Used as a flame retardant in plastics and rubber materials due to its ability to suppress combustion. Also serves as a precursor in the synthesis of barium-containing ceramics and electronic components. Employed in pyrotechnics to produce green-colored flames in fireworks and signal flares. Acts as a stabilizer in some polymer systems, improving thermal stability during processing. Occasionally used in laboratory settings as a reagent for precipitation reactions involving barium or oxalate ions.