Lithopone
Lithopone: The Premium White Pigment for Industrial Applications
Lithopone is a high-quality white pigment composed of barium sulfate (BaSO4) and zinc sulfide (ZnS). Widely used in various industries, this versatile compound offers excellent opacity, brightness, and chemical stability. Our premium-grade lithopone meets the highest industry standards, ensuring superior performance in your manufacturing processes.
Key Specifications of Our Lithopone Product
- Chemical Formula: ZnS + BaSO4 (approximately 28-30% ZnS content)
- Appearance: Fine white powder
- Specific Gravity: 4.2-4.3 g/cm³
- Oil Absorption: 12-16 g/100g
- pH Value: 7.0-8.5 (10% aqueous suspension)
- Refractive Index: 1.84-1.92
- Particle Size: 0.3-2.0 microns (average 0.8 micron)
Technical Parameters Table
| Parameter | Standard Value | Testing Method |
|---|---|---|
| ZnS Content | ≥ 28% | Gravimetric Analysis |
| Brightness (ISO) | ≥ 95% | ISO 2470 |
| Heat Resistance | ≥ 300°C | Thermogravimetric Analysis |
| Water Solubility | ≤ 0.5% | ISO 787-3 |
| Sieve Residue (325 mesh) | ≤ 0.5% | ASTM D185 |
Lithopone Applications
The unique properties of lithopone make it ideal for various applications:
- Paints & Coatings: Provides excellent hiding power and durability
- Plastics: Enhances whiteness and UV resistance
- Rubber Products: Improves tensile strength and aging resistance
- Paper Industry: Used as filler and coating pigment
- Inks: Delivers bright white coloration
Lithopone FAQ Section
Q: What is the difference between lithopone and titanium dioxide?
A: While both are white pigments, lithopone (a combination of zinc sulfide and barium sulfate) offers different properties compared to titanium dioxide. Lithopone has slightly lower opacity but better dispersion properties in certain applications. It's also more economical than titanium dioxide while providing good brightness and whiteness. The choice depends on specific application requirements and budget considerations.
Q: Is lithopone safe for use in food-contact materials?
A: Our standard lithopone is not specifically approved for direct food contact. However, we offer special grades that meet relevant food contact regulations in various regions when properly incorporated into approved polymer systems. Always check local regulations and consider conducting migration tests for your specific application to ensure compliance with food safety standards.
Q: How should lithopone be stored for optimal shelf life?
A: Lithopone should be stored in a cool, dry place away from direct sunlight and moisture. Keep containers tightly sealed when not in use. Under proper storage conditions (temperature below 30°C and relative humidity below 65%), lithopone maintains its quality for at least 24 months. Avoid contamination with foreign materials, especially colored substances that could affect the whiteness of the product.
Quality Assurance
Our lithopone undergoes rigorous quality control testing throughout the manufacturing process. Each batch is tested for chemical composition, physical properties, and performance characteristics to ensure consistent quality. We maintain comprehensive quality documentation and can provide certificates of analysis upon request.
Environmental Considerations
Lithopone is classified as non-hazardous under normal conditions of use. However, as with all fine powders, proper dust control measures should be implemented during handling. Our manufacturing process incorporates environmental protection measures to minimize emissions and waste generation.
Packaging Options
We offer lithopone in various packaging configurations to meet different customer needs:
- 25 kg multi-wall paper bags with inner PE liner
- 500 kg or 1000 kg bulk bags (FIBC)
- Custom packaging available upon request
For more detailed technical information about our lithopone products or to request samples, please contact our technical support team who can assist with your specific application requirements.