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, 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. 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.Use only reagents of recognized analytical grade and only distilled, or deionized, water. Place the two freshly cleaned copper mirrors (see 7.2) onto a clean horizontal surface, mirror side up. Place one drop (maximum 0,05 ml) of the flux test solution (see 7.1) on one of the mirrors and, at a distance of approximately 35 mm, one drop (maximum 0,05 ml) of the rosin reference solution (see 5.4). During this operation, the dropper shall not touch the copper mirror. Repeat the procedure with the second copper mirror. Place the two mirrors in a horizontal position in the temperature/humidity oven (see 6.1) and condition the mirrors at 25 °C土2。C and (50土5) % relative humidity for 24 h. Remove the mirrors from the oven and wash off the flux residues using propan-2-ol (see 5.2), or using the solvent used in 7.1. Dry the mirrors using a stream of warm air. Examine the copper mirrors against a white background. The presence of free halide activators in the flux test solution results in partial or complete removal of the copper film at the location of the drop, the copper mirror becoming progressively more transparent as the flux reactivity increases. The presence of amines in the flux can cause misleading results.BS EN ISO 9455-5 pdf download.