BS EN ISO 9455-3:1995 Soft soldering fluxes. Test methods - Part 3. Determination of acid value, potentiometric and visual titration methods
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This part of ISO 9455 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.