Industrial Applications

Kaolin for Rubber

Reinforcing durability, stiffness, and reducing costs in tires and mechanical goods.

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Reinforcement & Cost

In rubber compounding, fillers are essential for performance and cost control. While Carbon Black offers high reinforcement, it is expensive and limited to black products.

Darson Kaolin acts as a functional semi-reinforcing filler (Hard Clay). Its plate-like structure creates a "tortuous path" within the rubber matrix. This blocks crack propagation, improves air retention (permeability), and increases stiffness (modulus) at a significantly lower cost than Carbon Black or Precipitated Silica.

  • Increases Stiffness (Modulus)
  • Improves Abrasion Resistance
  • Excellent Air Barrier (Inner Liners)

Crack Propagation Blocking

CRACK FORCE Kaolin plates divert and stop cracks

Platelet structure creating a barrier against stress

Performance Characteristics

High Modulus

Increases the stiffness and hardness of the rubber compound.

Low Permeability

Platelet barrier reduces air passage, ideal for tire inner liners.

Cost Savings

Significant savings when replacing partial Carbon Black or Silica.

Recommended Grades

Grades selected for rubber and tyre compounding — improving mechanical properties, reducing permeability, and lowering compound costs.

UT-WHITE High Brightness Kaolin

UT-WHITE

A semi-reinforcing filler grade for general rubber compounding. Its fine platelet structure improves tear strength and reduces gas permeability in hoses and belts, while its high brightness is ideal for light-coloured rubber products.

SiO272.2%
Al2O313.7%
Whiteness96.6%
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

UT-WASH

A washed, ultra-clean grade for technical rubber goods and tyre inner liners where low ionic contamination is critical. Consistent particle geometry contributes to uniform dispersion throughout the rubber matrix.

SiO267.6%
Al2O316.8%
Whiteness94.1%
pH Value7.6
Oil Adsorption (g/g)0.511
Median Size (D50)4.233 μm
Particle Size600-1200 Mesh
Download Spec Sheet
UT-ULTRA Premium Calcined Kaolin

UT-ULTRA

Our upcoming calcined grade with near-zero metallic impurities, engineered for high-performance technical rubber where maximum compound purity and dimensional stability under heat cycling are required.

ProcessFull Calcination
Target WhitenessExtremely High
Target QualityMedical Grade Sterile
Impurity LevelNear Zero
Primary UseHigh-Performance Technical Rubber
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Factory direct pricing for local and international orders.

We will contact you back as soon as possible.

sales@darson.co.th
Nakhon Pathom, Thailand
Darson