... Grade 99.999. The content of Sulfur is above 99.999%. The total content of Al, As, Co, Cu, Fe, Mn,Ni, Pb ... -06 Grade 99.9999. The content of Sulfur is above 99.9999%. The total content of Al, Co, Cu, Fe, Mn,Ni, Pb ... , Powder.4, Usage:It is mainly used in the manufacture of II-VI compound semiconductors, photoelectric devices and glass semiconductor elements ...