This part of ISO 9455 specifies an ebulliometric method for the determination of the content of nonvolatile matter in soft soldering fluxes. It is applicable to liquid fluxes of classes 1.1.1, 1.1.2 and 1.1.3, as defined in ISO 9454-1, and only those fluxes containing solvents of relatively high volatility, such as propan-2-ol. The method is applicable only to fluxes with a non-volatile content of 10 % or more. NOTE 1 For the determination of the content of nonvolatile matter of liquid fluxes of these classes, where the solvent has a lower volatility than propan-2-ol, the method given in ISO 9455-1 should be used.