597919 Disclosed herein is a method for treating wood in order to improve its properties of use and storage, and to thus obtained treated wood product wherein said treated wood product comprises formate at least 0.1 % by weight. In the method the wood to be treated is contacted with a treatment composition comprising monoester, diester or triester or a mixture thereof formed by a water soluble C1-C1O alcohol and formic acid as an equilibrium solution. In addition, the invention relates to specific treatment solution compositions which comprises of 1-99 % by weight glyceryl formate, free formic acid, glycerol and water, and a chelating agent which comprises phosphonic acid or a salt thereof, and a hydrophobicity rendering agent.
