... content of Ag, Al, As, Au, Cd, Cr, Cu, Fe, Mg, Ni, Pb, Sn & Zn is bellow 10 ppm;2. Grade 99 ... total content of Ag, Al, As, Au, Cd, Cu, Fe, Mg, Ni, Pb & Zn is bellow 1ppm;3. Grade 99.99999%. The ... total content of Ag, Al, As, Au, Cd, Cu, Fe, Mg, Ni, Pb & Zn is bellow 0.1ppm;3, Physical Size:Lump ...