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 Supply Silica dimethyl silylate/Fumed Silica oil soluble CAS 68611-44-9

Product Specification: Silica Dimethyl Silylate (Oil-Soluble Fumed Silica)

Basic Information

CAS Number: 68611-44-9
Chemical Name: Silica, dimethyl silylate-treated
Appearance: Fine white powder
Purity: ≥99%

Key Features

This product is a surface-treated form of fumed silica. It has been modified with dimethyl silyl groups to make it oil-soluble. Because of this treatment, it disperses easily in non-polar systems like mineral oils, silicone fluids, and organic solvents. It does not clump or settle quickly once mixed.

The material provides strong thickening and anti-settling performance. It also helps control flow and prevent sagging in liquid formulations. You can use it at low addition rates to get noticeable results.

Typical Applications

This silica works well in many industrial and consumer products. Common uses include:
– Paints and coatings (to stop pigment settling)
– Adhesives and sealants (to adjust viscosity and prevent slumping)
– Greases and lubricants (to improve consistency and stability)
– Cosmetics (as a texture enhancer in oil-based makeup)
– Inks (to control flow and drying behavior)

Handling and Storage

Store the product in a dry, cool place. Keep the container tightly closed when not in use. Moisture can reduce its effectiveness. Use standard dust control measures during handling. Wear gloves and eye protection as a basic safety step. Avoid breathing in fine particles.

Technical Data (Representative Values)

BET Surface Area: 50–400 m²/g
Loss on Drying (105°C, 2 hrs): ≤1.5%
pH (in water suspension): 5.0–8.0
Density: ~2.2 g/cm³

Always test the product in your specific system before full-scale use. Performance may vary based on formulation and processing conditions.

Applications of Supply Silica dimethyl silylate/Fumed Silica oil soluble CAS 68611-44-9

Applications of Oil-Soluble Fumed Silica (Silica Dimethyl Silylate, CAS 68611-44-9)

Thickening and Stabilizing Agent

Silica dimethyl silylate is widely used to thicken oils and organic liquids. It forms a stable network that prevents ingredients from separating. This makes it ideal for use in lubricants, greases, and cosmetic oils where consistent texture matters.

Anti-Settling Additive

In paints, coatings, and industrial fluids, solid particles often sink over time. Adding oil-soluble fumed silica keeps these particles evenly suspended. The product helps maintain uniform performance and appearance without constant remixing.

Rheology Control in Personal Care

Many lotions, sunscreens, and makeup products rely on silica dimethyl silylate to control flow and feel. It gives formulations a smooth, silky touch while stopping them from becoming too runny. This improves user experience and product stability on the shelf.

Matte Effect in Cosmetics

This treated silica absorbs excess oil on the skin. That’s why it’s common in foundations, powders, and primers. It delivers a soft-focus, matte finish that lasts longer and reduces shine throughout the day.

Performance Enhancer in Industrial Fluids

Gear oils, hydraulic fluids, and metalworking lubricants benefit from its addition. The silica boosts viscosity under stress but doesn’t interfere with fluidity at rest. This balance supports better machine protection and smoother operation.

Compatibility with Organic Systems

Unlike untreated silica, silica dimethyl silylate mixes easily into non-polar solvents and oils. Its surface treatment ensures clear, lump-free dispersions. This compatibility simplifies manufacturing and enhances final product clarity.

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 Supply Silica dimethyl silylate/Fumed Silica oil soluble CAS 68611-44-9

Frequently Asked Questions About Silica Dimethyl Silylate (Oil-Soluble Fumed Silica)

What is silica dimethyl silylate?

Silica dimethyl silylate is a treated form of fumed silica. It has been chemically modified to become oil-soluble. This makes it mix well with oils and organic liquids. Its CAS number is 68611-44-9.

Why use oil-soluble fumed silica instead of regular fumed silica?

Regular fumed silica does not mix easily into oils. It can clump or settle. Silica dimethyl silylate disperses smoothly in oil-based systems. This helps create stable, uniform products without lumps.

What are the main uses of this material?

It is widely used as a thickening agent, anti-settling aid, and flow controller. You will find it in cosmetics like foundations and lipsticks. It also appears in industrial coatings, adhesives, sealants, and lubricating greases.

Is silica dimethyl silylate safe for use in cosmetics?

Yes. When used within recommended limits, it is considered safe in cosmetic formulations. It helps improve texture and stability. Always follow local regulations and safety data sheets for proper handling.

How should I store this product?

Keep it in a cool, dry place. Make sure the container stays tightly closed. Moisture can affect its performance. Avoid exposure to high humidity or water to maintain its quality and effectiveness.