Abstract: In a method for manufacturing alkalimonofluorophosphate of general formula M.sub.2 PO.sub.3 F(I), where M stands for the cation of a metal of the first main group of the periodic system, in particular potassium, a reaction mixture containing alkali metal cations M, phosphate, fluoride, particularly in the form of alkali hydroxide, phosphoric acid and hydrofluoric acid, and water, the molar ratio of M:P:F being (2.+-.0.1):(1.+-.0.05):(1.+-.0.1) and the molar ratio of water:P being at least 1:1, is heated to a temperature of 150.degree. C. to 400.degree. C. Alkalimonofluorophosphate of general formula (I) occurs, with evaporation of water, as a reaction product, which is then isolated.

Abstract: A wood preservative based on leaching-resistant, inorganic compounds for protection of wood and wood materials against wood-damaging insects and fungi, including wood-rot fungi, is disclosed. The wood preservative, which is fixed without chromium, contains as active ingredient in an aqueous solution which is stable on impregnation, (a) a Cu(II), Zn, Ni, Co, Fe, Mg and/or Mn salt of monofluorophosphoric acid, or (b) an alkali metal salt and/or ammonium salt of monofluorophosphoric acid, in the presence of a Zn, Ni, Co, Fe, Mg and/or Mn salt of hydrochloric, nitric or sulfuric acid and, optionally in addition to (a) or (b), one or more members of the group comprising NH.sub.3, HCl, HNO.sub.3, H.sub.2 SO.sub.4, HF, alkali metal hydrogen fluoride and ammonium hydrogen fluoride. Alternately, the composition contains (c) an alkali metal salt and/or ammonium salt of monofluorophosphoric acid in the presence of a Cu(II) salt of hydrochloric, nitric or sulfuric acid in a Cu.sup.2+ :PO.sub.3 F.sup.