Why Particle Size Distribution Matters More Than Brightness

The particle size distribution of aluminum pigment powder determines how light is reflected and the performance of the coating.

A narrow particle size distribution results in:

• A more uniform metallic luster
• Higher hiding power
• Better film orientation
• Better adhesion and durability

A product may have a bright appearance, but if the particle size variation is too large, the final coating will appear mottled, unstable, and have reduced protective performance.

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How Particle Size Distribution Affects Optical Performance
Even minute variations in particle size can alter visual effects.

1. Larger Particles → Mirror-like Metallic Effect

• Stronger Light Reflection
• More Noticeable "Sparkle" Effect
• Lower Coverage at the Same Dosage

Suitable for automotive coatings and high-end industrial coatings.
2. Smaller Particles → Smoother, Silky Gloss

• Higher Hiding Power
• More Uniform Tone
• Better for Thin Film Applications

Commonly used in printing inks, plastics, and consumer electronics coatings.

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Why Brightness Often Misleads Buyers

Brightness is easy to manipulate. Some suppliers use:

• Chemical brighteners

• Surface treatments

• Over-polished flakes

These can increase gloss temporarily but reduce:

• Weather resistance

• Chemical stability

• Recoat performance

ISO 7724 readings show that brightness variance among samples with similar particle size distribution is often less than 10%, while performance differences caused by poor distribution can exceed 50% in hiding power.

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How ZHANGQIU METALLIC PIGMENT Controls Particle Size

With over 35 years of metallic pigment expertise, we rely on data-driven methods rather than visual guesswork.

Our flake classification uses:

• Laser diffraction analysis (ISO 13320 compliant)

• Centrifugal separation for narrow-grade products

• Automated sieving for powders

• Wet milling precision control

This ensures aluminum pigment powder with stable, predictable behavior.

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Applications & Comparison: Why Distribution Beats Brightness

Below is a simplified comparison based on internal testing:

Real-world data from our automotive clients show that optimized particle size distribution reduces coating usage by 8–15% while increasing gloss stability.

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Frequently Asked Questions

1. Does higher brightness mean better quality?

No. Brightness alone cannot predict hiding power, chemical resistance, or stability. Particle size distribution is a far more reliable indicator.

2. How many particle grades should I check?

Look for D10, D50, and D90 values. These three reveal the spread and uniformity of the aluminum flakes.

3. Are smaller flakes always better?

Not necessarily. Small flakes improve hiding power, while large flakes enhance mirror-like shine. It depends on the application.

4. Is aluminum pigment powder different from aluminum paste?

The base material is similar, but aluminum paste contains solvents and additives for improved dispersion in coatings.

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Choose Performance, Not Just Shine

Brightness may catch your eye, but particle size distribution determines success.
If you want stable metallic effect, smoother coating films, and reliable industrial performance, always evaluate flake size distribution first.

For technical guidance or tailored grades of aluminum pigment powder, contact our expert team:
info@zqmetallic.com
https://zqmetallic.com/
ZHANGQIU METALLIC PIGMENT CO., LTD