DIN EN ISO 9455-3:1994
软钎焊剂.试验方法.第3部分:酸值测定、电势测定法和目测滴定法 (ISO 9455-3:1992); 德文版本 EN ISO 9455-3:1994
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