Calcium diiodate is white crystal or powder, odorless. Melting point 540 ℃ (decomposition); slightly soluble in water, insoluble in alcohol, soluble in nitric acid, the relative density of 4.52 (15 ℃, water = 1). Chemical stability.
Calcium iodate is sensitive to the reductant. Mixture with combustibles by impact, friction caused by fire, explosion. Contact with aluminum, arsenic, carbon, copper, metal sulfides, reducing agents, phosphorus, sulfur or organic compounds to form explosive mixtures.