performance at low dosages.

Common Uses

Manufacturers use hydrophobic fumed silica in many industries. In paints and coatings, it prevents pigment settling and improves scratch resistance. In adhesives and sealants, it adds structure and stops sagging on vertical surfaces. It also works in cosmetics like powders and foundations to absorb oil and give a smooth feel. You’ll find it in industrial lubricants, printing inks, and even some food-grade applications where moisture control matters.

Why Choose This Grade

Not all fumed silica acts the same. The hydrophobic version offers unique benefits where water sensitivity is a problem. It disperses easily, maintains consistent viscosity over time, and keeps products stable during storage. It’s made under strict quality controls to ensure purity and performance batch after batch.

Technical Note: Typical surface treatment includes dimethyldichlorosilane or hexamethyldisilazane. Surface area ranges from 50 to 400 m²/g, depending on the grade. Always store in a dry place and keep containers sealed to preserve its hydrophobic nature.

Applications of Hydrophobic fumed silica, hydrophobic silica sio2 powder, fumed silica

Applications of Hydrophobic Fumed Silica

Thickening and Anti-Settling Agent

Hydrophobic fumed silica works well in paints, layers, and adhesives. It quits pigments and fillers from sinking to the bottom. This keeps the product secure gradually. The powder additionally offers the ideal thickness without transforming the shade or clarity.

Rheology Control in Sealants

Sealants need to remain in place as soon as applied. Hydrophobic silica SiO2 powder assists control circulation and protects against drooping. It makes sure the sealant holds its shape on upright surface areas. This is key for construction and automotive usages.

Water Repellency in Plastics

Adding fumed silica to plastics blocks moisture. This secures sensitive components from water damage. It also boosts surface smoothness and lowers fixed accumulation. Electronics and exterior gear benefit most from this attribute.

Free-Flow Aid in Powders

Dry mixes like flavors, cleaning agents, or drugs often clump in damp air. Hydrophobic fumed silica layers each particle. This stops them from sticking together. The result is a free-flowing powder that pours easily and shops much longer.

Efficiency Increase in Cosmetics

Make-up and skincare products utilize hydrophobic silica SiO2 powder for a silky feel. It soaks up oil without drying skin. It also assists powders spread evenly and last longer on the face.

Stability in Industrial Lubricants

Lubing oils must function under pressure and warmth. Fumed silica keeps the grease thick and steady. It does not break down like other thickeners. This implies much better security for relocating components in makers.

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 Hydrophobic fumed silica, hydrophobic silica sio2 powder, fumed silica

What is hydrophobic fumed silica?

Hydrophobic fumed silica is a special type of silica powder. It starts as regular fumed silica (SiO₂), then gets treated with chemicals like silanes. This treatment makes its surface repel water. Because of this, it mixes well in oils and organic liquids but not in water.

How is hydrophobic silica different from regular fumed silica?

Regular fumed silica attracts water—it’s hydrophilic. Hydrophobic silica has been modified so it rejects water. This change lets it work better in non-water-based systems. For example, it thickens paints, adhesives, and cosmetics that use oil instead of water.

What are the main uses of hydrophobic fumed silica?

People use it as a thickening agent, anti-settling aid, and free-flow additive. You’ll find it in sealants, coatings, inks, and even some food-grade products. It helps keep solid particles from sinking and stops powders from clumping.

Is hydrophobic fumed silica safe to handle?

Yes, but you still need care. Always wear gloves, eye protection, and a mask when handling the fine powder. It’s not highly toxic, but breathing in any fine dust can irritate your lungs. Store it in a dry place away from moisture to keep its performance strong.

Can I mix hydrophobic silica with water-based products?

Not really. Since it repels water, it won’t disperse well in water-based formulas. It works best in solvent-based or oil-based systems. If you need a thickener for water-based products, use regular (hydrophilic) fumed silica instead.