FAQs about Titanium Dioxide

Q1: What is the difference between titanium dioxide and lead powder? Which one is better?

A: Titanium dioxide (TiO₂) and lead powder (ZnS·BaSO₄) are two commonly used white pigments. Titanium dioxide is significantly better than lead powder in hiding power (34 times higher), whiteness, weather resistance, etc., but the cost is also higher. Lead powder has advantages in alkali resistance and price. The choice depends on the specific application and cost considerations.

Q2: How to judge whether titanium dioxide has deteriorated due to moisture?

A: Moisture-affected titanium dioxide will show the following signs: ① Severe caking and difficult to disperse; ② Significant decrease in fluidity; ③ The color may slightly darken; ④ In applications such as coatings, the dispersibility becomes worse and particles may appear. Slightly damp products can be restored through proper drying treatment, but severe caking should be scrapped.

Q3: What is the specific difference between food grade titanium dioxide and industrial grade?

A: The main differences are: ① Purity requirements: food grade heavy metal content is extremely low (such as lead

Q4: Is titanium dioxide safe in sunscreen?

A: Current research shows that titanium dioxide that meets cosmetic specifications is safe to use in sunscreen products. Key points: ① When using nano-level products, the surface must be properly treated; ② It will not penetrate healthy skin; ③ Compared with some chemical sunscreens, titanium dioxide has a lower risk of causing allergies. However, inhalation of powder form should be avoided.

Q5: Can titanium dioxide that has been stored for many years still be used?

A: It depends on the storage conditions: ① Titanium dioxide that is well sealed and properly controlled in the environment can still be used even if it is stored for 23 years, but the performance needs to be tested; ② For products that have been opened or stored in poor conditions, it is recommended to conduct a comprehensive application performance test; ③ Surface-treated products usually have a shorter storage period, and the dispersibility may be affected after expiration.

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