Talc at room temperature is a white powder, with a certain degree of smoothness and stability, its density of about 2.7g/cm³, melting point of 1390 ℃, heated to 800 ℃ above the decomposition of magnesium oxides and silica. In addition, the particle size of talcum powder is usually between 1-20 microns, with good dispersibility and plasticization, plays an important role in paper.