Overview
Titanium dioxide (TiO2) is an inorganic compound renowned for its exceptional brightness and opacity. It exists in two primary crystalline forms: rutile and anatase, with rutile being more stable and widely used in industrial applications. The compound is chemically inert, non-toxic, and resistant to discoloration under UV exposure, making it indispensable in sectors requiring durable white pigments. First commercialized in the early 20th century, TiO2 replaced hazardous lead-based pigments in paints and coatings. Today, it accounts for over 70% of global pigment production. Its versatility extends to food-grade applications (E171) and sunscreen formulations, where it acts as a physical UV blocker.
Physical and Chemical Properties
TiO2 exhibits a high refractive index (2.7 for rutile), surpassing most white materials, which grants superior light-scattering capacity. This property, coupled with its chemical stability, ensures long-lasting whiteness and opacity in products. The rutile form is denser and more UV-resistant than anatase, which is preferred for photocatalytic applications due to its higher reactivity. The compound is thermally stable, with a melting point exceeding 1,800°C, and insoluble in water or organic solvents. Its photocatalytic activity under UV light is harnessed in self-cleaning coatings and air purification systems, though this requires careful formulation to prevent degradation of host materials.
Main Applications
In paints and coatings, TiO2 provides coverage, durability, and weather resistance, constituting 20–30% of typical formulations. Plastics manufacturers rely on it to enhance opacity and UV protection, especially in packaging and automotive parts. The paper industry uses it to achieve high brightness in premium grades, while cosmetics employ nano-sized TiO2 for sunscreens and makeup. Emerging applications include photovoltaic cells, where TiO2 layers improve light absorption, and construction materials like self-cleaning concrete. Food-grade TiO2, though controversial in some regions, is used as a whitener in confectionery and dairy products. B2B buyers should specify application-specific grades to optimize performance and compliance.
Safety and Storage
While TiO2 is generally considered low-risk, inhalation of fine powder can cause respiratory irritation, necessitating PPE like N95 masks in handling. The International Agency for Research on Cancer (IARC) classifies inhalable TiO2 particles as "possibly carcinogenic" (Group 2B), though risks are limited to occupational settings with prolonged exposure. Storage requires protection from moisture to prevent caking. Bulk shipments typically use 25-kg multilayer paper bags or 1-ton super sacks with polyethylene liners. Facilities should maintain relative humidity below 65% and avoid contamination with reducing agents, which may alter pigment properties.
B2B Procurement Guide
Key procurement criteria include crystalline form (rutile for durability, anatase for photocatalytic uses), purity (≥92% for industrial grades), and particle size distribution (0.2–0.3 μm for optimal scattering). Chloride-process TiO2 typically offers higher purity than sulfate-process variants. Major global suppliers include Chemours, Tronox, and Venator. Buyers should request SDS, REACH compliance documentation, and batch-specific certificates of analysis. Spot prices fluctuate with titanium ore (ilmenite/rutile) costs and energy tariffs. Long-term contracts with price adjustment clauses are advisable for large-volume purchasers.
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