Sodium pyrophosphate as a white powder or crystal. The relative density of 2.534, soluble in water. The disodium hydrogen phosphate formed by melt water pyrophosphate dehydrated, soluble in water crystallization in the system. Widely used in food, electroplating, printing and dyeing, paper making, daily chemical and other industries. Used as a hair bleaching agent, dispersing agent, emulsifier, quality modifier, buffer, chelating agents and so on.