... silvery lustrous grayMelting point 449.51°CSpecificationsa.High purity Tellurium(Te 99.99%)Impurities(%) Cu 0.0035 Pb 0. ... 0018 As 0.0005 Mg 0.0005 b.High purity Tellurium(Te 99.999%)The total content of Ag ,Al, ... Pb,Se and Sn is below 10ppm;c.Ultra purity Tellurium(Te 99.9999%)The total content of Ag ,Al, ... Se and Sn is below 1ppm;d.Ultra High purity Tellurium(Te 99.99999%)The total content of Ag ,Al,Cd ...