Assay (Iodom.)...................................................................................99 %
pH of 5% solution.......................................................................... 3,7-4,0
Insoluble matter in H2O................................................................... 0,01 %
Chloride (Cl).................................................................................... 0,01 %
Sulphate (SO4)................................................................................ 0,05 %
Ca................................................................................................... 0,01 %
Fe.................................................................................................. 0,005 %