This paper describes the development of a common Nordic test method for the evaluation ofhydrophobic impregnations for concrete, for protection against chloride ingress. The first stage of theexperimental campaign served to evaluate the influence of the precondition environment before surfacetreatment, curing time and type of surface on the performance of the impregnation agent. In the secondstage, a round robin test involving 3 Nordic laboratories was conducted; the results showed very littlevariation and were compared to results obtained according to previous standards in order to defineperformance requirements. Finally, data from field exposed specimens for more than 5 years was used tovalidate the suitability for use.