Stabilized sodium percarbonate composition

A stabilized sodium percarbonate composition consisting essentially of particles of sodium percarbonate uniformly coated with a film of a hydrophobic liquid organic compound in an amount of from about 5 to about 10 weight percent, based on the weight of said sodium percarbonate particles, said hydrophobic liquid organic compound having a melting point below about 15.degree.C, a boiling point above about 100.degree.C, and being non-reactive to and being a non-solvent for sodium percarbonate and sodium perborate, said hydrophobic liquid organic compound forming a moisture-resistant coating film on said sodium percarbonate particles, said composition also containing from about 5 to about 20 weight percent of a fine powder of sodium perborate, based on the weight of said sodium percarbonate particles, said sodium perborate particles being of smaller size than said sodium percarbonate particles and being mixed in or adhered to said film.