Overview
Titanium Dioxide Pigment, or titanium white, is the most widely used white pigment globally due to its exceptional brightness and high refractive index. It is derived from naturally occurring titanium minerals and processed into fine powder for industrial use. The pigment is chemically inert, making it suitable for diverse applications. Two primary forms exist: rutile and anatase. Rutile TiO2 offers higher opacity and UV resistance, while anatase is preferred for applications requiring a bluer undertone. Both forms are indispensable in industries requiring whiteness, opacity, and durability.
Physical and Chemical Properties
Titanium dioxide is a stable compound with a high melting point (1843°C) and boiling point (2972°C). Its density of 4.23 g/cm³ contributes to its excellent covering power. The pigment is insoluble in water and most organic solvents, ensuring long-term stability in formulations. Key properties include high refractive index (2.7 for rutile), which enhances opacity, and UV absorption capability, making it valuable in sunscreens and outdoor coatings. Its chemical inertness prevents reactions with binders or substrates, ensuring consistent performance.
Main Applications
The largest application of titanium dioxide pigment is in the coatings industry, where it provides whiteness and opacity to paints, varnishes, and lacquers. In plastics, it improves brightness and weather resistance for products like PVC pipes and packaging materials. Other significant uses include paper manufacturing (for high-quality printing), cosmetics (sunscreens, foundations), and ceramics (glazes). Specialty grades are also employed in food-grade applications and pharmaceuticals, though stringent purity standards apply.
Safety and Storage
While titanium dioxide is generally considered non-toxic, inhalation of fine powder should be avoided. Use NIOSH-approved dust masks and ensure proper ventilation in workplaces. Skin contact may cause mild irritation; gloves are recommended. Store in sealed containers away from moisture and direct sunlight to prevent clumping. Bulk storage should be in dry, well-ventilated areas. Follow local regulations for disposal, as it is not biodegradable but poses minimal environmental risk.
B2B Procurement Guide
When procuring titanium dioxide pigment, specify the grade (rutile or anatase) and surface treatment (alumina, silica, or organic). Key parameters include purity (typically 92-99%), particle size (0.2-0.3 microns for optimal scattering), and oil absorption value. Verify supplier certifications like ISO 9001 and REACH compliance. For large orders, request batch testing reports. Consider freight costs, as TiO2 is heavy; regional producers may offer better pricing. Negotiate based on volume and long-term contracts.
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