二氧化钛的相对密度随其结晶形态、粒径大小、化学组分、特别是与表面处理量大小有关，在制造过程中，随煅烧温度的提高和煅烧时间的延长而增长。在常用的白色颜料中，二氧化钛的相对密度最小，同等质量的白色颜料，二氧化钛的表面积最大，颜料体积最高。锐钛型二氧化钛的相对密度3.8～3.9g/cm3，金红石型二氧化钛的相对密度为4.2～4.3g/cm3。
The relative density of titanium dioxide increases with the increase of calcination temperature and time in the manufacturing process. Among the commonly used white pigments, the relative density of titanium dioxide is the smallest, the surface area of titanium dioxide is the largest, and the volume of pigment is the highest. The relative density of anatase titanium dioxide is 3.8-3.9g/cm3, and rutile titanium dioxide is 4.2-4.3g/cm3.