PB powder is actually lead powder, lead is a metal chemical element, element symbol Pb, atomic number 82, atomic weight of 207.2, is the largest atomic weight of non-radioactive elements. The metal lead is a face-centered cubic crystal.
Metallic lead is a corrosion-resistant heavy non-ferrous metal materials, lead has a low melting point, high corrosion resistance, X-rays and γ-rays are not easy to penetrate, good plasticity, etc., often processed into sheets and tubes, which are widely used in the chemical industry, cables, storage batteries and radiological protection and other industrial sectors.
Lead is one of the earlier refined metals, as early as in the third millennium BC or so was discovered by mankind and application. The earliest discovery in China was the lead blocks unearthed at the Erlitou site in Yanshi, Henan Province, which existed about 3,500 to 4,000 years ago.