Potassium persulfate, KSO, is composed of white crystals that are soluble in water, and it decomposes below 212F (100C). Potassium persulfate is a dangerous fire risk in contact with organic materials. It is a strong oxidizing agent and an irritant, with a four-digit UN identification number of 1492. The primary uses are in bleaching, as an oxidizing agent, as a antiseptic, as a polymerization promoter, and in the manufacture of pharmaceucals