2021DIN EN ISO 9455-9:2021 Soft soldering fluxes - Test methods - Part 9: Determination of ammonia content (ISO 9455-9:2020); German version EN ISO 9455-9:2020
1970DIN EN ISO 9455-9 E:2020-09 Test methods for soldering flux Part 9: Determination of ammonia content (draft)
1995DIN EN ISO 9455-9:1995 Soft soldering fluxes - Test methods - Part 9: Determination of ammonia content (ISO 9455-9:1993); German version EN ISO 9455-9:1995