Name: UT-WHITE for Paper
Brand: Darson

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Kaolin for Paper

Kaolin (also called China clay)

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-LUMP

Entry-level hydrous kaolin, rotary-screened and sun-dried, as fine powder with small lumps. At 74.3% ISO brightness, a cost-effective choice for ceramic bodies, construction, and agricultural use.

Brightness (ISO)74.3%

Moisture0.51%

Mean Particle Size7.742 µm

D₅₀5.047 µm

Oil Absorption48.0 g/100g

pH7.02

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UT-WHITE

Finely ground hydrous kaolin with 80.3% ISO brightness and a consistent 400-1200 mesh particle size, for smoother, more uniform mixing. A bright, reliable filler for rubber compounds, plastics, paper, and adhesives.

Brightness (ISO)80.3%

Moisture0.33%

Mean Particle Size6.115 µm

D₅₀4.571 µm

Oil Absorption46.8 g/100g

pH8.0

Download Spec Sheet

Coming Soon

UT-WASH

A meticulously refined material developed for technical precision. The specialized washing process eliminates grit to ensure smooth, defect-free production in ceramics where structural integrity is critical.

ProcessPrecision Washing

Target WhitenessHigh (94%+)

Target QualityGrit-Free

Purity LevelReduced Contamination

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Coming Soon

UT-ULTRA

Our upcoming calcined kaolin grade, processed at high temperatures to maximize structural hide and opacity. Designed for specialty industrial applications requiring higher purity and performance.

ProcessFull Calcination

Target WhitenessExtremely High

Target QualityLow-Iron, High-Purity

Purity LevelNear-Zero Impurities

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Start Your Inquiry

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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