Items Specification Purity 85%Min 90%Min Colour Index Platinum Cobalt 10max ------ Sulphate as SO4% 0.002 max 0.001 max Chloride as CL% 0.005max 0.003 max Iron as Fe% 0.0005max 0.0004 max Ignition Residue% 0.020max -------- Non-volatiles % --------- 0.020 max