| Kaolin Powder |
| Index Item | Unit | Executive Standards |
| Brightness | R457，％ | ≧93 |
| Particle size | —2µm，％ | 78±3 |
| Oil absorption | g/100g | 60±3 |
| Sieve residue (45µm) | ％ | ≤0.01 |
| PH Value | | 6.0-8.0 |
| Moisture | ％ | ≤0.8 |
| Volume density | g/cm³ | 0.4-0.6 |
| True density | g/cm³ | 2.65-2.75 |
| Parameter | Specification | Test Method |
|---|
| Product Name | Kaolin Z-90 (Calcined Kaolin) | – |
| Type | Calcined Kaolin / China Clay | – |
| Brightness (R457) | ≥93% | ISO 2470 |
| Particle Size (≤2µm) | 78±3% | Laser Diffraction |
| Oil Absorption | 60±3g/100g | ASTM D281 |
| Sieve Residue (45µm) | ≤0.01% | – |
| pH Value | 6.0-8.0 | ISO 787-9 |
| Moisture Content | ≤0.8% | ISO 787-2 |
| Bulk Density | 0.4-0.6 g/cm³ | – |
| True Density | 2.65-2.75 g/cm³ | Pycnometer |
| Appearance | Fine white powder | Visual Inspection |
| Packaging | 25kg woven bag | – |
| Storage | Cool, dry place away from moisture | – |
Kaolin Z-90 calcined kaolin is extensively used in various coating applications due to its excellent hiding power, gloss control, and cost-effectiveness.
Architectural Paints
- Interior and exterior wall paints
- Latex paints and emulsion coatings
- Mastic and textured coatings
- Primer and undercoat systems
Industrial Coatings
- Protective coatings
- Marine coatings
- Automotive refinish coatings
- Industrial maintenance coatings
Functional Benefits in Coatings
- Hiding Power: Platelet morphology enhances light scattering and opacity
- Gloss Control: Provides excellent gloss and sheen control in various coating systems
- TiO2 Extension: Partial titanium dioxide replacement (10-30% reduction) while maintaining opacity
- Film Formation: Improves film integrity and mechanical properties
- Barrier Properties: Enhances barrier properties against moisture and chemicals
- Cost Reduction: Significantly reduces formulation costs compared to pure titanium dioxide
Kaolin Z-90 is an excellent extender and functional filler for printing inks, providing improved printability, color development, and surface properties.
Flexographic Inks
- Water-based flexographic inks
- Solvent-based flexographic inks
- UV-curable flexographic inks
Gravure Inks
- Publication gravure inks
- Packaging gravure inks
- Industrial gravure inks
Screen Printing Inks
- Textile screen printing inks
- Industrial screen printing inks
- Graphics screen printing inks
Functional Benefits in Inks:
- Color Development: Enhances color strength and development
- Printability: Improves ink transfer and laydown on substrates
- Gloss Enhancement: Provides excellent gloss control in finished prints
- Viscosity Control: Contributes to stable viscosity and rheology
- Setoff Resistance: Reduces ink setoff in printing processes
- Surface Smoothness: Improves surface smoothness and print quality
Recommended Dosage:
- Flexographic inks: 3-10% by weight
- Gravure inks: 5-15% by weight
- Screen printing inks: 5-12% by weight
Packaging: 25kg woven bag
Remarks: The above data is for reference only. For specific applications, please contact the supplier. Product specifications are subject to the corresponding inspection report.
Q: What is the difference between calcined kaolin and hydrated kaolin?
A: Calcined kaolin undergoes thermal treatment at high temperatures (900-1000°C) to remove hydroxyl groups, which increases brightness, opacity, and develops platelet morphology. Hydrated kaolin retains water of hydration and has different properties. Calcined kaolin Z-90 offers superior brightness (≥93% R457) and hiding power compared to hydrated kaolin.
Q: How does Kaolin Z-90 compare to titanium dioxide in terms of hiding power?
A: While titanium dioxide provides superior hiding power per unit weight, Kaolin Z-90 can partially replace 10-30% of titanium dioxide while maintaining acceptable opacity. The platelet morphology of calcined kaolin contributes to light scattering and hiding power. For cost-sensitive applications, Kaolin Z-90 offers an excellent balance between performance and cost.
Q: What is the recommended dosage of Kaolin Z-90 for coatings?
A: For architectural coatings, recommended dosage is 5-15% by weight. For industrial coatings, 3-10% by weight is typical. For primer systems, 10-20% by weight is recommended. Always conduct preliminary trials to determine optimal dosage for your specific application and performance requirements.
Q: Is Kaolin Z-90 compatible with water-based and solvent-based systems?
A: Yes, Kaolin Z-90 is compatible with both water-based and solvent-based formulations. The low oil absorption (60±3g/100g) and stable pH (6.0-8.0) ensure good compatibility with various binder systems. However, always conduct compatibility testing with your specific formulation before large-scale use.
Q: Can Kaolin Z-90 be used in UV-curable coatings and inks?
A: Yes, Kaolin Z-90 can be used in UV-curable systems. The fine particle size and excellent dispersion characteristics make it suitable for UV-curable applications. However, ensure that the kaolin does not significantly affect UV cure depth or rate. Conduct preliminary trials to optimize formulation for UV curing systems.
Q: How should Kaolin Z-90 be stored to maintain product quality?
A: Store Kaolin Z-90 in a cool, dry place at 5-30°C (41-86°F) with relative humidity below 60%. Keep product in original, unopened packaging until use. Under these conditions, shelf life is 24 months. Re-seal opened packaging between uses to protect from moisture contamination.
Q: Do you provide samples of Kaolin Z-90 for testing?
A: Yes, we provide free samples (typically 1-2kg) for qualified customers upon request. We recommend testing samples in your specific application before placing bulk orders to ensure the product meets your requirements. Contact our sales team to request samples.
Q: What is the minimum order quantity (MOQ) for Kaolin Z-90?
A: Our minimum order quantity is typically 500kg (20 bags of 25kg each) for new customers. For larger orders and long-term cooperation, we offer competitive pricing and flexible terms. Contact our sales team for detailed pricing information based on your order volume.
Q: Is Kaolin Z-90 REACH and RoHS compliant?
A: Yes, Kaolin Z-90 calcined kaolin is REACH and RoHS compliant for European Union markets. We maintain comprehensive compliance documentation and can provide certificates upon request. Our products meet international quality and environmental standards.
Q: Can Kaolin Z-90 be used in combination with other extenders and fillers?
A: Yes, Kaolin Z-90 can be used in combination with other extenders and fillers such as calcium carbonate, talc, and barium sulfate. The combination of different fillers can optimize performance characteristics and cost-effectiveness. Conduct formulation trials to determine the optimal filler blend for your specific application.
