This part of ISO 9455 specifies three quantitative methods for the determination of the ionic halide (excluding fluoride) content of soldering fluxes. Halides are calculated as chlorides. A useful qualitative test method for the detection of ionic halides is also described. Method A is a Potentiometrie titration method for the determination of halide (excluding fluoride) content and is applicable to flux classes 1 and 2, defined in ISO 9454-1. This method, which is to be considered the reference method for these fluxes, is suitable for halide contents generally within the range 0,05 % (m/m) to 2 % (m/m) in the non-volatile matter of the flux. Method В is a titration method for the determination of the total halide (excluding fluoride) content of water-soluble fluxes. It is applicable to flux classes 2.1.2.A and 3.1.1 .A, as defined in ISO 9454-1. Method С is a titration method for the determination of the halide (excluding fluoride) content of water-soluble fluxes containing phosphates and is applicable to flux class 3.2.1.A, as defined in ISO 9454-1. Method D is a qualitative test, using silver Chromate test paper, for the presence of ionic halides. The technique may be used for all classes of flux.