... Selenium:Se-05 Grade 99.999. The content of Selenium is above 99.999%. The total content ... Selenium:Se-06 Grade 99.9999. The content of Selenium is above 99.9999%. The total content ... of Ag, Al, Mg, Au, Bi, Cd, Co, In, Cu ... drum, photoelectric material, electrostatic photogragh and other materials of optical instrument..5, Packing:It is packed with dacron film, ...