What is the difference between whiteness and brightness?

Whiteness (used in ATH/paper industry) is a perceptual measure that accounts for hue. Brightness (used in paper industry specifically) is the reflectivity at 457 nm. For ATH, whiteness is the more relevant spec.

Can ATH whiteness change in storage?

Yes, slightly. Prolonged exposure to humid air can cause surface hydration changes that reduce apparent whiteness by 1 to 2%. Store in sealed packaging away from direct sunlight.

What is the price premium for premium whiteness (at least 96%)?

20 to 30% premium versus standard 94% grade. For applications where color quality matters (premium engineered stone, white cable compounds), the premium is easily justified.

Do you supply ATH with custom particle size?

Yes. We can produce ATH with D50 from 0.5 to 45 μm. Custom grades require 5 MT minimum order. Development samples: 5 kg.

How do I get a COA for a specific batch?

Every shipment includes a batch-specific COA. We retain samples for 12 months, so you can request a COA for any batch within that window.

ATH Whiteness 96% and Particle Size Distribution: Why Both Matter

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