Overview
Litharge, or lead(II) oxide (PbO), is a widely used inorganic compound in industrial applications. It exists in two crystalline forms: the tetragonal litharge (red) and the orthorhombic massicot (yellow). Litharge is primarily produced by oxidizing molten lead in air and is valued for its chemical stability and reactivity with other materials. Historically, litharge has been used since ancient times in glazes, pigments, and metallurgy. Today, it remains essential in manufacturing processes such as lead glass production, where it improves refractive properties, and in rubber vulcanization to enhance durability.
Physical and Chemical Properties
Litharge appears as a yellow or reddish-yellow crystalline powder with a high density of 9.53 g/cm³. It melts at 888°C and boils at 1470°C, making it suitable for high-temperature applications. The compound is insoluble in water but reacts with acids to form lead salts and with alkalis to produce plumbites. Its electrical conductivity is low, but it exhibits semiconducting properties under certain conditions. Litharge’s reactivity with sulfur compounds makes it useful in rubber vulcanization, while its optical properties are leveraged in lead glass manufacturing.
Main Applications
Litharge’s primary use is in the production of lead glass (crystal glass), where it enhances clarity and refractive index. It is also a key component in ceramics, providing glossy finishes and improving glaze adhesion. In the paint industry, litharge serves as a pigment and drying agent for lead-based paints, though its use has declined due to toxicity concerns. Other applications include rubber vulcanization, where it acts as an accelerator, and in metallurgy for refining gold and silver. It is also used in batteries, radiation shielding, and as a precursor for other lead compounds like red lead (Pb3O4).
Safety and Storage
Litharge is highly toxic if ingested or inhaled, posing risks of lead poisoning. Chronic exposure can damage the nervous system, kidneys, and reproductive organs. Proper personal protective equipment (PPE), including gloves, goggles, and respirators, is mandatory when handling this compound. Storage requires a cool, dry, and well-ventilated area, away from acids and reducing agents to prevent hazardous reactions. Containers must be airtight and labeled clearly with hazard warnings. Spills should be cleaned up immediately using appropriate methods to avoid environmental contamination.
B2B Procurement Guide
When procuring litharge, prioritize suppliers who provide certificates of analysis (CoA) to verify purity (typically ≥99%). Ensure compliance with local and international regulations, such as REACH and OSHA standards, due to its toxicity. Bulk purchases (tonnage quantities) often reduce costs, with prices ranging approximately $2.5-$4 per kg. Evaluate suppliers for reliable logistics, especially if importing, as lead compounds may face strict customs scrutiny. Request safety data sheets (SDS) and confirm packaging standards to prevent leakage or contamination during transit.
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