Titanium dioxide is usually the most expensive component in a white paint or masterbatch, so buyers naturally shop on price. The problem is that grades are not interchangeable, and the cheapest tonne frequently costs more per unit of hiding power delivered.
Rutile versus anatase
Rutile is the dense, thermodynamically stable crystal form with a refractive index around 2.7. That high refractive index is what scatters light and delivers opacity. Rutile typically offers 20 to 30 percent better hiding power per unit weight than anatase, and it is photochemically far more stable.
Anatase is softer, slightly bluer in tone, and photoactive. That photoactivity degrades organic binders, causing chalking in exterior paint. It is the reason anatase is largely confined to interior applications, paper and, deliberately, to photocatalytic products where the reactivity is the point rather than the problem.
Surface treatments do the real differentiating
Commercial rutile TiO2 grades carry inorganic coatings of alumina, silica or zirconia, plus organic treatments. These treatments control three things: durability, by shielding the binder from residual photoactivity; dispersibility, by helping particles separate rather than agglomerate; and compatibility with the specific resin system.
Heavier silica treatment gives maximum exterior durability, favoured in architectural and coil coatings. Lighter treatment gives higher gloss and better tint strength in interior systems. Plastics grades emphasise thermal stability through processing and low moisture pickup, since a coatings grade run through an extruder can cause porosity and yellowing.
Judging value properly
Compare cost per unit of opacity in the finished formulation, not price per tonne. A grade with better dispersibility develops more of its theoretical hiding power in real production, where dispersion energy and time are limited. Agglomerated pigment is bought and paid for but scatters no light.
Specifying to a supplier
State the application, the resin system, the process, whether exposure is interior or exterior, and the property that matters most: durability, gloss or tint strength. That is enough for a supplier to recommend correctly. Ask for a sample for a production trial before switching grades, and evaluate on finished film opacity rather than dry powder appearance.
MENA Industrial Supplies supplies rutile titanium dioxide from Dubai stock with certificates of analysis, and can arrange trial quantities before you commit.