Soft soldering fluxes - Test methods - Part 3: Determination of acid value, potentiometric and visual titration methods (ISO 9455-3:1992); German version EN ISO 9455-3:1994— 6 стр.
Soft soldering fluxes - Classification and requirements - Part 2: Performance requirements (ISO 9454-2:1998); German version EN ISO 9454-2:2000— 12 стр.