Assay (Iodom.)...................................................................................99 %
pH of 5% solution.......................................................................... 5,0-9,0
Insoluble matter in H2O................................................................... 0,01 %
Nitrogen compounds (as N)......................................................... 0,005 %
Sulphate (SO4).............................................................................. 0,025 %
Cu................................................................................................. 0,002 %
Fe.................................................................................................. 0,002 %
Ni.................................................................................................. 0,002 %
Pb................................................................................................. 0,002 %