Special quality for biochemical purposeNH2CO.NH2 M.W. 60.06Assay min 99.5%Melting point 132-1330CInsoluble matter max 0.003%Acidity max 0.05 ml N%Alkalinity max 0.05 ml N%Sulphated ash max 0.005%Chloride(Cl) max 0.0005%Sulphate(SO4) max 0.001%Copper(Cu) max 0.0001%Iron(Fe) max 0.0001%Lead(Pb) max 0.0002%Biuret(C2H5N3O2) max 0.05%