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This European test standard specifies a method for the titration and determination of the phosphoric acid content of a hydroalcoholic solution for aerospace applications. This test method is relevant for the determination of total acidity and phosphoric acid content in a reactive thinner of a wash primer or in metal cleaners. This standard EN 4171 has been prepared by ASD-STAN, Technical Section "Non-metallic materials", with the participation of German experts of the Coatings and Coating Materials Standards Committee (NAB) and the Aerospace Standards Committee (NL).