600 Mesh High Coverage Kaolin - Superior Performance for Industrial Coatings
600 Mesh High Coverage Kaolin represents a breakthrough in mineral-based additives for advanced industrial coatings. Engineered through precision grinding and surface modification technologies, this ultra-fine kaolin grade delivers unmatched opacity, durability, and cost-efficiency in protective and decorative coating systems. With a tightly controlled particle size distribution centered at 600 mesh (equivalent to 25–30 µm), this naturally occurring aluminosilicate clay [Al₂Si₂O₅(OH)₄] combines the benefits of mineral reinforcement with enhanced optical properties, making it an indispensable component for modern coating formulators.
Key Technical Specifications
- Particle Size: 600 mesh (97% passing 25 µm sieve)
- Brightness (ISO): 88–92%
- Oil Absorption: 35–45 g/100g (ASTM D281)
- pH Value: 6.5–7.5 (20% aqueous suspension)
- Specific Gravity: 2.58–2.63 g/cm³
- Loss on Ignition (LOI): ≤13% (1000°C)
- Residual Moisture: ≤1.0%
Performance Advantages
1. Superior Coverage & Opacity
The platelet-shaped kaolin particles create exceptional light scattering efficiency, achieving:
- Hiding Power Enhancement: 25–35% improvement vs. standard calcium carbonate fillers
- TiO₂ Extension: Reduces titanium dioxide demand by 15–20% while maintaining equivalent contrast ratio (ASTM D2805)
- UV Reflectivity: 85% solar reflectance in cool roof coatings (ASTM C1549)
2. Enhanced Coating Integrity
Kaolin’s structural properties contribute to robust film performance:
- Abrasion Resistance: Improves Taber abrasion values by 18–25% (ASTM D4060)
- Chemical Resistance: Withstands 500+ hours in 5% HCl/Salt Spray (ASTM B117/B368)
- Thermal Stability: Maintains integrity at continuous service temperatures up to 300°C
3. Rheological Control
The anisotropic particle geometry enables precise flow management:
- Anti-Sagging: Enables 500+ µm dry film thickness in single-pass applications
- Thixotropy Adjustment: Reduces syneresis by 40% in high-solids epoxy systems
- Settle Resistance: Achieves 12-month suspension stability (ASTM D869)
Strategic Industrial Applications
Protective & Marine Coatings
- Corrosion Protection: Forms barrier layers in epoxy/polyurethane systems, extending service life by 3–5 years in offshore environments
- Tank Linings: Redoves permeation rate to <0.1 g/m²/day in chemical storage tanks (NACE TM0174)
Architectural & Specialty Coatings
- Exterior Wall Systems: Enhures crack bridging up to 2.5 mm in elastomeric coatings
- Fire-Retardant Paints: Achieves Class A flame spread rating (ASTM E84) through endothermic decomposition
High-Temperature Coatings
- Industrial Equipment: Maintains adhesion at 250°C cyclic exposure in silicone-modified formulations
- Exhaust Systems: Provides thermal shock resistance in ceramic-filled coatings
Formulation Optimization Guidelines
Dispersion Protocol
- Premixing: Incorporate at 10–25% wt. during grind stage with polyacrylate dispersants
- Milling: Achieve Hegman fineness ≥6 using bead mill or high-speed disperser
- pH Adjustment: Maintain 8.0–9.0 with AMP-95 for optimal colloidal stability
Synergistic Combinations
- With TiO₂: 1:3 kaolin-to-pigment ratio maximizes opacity-cost balance
- With Talc: 70:30 blend improves anti-corrosion in zinc-rich primers
- With Wollastonite: Hybrid filler system enhances impact resistance by 30%
Sustainability & Compliance
- Low Carbon Footprint: 0.8 kg CO₂/kg vs. 2.5+ kg for synthetic fillers
- REACH & RoHS: Fully compliant with EU regulation (EC) No 1907/2006
- Circular Economy: 100% recyclable in coating sludge recovery systems
Packaging & Handling
- Moisture-Resistant Bags: 25 kg multi-layer kraft paper with PE lining
- Bulk Options: 1-ton super sacks with UV-protective outer layer
- Storage: 12-month stability in dry (<50% RH), ventilated environments
Why Choose 600 Mesh High Coverage Kaolin?
- Cost Efficiency: Delivers 150–200/ton raw material savings vs. premium TiO₂-extenders
- Process Flexibility: Compatible with waterborne, solvent-borne, and powder coating systems
- Technical Support: Custom particle size tailoring available (400–1250 mesh)
- Global Supply Chain: ISO 9001-certified production with regional stock hubs
From automotive undercoatings requiring stone chip resistance to chemical plant infrastructure demanding aggressive fluid protection, this engineered kaolin grade elevates coating performance across industries. Its unique balance of mineralogical purity and engineered morphology enables formulators to meet increasingly stringent durability, sustainability, and cost targets.
| Specification (mesh) | 600 |
| Silica content | 65 (%) |
| Processing type | Calcined Kaoline |
| Application | coating kaoline |
| Color | white |
| Mohs hardness | 3 |
| Aluminum content | 35 |
| Fire resistance | 1000 |
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