When it comes to plastics, choosing the right type of Titanium Dioxide (TiO₂) is not just about color. It also affects durability, UV resistance, transparency, and even the overall lifespan of the product. Different plastic applications call for different grades of TiO₂, mainly Rutile TiO₂ and Anatase TiO₂.
1. Main Types of Titanium Dioxide Used in Plastics
Rutile Titanium Dioxide (Rutile TiO₂)
Larger crystal size, tetragonal crystal structure.
Offers excellent hiding power, high gloss, and outstanding weather resistance.
Strong UV protection and higher thermal stability.
Widely used in outdoor plastics that require long-term durability.
Anatase Titanium Dioxide (Anatase TiO₂)
Smaller particle size, also tetragonal crystal structure.
Provides good dispersion and brightness, though with lower hiding power.
More suitable for indoor plastics, transparent or semi-transparent applications where high gloss is needed but extreme weather resistance is not required.
2. Selection Principles for Titanium Dioxide in Plastics
Outdoor Plastic Products (pipes, building profiles, outdoor furniture, garden products)
→ Best choice: Rutile TiO₂
→ Reason: Excellent UV resistance and weatherability, preventing fading and aging.
Indoor or Short-Term Use Plastics (packaging, stationery, toys)
→ Suitable options: Anatase TiO₂ or Rutile, depending on needs.
→ Reason: Lower durability requirements, focus on gloss and dispersion.
Transparent or Semi-Transparent Plastics (films, clear sheets, specialty packaging)
→ Best choice: Anatase TiO₂ or ultra-fine Rutile.
→ Reason: Small particle size ensures high clarity without reducing transparency.
High-Temperature Processed Plastics (polypropylene, polyester, engineering plastics)
→ Best choice: high-temperature-resistant Rutile TiO₂.
→ Reason: Maintains stability during extrusion or injection molding, avoids discoloration.
3. Summary
For most plastic products, Rutile Titanium Dioxide is recommended because of its high hiding power, superior weather resistance, and UV protection, making it ideal for long-term applications.
However, for indoor plastics, transparent films, or products with low durability demands, Anatase TiO₂ is a cost-effective option due to its excellent gloss and dispersibility.
When selecting Titanium Dioxide for Plastics, manufacturers should also consider particle size, surface treatment, and heat resistance to ensure smooth processing and stable product performance.