Perchlorate
Perchlorates are the salts derived from perchloric acid (HClO4). Perchlorates are often produced by natural processes but can also be produced artificially. They have been used for more than fifty years to treat thyroid disorders. They are used extensively within the pyrotechnics industry, and ammonium perchlorate is also a component of solid rocket fuel. Lithium perchlorate, which decomposes exothermically to produce oxygen, is used in oxygen "candles" on spacecraft, submarines, and in other situations where a reliable backup oxygen supply is needed. Most perchlorates are soluble in water, except for potassium perchlorate which has the lowest solubility of any alkali metal perchlorate (1.5 g in 100 mL of water at 25 °C).
Read more about Perchlorate: Chemical Definition, Reactivity As An Oxidant, Environmental Presence, Regulatory Issues, Biological Functions, Discovery of Perchlorate On Mars