Assay (Arg.).......................................................................................99 %
Insoluble matter in HNO3................................................................ 0,05 %
Non-precipitated by HCl.................................................................. 0,5 %
Alkaline carbonates (as Na2CO3)....................................................... 0,1 %
Sulphate (SO4)................................................................................ 0,01 %
Fe.................................................................................................. 0,001 %
