TiO2 M.W. 79.90  Assay min 99.0%  Substances soluble in water max 0.5% Subs.soluble in dil. HCl max 0.5% Sulphate(SO4) max 0.05% Heavy metals(as Pb) max 0.003% Iron(Fe) max 0.02% Arsenic(As) max 0.0005% Loss on ignition at 800oC max 0.5%