BS EN ISO 9455-5:2020 pdf free.Soft soldering fluxes一Test methods Copper mirror test. BS EN ISO 9455-5 This document specifies a qualitative method for assessing the aggressiveness of a flux towards copper. The test is applicable to all fluxes of type 1 as defined in ISO 9454-1.For flux samples in the form of a solid or paste, and for flux-cored solder,...