cation traces | Bi: ≤0.050 ppm, Cd: ≤0.020 ppm, Zr: ≤0.050 ppm, Zn: ≤0.030 ppm, Tl: ≤0.020 ppm, Ni: ≤0.020 ppm, Pb: ≤0.010 ppm, Li: ≤0.010 ppm, In: ≤0.050 ppm, Ga: ≤0.050 ppm, Au: ≤0.010 ppm, Hg: ≤0.005 ppm, Fe: ≤0.050 ppm, Ag: ≤0.005 ppm, Ba: ≤0.010 ppm, Sr: ≤0.010 ppm, heavy metals (as Pb): ≤0.5 ppm, Mo: ≤0.010 ppm, Sn: ≤0.050 ppm, Co: ≤0.010 ppm, Cr: ≤0.020 ppm, Ca: ≤0.100 ppm, Ge: ≤0.020 ppm, K: ≤0.100 ppm, As: ≤0.010 ppm, Cu: ≤0.010 ppm, Mn: ≤0.010 ppm, Pt: ≤0.100 ppm, Ti: ≤0.050 ppm, Mg: ≤0.050 ppm, V: ≤0.010 ppm, Al: ≤0.020 ppm, Na: ≤0.200 ppm, B: ≤0.100 ppm, Be: ≤0.005 ppm |