... ; 3.Low oxgyn; 4.ISO-9000 qualified Lead (Pb)1, Physical character:Atomic Weight: 207.2Density: ρ=11.341g/cm3Melting Point: mp ... , Physical Size:Virgulate, Ingots.4, Usage:It is mainly used in the manufacture of compound semiconductors, refrigerating element, infrared photoelectric converting device, high ...