The relative density of titanium dioxide is related to its crystalline form, particle size, chemical composition, especially the size of surface treatment. During the manufacturing process, the relative density of titanium dioxide increases with increasing calcination temperature and calcining time. In common white pigments, titanium dioxide has the smallest relative density. Among the same quality of white pigment, titanium dioxide has the largest surface area and the highest paint volume. The relative density of anatase titanium dioxide is 3.8 ~ 3.9 g/cm3, and the relative density of rutile titanium dioxide pigment is 4.2 ~ 4.3 g/cm3.