As Asia, Europe, and North America continue shifting toward high-performance metallic powder coating systems, dense SiO₂ coated aluminum powder has emerged as a breakthrough technology. Its exceptional stability, safety, and durability make it ideal for modern powder coating applications where conventional aluminum powder struggles.

From outdoor architectural coatings to high-end appliance coatings, this next-generation powder coating raw material is redefining performance benchmarks.

---

What Is Dense SiO₂ Coated Aluminum Powder?

Dense SiO₂ coated aluminum powder is an advanced metallic pigment in which each aluminum flake is tightly encapsulated by a high-density silica (SiO₂) layer.
This coating dramatically improves:

• Chemical resistance

• Corrosion resistance

• Electrostatic spraying stability

• Compatibility with polyester, epoxy, and hybrid systems

The product is widely used as a non-leafing aluminum powder for metallic powder coating systems, ensuring uniform orientation and a smooth metallic effect without surface floatation issues.

Why this matters:

Industry testing shows that SiO₂-coated aluminum pigments achieve over 3× higher corrosion resistance compared to uncoated types (Source: Coating Industry Corrosion Stability Report, 2023).

---

High Stability Under Extrusion and Curing Processes

During powder coating production, aluminum pigments must endure:

• High-temperature extrusion

• Intense shear forces

• Cure temperatures of 160–200°C

Traditional aluminum flakes often lose brightness or react with resins, while dense SiO₂ coated aluminum powder remains structurally stable, maintaining:

• Metallic gloss

• Particle integrity

• Color uniformity

This stability makes it ideal for advanced metallic powder coating solutions.

---

Improved Safety—Reduced Risk of Gas Generation and Reaction

Bare aluminum may react with moisture or acidic/alkaline additives during extrusion or curing.
Dense silica coating prevents:

• Hydrogen gas formation

• Swelling or micro-bubbles

• Surface roughness

• Safety hazards during production

This coating barrier meets global powder coating safety standards, including EN, JIS, and ASTM requirements.

---

Enhanced Weather Resistance & Long-Term Durability

For exterior powder coatings—including architectural aluminum panels, outdoor furniture, and automotive parts—durability is critical.

Dense SiO₂ coated aluminum powder offers:

✔ UV Resistance

Silica coating protects aluminum flakes from oxidation and blackening.

✔ Anti-corrosion Performance

Salt-spray life increases dramatically in polyester-TGIC and super-durable systems.

✔ Long-Term Gloss Retention

Maintains metallic brilliance for 10+ years under outdoor exposure (industry benchmark data).

This positions the pigment as a high-durability metallic solution for premium powder coatings.

---

Applications & Performance Comparison

Typical Applications

---

Performance Comparison: Coated vs. Uncoated Aluminum Powder

---

Common Questions About Dense SiO₂ Coated Aluminum Powder

1. Is dense SiO₂ coated aluminum powder safe for powder coating extrusion?

Yes. The silica coating prevents unwanted reactions, making it significantly safer than bare aluminum pigments.

2. Does SiO₂ coating affect metallic brightness?

No. Modern dense-coating technology maintains or even enhances metallic sparkle and smoothness.

3. Can it be used in hybrid, epoxy, or polyester systems?

Absolutely. It is compatible with all major powder coating resin systems.

4. Is it more expensive?

While slightly higher in cost, its stability, durability, and reduced defect rate result in lower total production cost.

---

Why Manufacturers Are Moving Toward Dense SiO₂ Coated Aluminum Powder

For manufacturers seeking stable, durable, and premium metallic finishes, dense SiO₂ coated aluminum powder is rapidly becoming the preferred choice. Its superior chemical resistance, safety profile, and long-term aesthetic performance offer clear advantages over traditional metallic pigments.

As a leading global supplier, ZHANGQIU METALLIC PIGMENT CO., LTD provides consistent quality, narrow particle size distribution, and tailored solutions for powder coating systems.

Ready to upgrade your metallic powder coatings?
Contact our technical team: info@zqmetallic.com
Visit: https://zqmetallic.com/