The method consists in pre-drying of a test portion on a boiling water-bath and subsequent evaporation of the remaining water in the presence of sand at a temperature of 102+2 鳦 in a drying oven.
ISO 6734:1989 history
2010ISO 6734:2010 Sweetened condensed milk - Determination of total solids content (Reference method)
1989ISO 6734:1989 Sweetened Condensed Milk - Determination of Total Solids Content (Reference Method) First Edition