Industrial Applications

Kaolin for Paper

Improving printability, gloss, and opacity while reducing pulp costs.

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Kaolin for Paper

Paper consists of a mesh of cellulose fibers. However, these fibers leave microscopic voids and rough surfaces that absorb too much ink and allow light to pass through (low opacity).

UT-WHITE works as a paper filler — its D50 4.571 µm particles fill voids between cellulose fibers in the paper web, improving brightness, opacity, and printability while reducing the amount of expensive fiber required. Its 96.6% ISO brightness adds natural whiteness to the sheet. UT-WHITE is a filler-grade kaolin; paper coating applications require a finer grade with D50 below 2 µm.

  • Improves brightness (96.6% ISO) and opacity in paper filler applications
  • Reduces expensive wood pulp usage
  • Extends machinery life (low abrasion)

Microscopic View: Fiber Filling

Ink sits on surface (High Holdout) Pulp Fiber Mesh Kaolin Particles

UT-WHITE platelets creating a smooth printing surface

Performance Characteristics

96.6% ISO Brightness

High natural brightness improves sheet whiteness and print contrast in paper filler applications without additional optical brightening agents.

Opacity Improvement

Platey particles scatter light within the paper web, increasing opacity and reducing show-through — allowing thinner sheets while maintaining printability.

Low Abrasion

UT-WHITE's soft, non-abrasive particle protects your expensive wire mesh and cutting blades.

Recommended Grades

Selected grades for paper manufacturing, from filler-grade bulk applications to coated paper and specialty thermal grades.

UT-WHITE High Brightness Kaolin

UT-WHITE

UT-WHITE is a natural hydrous kaolin with 96.6% ISO brightness, ground to D50 4.571 µm using alumina ball milling to prevent iron contamination. Improves sheet brightness and opacity as a filler in uncoated paper grades, replacing costly GCC while maintaining equivalent brightness.

Brightness96.6%
SiO272.2%
Al2O313.7%
pH Value8.0
Oil Adsorption (g/g)0.468
Median Size (D50)4.571 μm
Particle Size400-1200 Mesh
Download Spec Sheet
UT-WASH Precision Kaolin
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 GritZero (0.000% on 400 Mesh)
Target WhitenessHigh (94%+)
Purity LevelLess Contamination
Primary UseCeramics & Precision Coatings
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UT-ULTRA Calcined Kaolin
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 QualityMedical Grade Sterile
Impurity LevelZero Contamination
Primary UseThermal & Inkjet Paper
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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.

We will contact you back as soon as possible.

Inquire: sales@darson.co.th
Have a chat: +66 65 393 2426
Come visit: Nakhon Pathom, Thailand
Darson