Silica sol is a system in which amorphous silica is dispersed in an aqueous solution, and its molecular formula is mSiO2.nH2O, in which SiO2 is uniformly dispersed in water in the form of micelles to form a silicic acid polymer solution. Appearance is mostly milky white or light blue solution, non-toxic and harmless, no pollution to the environment. Not explosive, not dangerous goods.