Chemical properties: A soft metal (face-centered cubic) with a blue-grey color and metallic luster. Melting point: 327.5â??. Boiling point: 1740â??. Relative density: d1811.3437. Soluble in nitric acid and hot concentrated sulfuric acid, insoluble in water. Uses: Used in compound semiconductors, refrigeration elements, infrared photoelectric conversion devices, high-efficiency temperature difference elements, and solders, etc. Uses: Used as analytical reagents and reducing agents Uses: Used as high-purity analytical reagents and reducing agents Uses: Used in the manufacture of cable sheaths, storage batteries, lead alloys, pigments, ammunition, sulfuric acid production equipment, and can also be used as X-ray protection screens, nuclear reactor equipment, etc. Uses: Used in storage batteries, cables, solders, etc. Uses: Used in cables, storage batteries, babbitt alloys, type alloys, and materials for X-ray protection, etc. Uses: Reducing agent for determining tin; reducing high iron to ferrous iron; used for the separation of iridium from platinum and rubidium; alloy manufacturing Uses: Mainly used in cables, storage batteries, lead smelting, scrap copper smelting, printing, solder, etc.