white amorphous powder, light quality. The original particle size 0.3μ m below. The relative density is 2.319 to 2.653. The melting point is 1750 degrees centigrade. After absorbing the tide, the fine particles are formed. It has very high insulation. Insoluble in water and acid; soluble in caustic soda and hydrofluoric acid. The high temperature does not decompose. Water absorbability. The matrix and active ingredients and additives show chemical inertness. It has good compatibility with vitamins, hormones, fluoride, antibiotics, enzyme preparations and many active ingredients commonly used in cosmetics. Because of its porosity and large specific surface area, it has greater dispersion in raw rubber. The high