Diammonium hydrogen phosphate, is a kind of inorganic, molecular formula (NH4)2HPO4, molecular weight is 132.06, colorless transparent monoclinic crystal or white powder.

Widely used in printing plate, medicine, fire prevention, electronic tube, etc., is a widely used in vegetables, fruits, rice and wheat high-efficiency fertilizer, industrial used as feed additives, flame retardant and fire extinguishing agent ingredients.