Sodium hexametaphosphate is an inorganic substance in the form of white powder crystals or colorless transparent lumpy solids, also known as Graham’s salt. Sodium hexametaphosphate has a density of 2.181g/cm3 and a melting point of 616 degrees C. It is soluble in water and insoluble in organic solvents. It has strong hygroscopicity, and when placed in the air, it will be viscous due to absorbing too much moisture in the air. It can be used to process food, enhance the water holding capacity of food, prevent fat oxidation, and prevent the role of soy sauce and other food discoloration. It can also be used in industry to manufacture sodium monofluorophosphate by heating with sodium fluoride, and as a water softener. However, sodium hexametaphosphate should not be used casually in life, as it can cause serious poisoning such as shock and cardiac arrhythmia when accidentally taken. If poisoning occurs, it should be sent to hospital immediately for medical treatment.