This part of ISO 9455 specifies a method for the assessment of the efficacy of a soft soldering flux, known as the wetting balance method. It gives a qualitative assessment of the comparative efficacy of two fluxes (for example, a standard and a test flux), based on their capacity to promote wetting of a metal surface by liquid solder. The method is applicable to all flux types in liquid form classified in ISO 9454-1.
NOTE It is hoped that future developments using improved techniques for obtaining a reproducible range of test surfaces will enable this method for assessing flux efficacy to be quantitative. For this reason several alternative procedures for preparing the surface of the test piece are included in the present method.
ISO 9455-16:1998 history
2019ISO 9455-16:2019 Soft soldering fluxes — Test methods — Part 16: Flux efficacy test, wetting balance method
2013ISO 9455-16:2013 Soft soldering fluxes - Test methods - Part 16: Flux efficacy test, wetting balance method
1998ISO 9455-16:1998 Soft soldering fluxes - Test methods - Part 16: Flux efficacy tests, wetting balance method