Hengrui Brand Kaolin

Product Overview
K-80 represents a premium-grade calcined kaolin engineered through optimized thermal processing to achieve superior performance characteristics in coating formulations. This lamellar-structured anhydrous aluminum silicate (Al₂SiO₅) powder is specifically designed to enhance both the functional and economic parameters of paint systems while maintaining exceptional quality standards.

Manufacturing Excellence

• Precision calcination at 1050-1150°C for optimal crystal phase transformation

• Advanced air classification technology ensuring consistent particle morphology

• Proprietary surface modification for improved resin compatibility

• Rigorous quality control at every production stage

Key Technical Parameters

• Whiteness Index: 94-96% (ISO 2470-20 standard)

• Particle Size Distribution:

  • D50: 1.0-1.5μm

  • D90: <4.5μm

  • 325 Mesh Residue: ≤0.01%

• Oil Absorption: 30-40g/100g (ASTM D281)

• Specific Surface Area: 12-18 m²/g (BET method)

• Refractive Index: 1.62

Chemical Composition

• SiO₂: 53±1%

• Al₂O₃: 45±1%

• Fe₂O₃: ≤0.4%

• TiO₂: ≤0.2%

• LOI (1000°C): ≤0.5%

Performance Advantages in Coating Systems

• TiO₂ Extension Efficiency:

  • Achieves 20-30% replacement of titanium dioxide

  • Maintains 95% of original opacity

  • Reduces raw material costs by 12-18%

• Enhanced Film Properties:

  • 50-60% improvement in scrub resistance (ASTM D2486)

  • 40% increase in crack resistance

  • Superior salt spray resistance exceeding 1000 hours (ASTM B117)

• Optical Performance:

  • Excellent matting efficiency (60° gloss reduction up to 30%)

  • Improved dry hide characteristics

  • Enhanced color consistency

Technical Comparison with Conventional Fillers
| Property | K-80 | Standard Kaolin | Calcium Carbonate |
|----------|------|----------------|-------------------|
| TiO₂ Extension | 25% | 10% | 5% |
| Scrub Resistance | +55% | +20% | +15% |
| Oil Absorption | 35g/100g | 60g/100g | 20g/100g |
| Salt Spray Resistance | Excellent | Good | Fair |
| Cost Saving Potential | High | Moderate | Low |

Mechanism of Action

• Lamellar structure creates tortuous path for corrosive elements

• Optimized particle packing improves film integrity

• Surface chemistry enhances resin-filler interaction

• Controlled light scattering maintains opacity

Recommended Formulation Guidelines

• Architectural Coatings: 8-15% by weight

• Industrial Coatings: 5-12%

• Wood Coatings: 10-18%

• Marine Coatings: 7-14%

Sustainability Benefits

• 25% lower carbon footprint versus alternative extenders

• Enables reduced TiO₂ usage without performance compromise

• REACH compliant

• VOC-free formulation compatibility

Quality Assurance

• ISO 9001:2015 certified manufacturing

• Batch-to-batch consistency guaranteed

• Full material traceability

• Comprehensive technical documentation available

Packaging & Handling

• 25kg multi-layer paper bags with moisture barrier

• Bulk silo loading options

• 18-month shelf life in dry conditions

• Non-hazardous material classification

Technical Support Services

• Formulation optimization assistance

• Performance testing protocols

• Comparative evaluation with incumbent materials

• Troubleshooting support

K-80 calcined kaolin continues to set industry benchmarks for performance extenders in coating applications, offering formulators an optimal balance between technical performance and cost efficiency. Its unique combination of properties makes it particularly valuable in today's market where both quality and sustainability are paramount considerations.

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