White powdery, strong hygroscopicity.After hygroscopic, it becomes sticky. It is easy to be wet in air and soluble in water. The solubility in water is higher, but the dissolution rate is slower. Readily hydrolyzed or formed into phosphite. To some metal ions (calcium, magnesium) have the ability to form or dissolve complex, it can be used to soften water, and lead, silver, barium salt can also form complex.
Application: For industrial use, such as oil field, paper-making, textile, dyeing, petrochemical industry, tanning industry, metallurgical industry and building material industry, it is mainly used as a water softening agent in solution for printing, dyeing, and boiler; Diffusant in papermaking; slow corrodent, floating agent, dispersing medium, high temperature agglomerant, detergent and soil analytical chemistry reagent. For food grade, it is mainly used as additive agent,pH adjusting agent and fermentation agent, and nourishment.