ISO 9455-9:1993 Preview
Soft soldering fluxes -- Test methods -- Part 9: Determination of ammonia content
This standard was last reviewed and confirmed in 2014. Therefore this version remains current.
The principle of the method specified is to distil a prepared flux solution with sodium hydroxide to expel the ammonia present in the flux, to pass the resulting distillate into a standard sulfuric acid solution, to titrate the excess acid with sodium hydroxide solution and to calculate the ammonia content of the flux. Applies to fluxes of class 3.1.1 only, as defined in ISO 9454-1.