impurities | ≤0.2 ppm Sulphide (S), ≤0.050 ppm Cd (Cadmium), ≤10 ppm Non volatile matter, ≤0.100 ppm Pt (Platinum), ≤0.050 ppm Mn (Manganese), ≤5 ppm Silicate (as SiO2), ≤0.100 ppm Mg (Magnesium), ≤0.020 ppm In (Indium), ≤0.050 ppm Co (Cobalt), ≤0.100 ppm Au (Gold), ≤10 ppm Carbonate (as CO2), ≤0.100 ppm Fe (Iron), ≤0.500 ppm Ca (Calcium), ≤0.050 ppm Mo (Molybdenum), ≤5 ppm Substances reducing potassium permanganate, ≤0.050 ppm Ba (Barium), ≤0.500 ppm As (Arsenic), ≤0.100 ppm Sn (Tin), ≤0.100 ppm Zn (Zinc), ≤0.100 ppm Bi (Bismuth), ≤0.050 ppm Cr (Chromium), ≤0.100 ppm Cu (Copper), ≤0.020 ppm Li (Lithium), ≤0.050 ppm Ni (Nickel), ≤0.5 ppm Phosphate (PO4), ≤0.020 ppm Ag (Silver), ≤0.5 ppm Heavy metals (as Pb), ≤0.500 ppm Al (Aluminium), ≤0.050 ppm Pb (Lead), ≤0.100 ppm Ti (Titanium), ≤0.500 ppm K (Potassium), ≤2 ppm Pyridine and related substances, ≤2 ppm Nitrate (NO3), ≤0.500 ppm Na (Sodium), ≤0.3 ppm Chloride (Cl), ≤2 ppm Sulphate (SO4), ≤0.050 ppm Tl (Thallium), ≤0.100 ppm Sr (Strontium), ≤0.020 ppm Ga (Gallium) |