This International Standard specifies a method of determining the insolubility index, as a means of assessing the solubility, of dried whole milk, dried partly skimmed milk and dried skimmed milk (defined in FAO/WHO Standard A-5 " as "whole milk powder", "partly skimmed milk powder" and "skimmed milk powder", respectively) whether non-instant or instant.
The method is also applicable to dried whey, dried buttermilk and dried milk-based baby food as well as to any of the dried products listed in which milk fat has been replaced by another fat or which has been roller-dried instead of spray-dried.
IS 12759-1989 history
1990IS 12759-1989 Milk powder and milk powder products—Determination of insolubility index