22 years, we have been specializing in the production of high purity metals (4N,5N,6N,7N) and compounds : Tellurium(Te),Cadmium(Cd),Sulfur(S),Antimony(Sb),Bismuth(Bi),Indium(In),Plumbum(Pb) Selenium(Se), Stannum(Sn) ,Zinc(Zn) . High Purity Compound: Bismuth Selenide Bi2Se3; Bismuth Tritelluride Bi2Te3; Dibismuth Trioxide Bi2O3 ; Bismuth Trisulfide Bi2S3; Cadmium Selenide CdSe ; Cadmium Sulfide CdS ; Cadmium Telluride CdTe; Gallium Arsenide GaAs; Gallium Trisulfide Ga2S3 ; Indium Selenide In2Se3 ; Indium Telluride InTe; Zinc Oxide ZnO ; Tellurium Dioxide TeO2; Zinc Telluride ZnTe;