As titanium dioxide (TiO₂) markets become increasingly complex with new producers, grades, and sustainability claims, distinguishing premium products has never been more critical. This guide provides actionable criteria to evaluate TiO₂ quality, ensuring optimal performance and value for your formulations.
1. Key Quality Indicators
A. Chemical Properties
✔ TiO₂ Content: ≥94% for rutile-grade (≥92% for anatase).
✔ Impurity Levels:
- Iron (Fe): <50ppm (critical for whiteness).
- Heavy Metals: <10ppm (meets REACH/EPA standards).
✔ pH Value: 6.5–8.5 (ensures compatibility with resins).
B. Physical Properties
✔ Particle Size Distribution: 0.2–0.3μm (narrow distribution = better opacity).
✔ Oil Absorption (OA): 16–20g/100g (lower OA improves dispersion).
✔ *Brightness (L value)**: ≥98.5 (measured by HunterLab/CIE standards).
C. Performance Metrics
✔ Hiding Power (Opacity): ≥98% contrast ratio (ASTM D2805).
✔ Weather Resistance: >1,500h QUV B test without chalking.
✔ Dispersibility: Hegman grind ≥6.5 (minimizes processing energy).
2. Certification & Compliance
- ISO 9001: Quality management certification.
- ECOCERT/GREENGUARD: Low-VOC and eco-label certifications.
- REACH/FDA: Compliance for European and food-contact applications.
3. Supplier Evaluation Checklist
✅ Production Process: Chloride-process generally superior for high-purity applications.
✅ Technical Support: On-demand formulation assistance.
✅ Supply Chain Transparency: Traceability from mine to product.
✅ Sustainability Credentials: Carbon footprint <3t CO₂/t TiO₂ (chloride process).
4. Red Flags to Avoid
X Inconsistent Batch Quality: Request Certificates of Analysis (CoA) for 3+ batches.
X Overly Low Prices: Often indicates high impurities or outdated production.
X Lack Testing Data: Refusal to provide technical datasheets or samples.
5. 2025-Specific Considerations
- Digital Documentation: QR codes on packaging for real-time CoA access.
- ESG Metrics: Prioritize suppliers with published water/energy reduction targets.
- Regional Policies: Ensure compliance with EU CBAM and China Dual Carbon policies.
6. Practical Procurement Tips
- Request Samples: Test in your actual formulations.
- Audit Suppliers: Visit production sites if possible.
- Negotiate Long-Term Contracts: Lock in pricing with quality clauses.
Conclusion
Identifying premium TiO₂ requires scrutiny of technical specs, certifications, and supplier capabilities. Investing in quality upfront prevents costly rework and ensures end-product excellence.
Source with Confidence
Post time: Aug-27-2025