This International Standard specifies a reference method for the determination of the "fixed ash" of caseins, as a percentage by mass, obtained by acid precipitation or lactic fermentation, of ammonium caseinates, of their mixtures with rennet casein and with caseinates, and of caseins of unknown type.
NOTE For the determination of ash of rennet caseins and caseinates (except ammonium caseinates), see ISO 5545/IDF 90.