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Ultra-Fine Calcined Kaolin for Thermal Coated Paper

Ultra-Fine Calcined Kaolin for Thermal Coated Paper

  • Hegman: 4.5 Min.
  • PH (28% solids): 6.0-7.0
  • ISO Brightness (%): 91±1
  • Specific Gravity (g/cm³): 2.53
  • Bulk Density (kg/m³): 350
  • Oil Absorption (g/100g): 75-80

Additional information

Product Introduction

Superfine Calcined Kaolin is a highly engineered aluminum silicate material, processed to achieve an ultra-fine particle size with excellent distribution. This product offers a combination of high brightness, low abrasion, good opacity, moderate oil absorption, high viscosity, and excellent flowability. It undergoes controlled heat treatment to remove crystalline-bound hydroxyl groups, enhancing brightness and providing superior performance for various applications.

Primarily designed for use in the production of thermal paper, high-end coated paper, and other specialized papers, Superfine Calcined Kaolin improves paper brightness, opacity, and smoothness, while reducing production costs by replacing a significant portion of titanium dioxide (TiO₂). It enhances ink absorption, printing adaptability, and dispersibility, making it ideal for high-solid content coatings used in high-speed coating processes.

Product Features

  • High Brightness: Improves the aesthetic quality and whiteness of paper.
  • Low Abrasion: Minimizes damage to equipment and increases production efficiency.
  • Excellent Opacity: Provides superior coverage and reduces the need for other expensive pigments.
  • Moderate Oil Absorption: Balances oil absorption and flowability for easy processing.
  • High Viscosity with Good Flowability: Ensures easy handling and mixing in high-solid content coatings.
  • Controlled Heat Treatment: Removes hydroxyl groups, enhancing the chemical stability and brightness.

Product Specification

Test ItemsUnitSpecification
Physical FormHighly Pulverized Powder
ISO Brightness (%)91±1
Screen Residue (325 Mesh)%≤0.005
Free Moisture @105°C%0.5 max.
pH (28% solids)6.0-7.0
Specific Gravityg/cm³2.53
Particle Size (% ≤2μm)%88±2
Oil Absorption (g/100g)g/100g75-80
Bulk Densitykg/m³350
Hegman4.5 Min.
Abrasion Value (mg/100k rotation)mg20 Max.

Chemical Composition

ComponentPercentage (%)
SiO₂52.0 ± 2
Al₂O₃45.0 ± 2
Fe₂O₃≤ 0.50
TiO₂≤ 0.80
CaO≤ 0.50
Na₂O≤ 0.20
K₂O≤ 0.10
MgO≤ 0.20

Product Application

  • Thermal Paper: Enhances brightness, opacity, and smoothness, ensuring better ink receptivity and print quality.
  • Coated Paper: Improves gloss, opacity, and printability while reducing the need for expensive titanium dioxide.
  • High-Speed Coating: Ideal for high-solid content coatings used in high-speed paper coating processes.
  • Ink and Paints: Provides good opacity and balance between viscosity and flowability in paints and inks.

 

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