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Sodium percarbonate is a solid, white inorganic salt, which is an addition compound of hydrogen peroxide and sodium carbonate. Based on the molecular formula, the pure substance contains 32.5 % hydrogen peroxide and 67.5 % sodium carbonate. The marketed product contains approximately 28.7 % hydrogen peroxide, though. The substance’s relative density ranges from 2.01 to 2.16 g/cm3. The vapour pressure at 25 °C is negligible. The water solubility of sodium percarbonate is 140 g/L; it rapidly dissolves in water and dissociates to hydrogen peroxide and sodium carbonate. The octanol-water partition coefficient cannot be determined because sodium percarbonate is an ionisable, inorganic compound. The melting and boiling points of the substance cannot be determined because it decomposes when heated. The particle size is typically in the range of 250 to 1000 micrometre and the fraction of particles with diameters below 75 micrometre was <0.04 %.