TiO2 fundamentals — science, applications, regulations, trade
30 technical articles for formulators, procurement teams, and regulatory specialists working with titanium dioxide. Written by our technical team; updated as standards and best practices evolve.
Science
Crystal forms, particle physics, surface chemistry, optical properties
The two TiO2 production routes have different particle physics and different economics. Choose based on application and cost sensitivity.
Rutile and anatase are TiO2's two main crystal forms. Different optics, different durability, different applications.
TiO2 particle size sets opacity — too small and particles don't scatter light effectively, too large and you waste material.
Surface treatment determines whether TiO2 disperses cleanly in your formulation and how durable the final product is — often more important than the base TiO2 itself.
TiO2's hiding power comes from its exceptionally high refractive index — the highest of any white pigment. Here's the optics.
TiO2 absorbs UV light and generates reactive radicals — a problem for outdoor coatings (chalking), but useful for self-cleaning surfaces.
Every TiO2 CoA reports CIE L*, a*, b* values. Here's how to read them and compare grades meaningfully.
Tinting strength quantifies how much hiding power a TiO2 grade delivers per kg. The Reynolds number is the industry standard metric.
Application engineering
Practical formulation guides for paint, plastics, ink, paper, rubber, cosmetics, powder
TiO2 is paint's most expensive component. Optimizing dosage — without losing hiding power — directly improves margin.
Outdoor PVC service life is set by the TiO2 + UV absorber package. Get this wrong and your window frame chalks in 18 months.
Poor TiO2 dispersion in masterbatch shows up as fish-eye defects in film, nozzle deposits in injection molding, and screen blinding in extrusion. Here's how to get it right.
Ink TiO2 must reach Hegman 7+ in 30–60 minutes of bead-milling. Here's how to set up the process.
TiO2 in paper is expensive — and easily lost to white water if retention isn't managed. Cationic retention aids are essential.
White rubber compounds use TiO2 for opacity. Crystal hardness, surface treatment, and antioxidant compatibility drive grade selection.
Nano TiO2 in sunscreen requires pre-dispersion, careful emulsion engineering, and regulatory compliance. Here's the practical guide.
Powder coating TiO2 must survive 100–130°C extrusion + 180–200°C cure without yellowing. Premium chloride rutile is the standard.
Regulations & safety
REACH, EU classification, FDA, cosmetic safety, reef-safe sunscreen, heavy metals
The EU's 2022 TiO2 classification as a Category 2 carcinogen (inhalation route) created compliance complexity — but only affects respirable powder forms.
Titanium dioxide is REACH-registered as an existing substance. All EU imports require registration coverage — typically provided by the supplier.
The EU banned TiO2 as a food additive (E171) in 2022. The ban applies to direct food use but does NOT extend to food packaging.
TiO2 is approved as a colorant for plastics in food-contact applications under FDA, EU, and most national regulations. Migration testing is sometimes required for high-loading applications.
Nano TiO2 in cosmetics is extensively reviewed and approved for use in non-spray products. Sprays are restricted due to inhalation risk.
Reef-safe sunscreen regulations ban specific organic UV filters (oxybenzone, octinoxate) but explicitly permit physical filters including nano TiO2.
Heavy metal limits for TiO2 vary by application and jurisdiction. Modern tier-1 TiO2 (including SEMITI) meets the strictest pharmacopeia limits.
Trade & procurement
Incoterms, container shipping, lead times, payment terms, CoA, qualification, market outlook
Incoterms allocate cost and risk between seller and buyer. Choose based on your in-house logistics capability and risk appetite.
TiO2 ships in standard 20' or 40' ocean containers. FCL (full container) is the default; LCL (consolidated) works for samples and small orders.
Total order-to-arrival time for TiO2 from China ranges from 18 days (Vietnam) to 50+ days (Brazil). Plan inventory accordingly.
Standard payment terms for TiO2 trade range from 100% TT advance (lowest risk for seller) to LC 90-day (more risk-sharing). Choose by relationship and country.
The CoA is your evidence that the TiO2 batch matches spec. Here's how to read every line and verify quality.
Don't ship 20 tons before validating in your specific formulation. Here's the standard 4-stage qualification approach.
TiO2 market in 2026 — Chinese capacity dominance continues, EU/US capacity rationalization, recovery in construction-driven demand.