... in the glass solution with the temperature of 1300 DEG C, and has long service life; it can also ... 0.005, Al 0.0005, Fe 0.005, Cu 0.005,Mg 0.005, Ni 0.0015, Mn 0.005, P 0.005,Ca ... 0.001, Pb 0.0005, C 0.005, ... Bi 0.0005, Sb 0.005,Ti 0. ... ,Bi 0.0005,Sn 0.0005 O 0.005, W 0.15.certification:ISO9001:2008