Hardness: According to the Mohs hardness scale of 10 points, rutile titanium dioxide is 6-6.5, anatase titanium dioxide is 5.5-6.0, so anatase is used in chemical fiber matting to avoid abrasion of spinneret holes.
Melting point and boiling point: Since both anatase and brookite type titanium dioxide will transform into rutile type at high temperature, the melting point and boiling point of brookite type and anatase type titanium dioxide do not actually exist. Only rutile titanium dioxide has a melting point and boiling point. The melting point of rutile titanium dioxide is 1850°C, the melting point in air is (1830±15)°C, and the melting point in oxygen enrichment is 1879°C. The melting point is related to the purity of titanium dioxide. The boiling point of rutile titanium dioxide is (3200±300)K, and titanium dioxide is slightly volatile at this high temperature.
