This part of ISO 9454 specifies the performance requirements for fluxes in solid, liquid and paste forms intended foruse with soft solders.NOTES1 ISO 9454-1 specifies the requirements for labelling and packaging as well as the coding system for the classification of thefluxes.2 Some of the fluxes intended for inert gas and vapour phase soldering may not pass some of the criteria in tables 1 and 2.Requirements for these fluxes should be agreed between the purchaser and the supplier.