White crystalline powder, odorless, insoluble in water and ethanol, decomposed in nitric acid and hydrochloric acid solution, completely decomposed in oxalic acid solution, insoluble in sulfuric acid, but heated together with dilute sulfuric acid, most of the calcium iodate is converted into calcium sulfate and iodic acid. Calcium iodate executive standard (HG-2418-93) Item index content (dry basis) % ≥ 95.0 Iodine content (I) ≥ 61.8 Arsenic (As) ≤ 0.0005 Heavy Metals(Pb)%≤ 0.001Chlorate Compliance with the provisions of the Acid Solubility Test Compliance with the provisions of the Acid Solubility Test