Assay (Redox)....................................................................................99 %
Residue on ignition........................................................................... 0,5 %
Nitrogen compounds (as N)........................................................... 0,01 %
Sulphur compounds (as S)............................................................. 0,05 %
Cu................................................................................................... 0,01 %
Fe.................................................................................................... 0,05 %
Ni.................................................................................................... 0,01 %
Pb................................................................................................... 0,05 %