Name: UT-WHITE for Paper
Brand: Darson

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Kaolin for Paper

Paper is a mesh of cellulose fibers with microscopic voids between them. Mineral filler occupies those voids, reducing the amount of pulp required per tonne of sheet.

UT-WHITE hydrous kaolin at D50 4.571 µm works as a bulk filler in packaging board, corrugating medium, kraft paper, and industrial grades where strength and cost matter more than sheet whiteness. UT-WHITE is built for the wet end. At 80.3% ISO brightness and D50 4.571 µm, it brings solid filler-grade whiteness to board and kraft furnish at a cost per tonne that works at high loading.

Reduces pulp consumption per tonne of sheet
Improves sheet formation and bulk in board grades
Consistent particle size across production lots

Microscopic View: Fiber Filling

UT-WHITE platelets creating a smooth printing surface

Performance Characteristics

Pulp Replacement

Mineral filler substitutes for a portion of fiber furnish at lower cost per tonne.

Opacity Support

Particles scatter light within the web, reducing show-through in packaging grades.

Batch Consistency

Alumina ball milling keeps particle size and iron pickup stable from lot to lot.

Recommended Grades

Grades for paper manufacturing, focused on bulk filler applications in board, kraft, and industrial paper.

UT-WHITE

UT-WHITE is a natural hydrous kaolin with 80.3% ISO brightness, ground to D50 4.571 µm using alumina ball milling to prevent iron contamination. Works as a bulk filler in packaging board, corrugating medium, and kraft paper, reducing pulp consumption per tonne of sheet.

Brightness (ISO)80.3%

Moisture0.33%

Mean Particle Size6.115 µm

D₅₀4.571 µm

Oil Absorption46.8 g/100g

pH8.0

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Coming Soon

UT-WASH

A high-brightness, washed grade optimised for paper coating slurries. Its controlled particle size distribution delivers a smooth coating surface with excellent light scattering, improving print gloss and ink holdout.

ProcessPrecision Washing

Target WhitenessHigh (94%+)

Target QualityGrit-Free

Purity LevelReduced Contamination

Primary UsePaper Filler

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Coming Soon

UT-ULTRA

Our upcoming fully calcined grade engineered for specialty thermal and inkjet papers requiring maximum brightness and precise pore-size control. Near-zero impurities ensure clean, consistent coating performance.

ProcessFull Calcination

Target WhitenessExtremely High

Target QualityLow-Iron, High-Purity

Purity LevelNear-Zero Impurities

Primary UseHigh-Brightness Paper Coating

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Factory direct pricing for local and international orders. Darson exports kaolin FOB Bangkok to buyers across Thailand, Bangladesh, Malaysia, India, and Southeast Asia.

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