... Al,Cd,Cu,Fe,Mg,Ni,Pb,Se and Sn is below 10ppm;c.Ultra purity Tellurium ... Al,Cd,Cu,Fe,Mg,Ni,Pb,Se and Sn is below 1ppm;d.Ultra High purity ... and Sn is below 0.1ppm.Packing 2.5kg/bagApplication It is primary used in the manufacture of II-vI compound semiconductor ... ,thermoelectric converting element,refrigerating element,piezocrystal and infrared detector ect.