Calcium stannate (CaSnO₃) is an inorganic compound with a perovskite-type crystal structure. It is typically a white or off-white powder. Its synthesis often involves solid-state reactions between calcium and tin precursors at high temperatures. The primary application of calcium stannate is as a functional ceramic material and a precursor for electronic ceramics, including dielectric and piezoelectric components. It is also investigated as a promising anode material for lithium-ion batteries due to its high theoretical capacity and good structural stability during cycling. Additionally, it finds use as a flame retardant and smoke suppressant additive in polymers and plastics. As a functional material, its properties are highly dependent on synthesis methods and particle morphology. It is generally considered stable but should be handled with standard precautions for fine inorganic powders to avoid inhalation.