This part of ISO 12224 specifies a coding system for the classification and designation of solid and flux cored solder wire, and the performance requirements to be met by flux cored wire and its constituents. Requirements for sampling, labelling and packaging are also specified. Annex A specifies a method for the solvent extraction of flux incorporated in flux cored solder wire. The solution so obtained may be used for testing purposes. Annex В specifies the method for measuring the mean diameter of flux cored solder wire. Annex С gives guidance on the test methods appropriate for the flux types incorporated in flux cored solder wire.