This compound is used in the production of printed circuit boards. It’s also in flame retardant materials because it lowers the combustion temperature and increases the production of residues or chars. Ammonium sulfate activates yeast, so it helps to get industrially produced bread to rise, and it’s also a general-purpose food additive. Finally, it plays an important role in developing vaccines during the purification process. The DTap vaccine, which protects children from diphtheria, tetanus, and whooping cough, uses ammonium sulfate for this purpose