Water-insoluble inorganic borates with different formulations were prepared through the aqueous double decomposition reaction and used to treat wood samples in this study.The leaching rates of boron from the samples under different inorganic borate formulations were determined according to the American Wood Protection Association standard of AWPA E11-06.The results showed that boron leaching rates from different formulations were considerably different.For water-soluble borates,boron leaching rates from treated samples were between 83.2% and 96.8%.However,the organic solvent-based oleic acid treated samples only showed a 2.7% boron leaching rate.