Understanding the Difference Between SiO2 Coated Aluminum Powder and Ordinary Aluminum Powder

Aluminum powder is widely used in aerated concrete, metal coatings, inks, and chemical reactions.

However, ordinary aluminum powder readily reacts with water, acids, and alkalis, leading to corrosion or gas generation.

In contrast, SiO2-coated aluminum powder has a layer of nano-silica (SiO2) on its surface, providing superior protection and stability.

1. What Is SiO2 Coated Aluminum Powder?

SiO2-coated aluminum powder is made by adding a silicon dioxide protective layer to the surface of aluminum sheets or spherical particles.

Key scientific features

• A dense SiO2 film isolates aluminum from moisture

• Strong resistance to oxidation and corrosion

• Improved chemical stability in reactive environments

• Lower gas generation when mixed with water

Why it matters

The SiO2 coating drastically reduces unwanted reactions, making it ideal for sensitive or high-performance applications.

2. Ordinary Aluminum Powder: Characteristics and Limitations

Ordinary aluminium powder (including flake and spherical forms) has good brightness and reactivity but is prone to:

• Hydrogen gas generation when exposed to water

• Oxidation during storage

• Darkening in acidic or alkaline systems

• Limited compatibility with waterborne coatings

Because of these sensitivities, it requires strict handling and careful formulation.

3. Key Differences Between SiO2 Coated and Ordinary Aluminum Powder

A. Chemical Stability

B. Safety

• Ordinary aluminum may generate gas and increase pressure in containers.

• SiO2 coated aluminum ensures safer storage and mixing conditions.

C. Compatibility

• Ordinary aluminum powder fits traditional solvent-based systems.

• SiO2 coated aluminum powder works with:

• Water-based coatings

• Corrosion-resistant coatings

• Chemical systems requiring stability

D. Cost vs. Performance

• Ordinary aluminum is cheaper but more reactive.

• SiO2 coated powder has higher production cost but offers superior reliability.

Applications & Performance Comparison

Where Ordinary Aluminum Powder Is Used

• AAC blocks (aerated concrete)

• Fireworks and energetic materials

• General-purpose metallic coatings

• Powder metallurgy

Where SiO2 Coated Aluminum Powder Performs Best

• High-corrosion-resistant coatings

• Waterborne systems

• Fluorocarbon exterior coatings

• Coil coatings

• Environments requiring long-term stability

Performance Summary

SiO2 coated grades outperform ordinary aluminum when:

• Water resistance is required

• Gas control is critical

• High durability is expected

• Strong acid/alkali resistance is needed

Call to Action

Understanding the differences between ordinary aluminum powder and SiO2 coated aluminum powder is essential for choosing the right material for your production needs.

If you need stable, corrosion-resistant, or water-compatible metallic pigments, SiO2 coated aluminum powder is the optimal solution.

Silver Rocket provides:

• High-stability SiO2 coated aluminum powder

• Standard aluminum powder and aluminum paste

• Customized solutions for coatings, AAC, and industrial applications

Email: info@silverocket.com
Website: https://www.silverocket.com/