Overview
High opacity titanium dioxide (TiO2) is a specialized form of titanium dioxide engineered for superior light-scattering efficiency, making it indispensable in industries requiring bright whites and opacity. It is produced via the chloride or sulfate process, with rutile-grade TiO2 being the preferred choice for high-opacity applications due to its higher refractive index (2.7) compared to anatase. The pigment’s performance is further enhanced by surface treatments like silica or alumina coatings, which improve dispersibility and durability in end products. Globally, China is the largest producer of titanium dioxide, accounting for over 40% of supply. Key manufacturers include Chemours, Tronox, and Lomon Billions. The product is classified under HS code 3206.11 for trade purposes and is subject to regional regulations such as REACH in the EU and EPA standards in the US.
Physical and Chemical Properties
High opacity TiO2 exhibits a tetragonal crystal structure (rutile phase) that maximizes light refraction. Its opacity is quantified by the scattering coefficient (typically >2,000 m²/kg), which surpasses conventional TiO2 grades. The pigment is thermally stable up to 1,800°C and inert to most acids/bases except hydrofluoric acid. Its UV absorption peaks at 380 nm, making it effective for sun protection in coatings and plastics. Particle size distribution (0.2–0.3 µm) is critical for performance; narrower distributions yield higher opacity. Surface treatments like zirconia or organic modifiers may be applied to tailor compatibility with specific polymer matrices (e.g., PVC or polyolefins) or solvent-based systems.
Main Applications
In coatings, high opacity TiO2 enables thinner films with equivalent hiding power, reducing material costs by up to 20%. It dominates architectural paints (especially exterior grades) and automotive finishes where weatherability is paramount. Plastics applications include PVC profiles (12–15% loading) and food packaging films (FDA-compliant grades). The ink industry relies on it for premium flexographic and gravure inks, achieving ISO brightness >95%. Emerging uses include ceramic glazes (5–10% addition) and lithium battery separators (as a UV blocker). In cosmetics, micronized TiO2 (nanoparticle-free) is used for SPF enhancement in sunscreens.
Safety and Storage
TiO2 dust poses a Category 2 inhalation hazard per IARC (though not classified as carcinogenic via inhalation in most jurisdictions). Workplace exposure limits are typically 10 mg/m³ (total dust) and 5 mg/m³ (respirable fraction). Storage requires humidity control (<50% RH) to prevent caking; bulk bags should be stacked no more than 5 layers high. For transportation, TiO2 is classified as a non-hazardous material (UN 3077) but requires dust-proof containers. Spills should be cleaned with vacuum systems—never dry sweeping. Firefighting requires Class D extinguishers for titanium dust fires, though TiO2 pigment itself is non-combustible.
B2B Procurement Guide
Specify parameters: rutile content (>95%), oil absorption value (16–20 g/100g), and pH (6.5–8.5). For coatings, check ASTM D476-00 compliance; plastics require ISO 591 Type R2 certification. Key suppliers include Venator (Huntsman legacy brand) and Kronos for chloride-process TiO2. Bulk purchases (20+ tons) typically secure 5–8% discounts. Consider regional production: Chinese TiO2 (e.g., CNNC Hua Yuan) is cost-competitive but may face anti-dumping tariffs in some markets. Sample testing should include opacity comparisons using contrast ratio tests (ASTM D2805) and dispersion stability checks in your specific formulation.
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