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Leads (Pb) 1, Physical character: Atomic Weight: 207.2 Density: ρ=11.341g/cm3 Melting Point: mp: 327.5°C Boiling Point: bp: 1751°C 2, Specification: High Purity Leads: Pb-05 Grade 99.999. The content of Leads is above 99.999%. The total content of Ag, Al, As, Bi, Cd, Cu, Fe, Mg, Ni, Sb, Sn & Zn is bellow 10 ppm; Uitra Purity Leads: Pb-06 Grade 99.9999. The content of Leads is above 99.9999%. The total content of Ag, Al, As, Bi, Cd, Cu, Fe, Mg, Ni, Sb, & Sn is bellow 1 ppm; Uitra High Purity Leads: Pb-07 Grade 99.9999. The content of Leads is above 99.99999%. The total content of Ag, Al, As, Bi, Cd, Cu, Fe, Mg, Ni, Sb, Sn & Zn is bellow 0.1 ppm; 3, Physical Size: Virgulate, Ingots. 4, Usage: It is mainly used in the manufacture of compound semiconductors, refrigerating element, infrared photoelectric converting device, high efficient thermoelement and solar etc. 5, Packing: It is packed with dacron film, then covered with a sealed plastic film bag or vacuum sealed in a glass ampule.