Kaolin 6000mesh K-90 Super Fine Clay for Paper Coating

Product Overview
K-90 represents an advanced grade of fine calcined kaolin specifically engineered for high-performance paper coating applications. This anhydrous aluminum silicate (Al₂SiO₅) powder undergoes precise thermal treatment and particle size optimization to deliver exceptional optical and printing performance characteristics in paper manufacturing processes.

Manufacturing Process

• Controlled calcination at 1000-1100°C for optimal crystal structure development

• Multi-stage air classification achieving precise particle size distribution

• Advanced surface modification for enhanced fiber bonding

• Continuous quality monitoring throughout production

Key Technical Specifications

• Whiteness Index: 95-97% (ISO brightness)

• Particle Size Distribution:

  • D50: 0.8-1.2μm

  • D90: <3.5μm

  • +325 Mesh: ≤0.005%

• Viscosity: 300-500 cP (60% solids)

• Specific Surface Area: 15-20 m²/g (BET method)

• Refractive Index: 1.62

Chemical Composition

• SiO₂: 52-54%

• Al₂O₃: 44-46%

• Fe₂O₃: ≤0.3%

• TiO₂: ≤0.2%

• LOI (1000°C): ≤0.5%

Performance Benefits in Paper Manufacturing

• Optical Enhancement:

  • Increases sheet brightness by 3-5 points

  • Improves opacity by 15-20%

  • Enhances surface smoothness (PPS ≤1.0μm)

• Printing Performance:

  • 20-30% improvement in ink receptivity

  • Reduced print mottle and picking

  • Excellent dot reproduction (150-200 lpi)

• Process Advantages:

  • High shear stability in coating color

  • Excellent water retention properties

  • Reduced dusting during converting

Technical Comparison with Conventional Fillers
| Property | K-90 | Standard Kaolin | GCC |
|----------|------|----------------|-----|
| Brightness Improvement | +4.5 | +2.0 | +1.5 |
| Opacity Enhancement | +18% | +10% | +8% |
| Ink Absorption | Excellent | Good | Fair |
| Coating Viscosity | Optimal | High | Low |
| Cost-Performance Ratio | Superior | Good | Moderate |

Mechanism of Action

• Plate-like particle structure creates optimal light scattering

• Surface chemistry promotes uniform ink film formation

• Particle size distribution ensures smooth coating layer

• High purity minimizes interference with optical brighteners

Recommended Application Parameters

• Coating Formulations: 20-40% by weight

• Base Paper Types: LWC, MWC, Art papers

• Coating Weight: 8-15 gsm per side

• Binder Systems: Compatible with SB latex, starch, PVOH

Sustainability Features

• 20% reduction in energy consumption versus alternative processes

• Enables reduced fiber content without quality compromise

• REACH compliant

• Biodegradable and non-toxic

Quality Assurance

• ISO 9001:2015 certified production

• ISO 14001 environmental management

• Batch-specific quality certificates

• Full traceability from mine to product

Packaging & Logistics

• 1-ton bulk bags with moisture barrier

• 25kg multi-wall paper bags

• Dedicated paper-grade silo trucks

• 24-month shelf life in controlled conditions

Technical Support Services

• Coating color formulation assistance

• Pilot coating trials available

• Printability testing protocols

• Mill troubleshooting support

K-90 calcined kaolin has become the material of choice for paper manufacturers seeking to optimize both quality and production efficiency. Its unique combination of optical properties, printing performance, and process characteristics makes it particularly valuable in today's competitive paper markets where premium quality and sustainability are key differentiators. Ongoing technical support ensures optimal implementation for each specific application requirement.