BS EN ISO 9455‑5:2020 pdf download.Soft soldering fluxes — Test methods.
1 Scope
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.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 9455‑1, Soft soldering fluxes — Test methods — Part 1: Determination of non-volatile matter,
gravimetric method
ISO 9455‑2, Soft soldering fluxes — Test methods — Part 2: Determination of non-volatile matter,
ebulliometric method
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
4 Principle
For flux samples in the form of a solid or paste, and for flux-cored solder, a flux test solution containing 25 % (m/m) of solids is prepared. For liquid flux samples, the liquid is used full strength as the flux test solution. The flux test solution is then evaluated in terms of its attack on a copper film previously vacuum deposited onto a glass plate (copper mirror). A rosin reference solution, which should not cause removal of the copper film, is used as a control. The object of the test is to determine the flux reactivity due to the presence of free halide activators.
NOTE The presence of amines in the flux can cause misleading results in that the flux appears to pass the test, when in fact it has a highly reactive composition.
5 Reagents
Use only reagents of recognized analytical grade and only distilled, or deionized, water.
5.1 Acetone.
5.2 Propan-2-ol.
7.1.3.2 Determine the non‑volatile matter content of the extract using the method in ISO 9455‑1 or ISO 9455‑2, and adjust the content by evaporation or by dilution with propan‑2‑ol (see 5.2, but see also 7.1.2.2) to 25 % by mass to produce the flux test solution.
7.2 Preparation of copper mirrors for test
Select two copper mirrors (see 6.2) free from visible defects. Immediately before carrying out the test in 7.3, immerse the copper mirrors in the EDTA (see 5.5) for not more than 5 s, to remove any copper oxide. Rinse immediately in running water, then in acetone (see 5.1) and dry using warm air.BS EN ISO 9455‑5 pdf download.