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ISO 9455-3:2019 Soft soldering fluxes - Test methods - Part 3: Determination of acid value, potentiometric and visual titration methods
standard by International Organization for Standardization, 10/01/2019
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ISO 9455-3:2019 specifies two methods for the determination of the acid value of a flux of types 1 and 2 only, as defined in ISO 9454-1.
Method A is a potentiometric titration method and is to be considered as the reference method.
Method B is an alternative, visual end-point, titration method.