Silica Main physical and chemical properties 

Silica, also known as light silica, has a scientific name of precipitated hydrated silica. Is a high-tech inorganic fine chemical product, the main ingredient is SiO2. The performance is similar to carbon black. The appearance is white highly dispersed amorphous powder or floc powder, and it is also processed into granules as a commodity. Light weight, the original particle size is less than 0.3μm, the relative density is 2.319 ～ 2.653, the melting point is 1750 ℃, it is insoluble in water and most acids, has water absorption, and will become aggregated fine particles after absorbing water in the air. Soluble in caustic soda and hydrofluoric acid. Stable to other chemicals, resistant to high temperatures without decomposition and non-combustion. It shows chemical inertness to matrix and active ingredients and additives, and has good compatibility with many active ingredients commonly used in vitamins, hormones, fluorides, antibiotics, enzyme preparations and cosmetics. Has high electrical insulation. Due to its porosity and large specific surface area, it has a large dispersing power in the raw rubber, and it shows high reinforcement when filled in rubber. The surface-modified hydrophobic white carbon black is easily soluble in oil and used as a reinforcing filler in rubber and plastics, which will significantly improve the mechanical strength and tear resistance of its products. Due to different manufacturing methods, the physical and chemical properties and microstructure of white carbon black will be different, so their application fields and application effects are also different.