Overview
Anhydrous borax, or sodium tetraborate, is a versatile boron compound with significant industrial applications. It is derived from borax by removing water molecules, resulting in a more concentrated form. This compound is essential in various industries due to its unique chemical properties, including high thermal stability and alkaline nature. Anhydrous borax is primarily produced through the dehydration of borax decahydrate. The process involves heating borax to remove water, yielding a product with superior performance in high-temperature applications. Its widespread use spans from glass and ceramics to detergents and metallurgical processes.
Physical and Chemical Properties
Anhydrous borax is a white crystalline powder with a density of 2.367 g/cm³. It has a high melting point of 741°C and a boiling point of 1,575°C, making it suitable for high-temperature applications. The compound is soluble in water and slightly soluble in alcohol, with its solubility increasing with temperature. Chemically, anhydrous borax is stable under normal conditions but reacts with strong acids to form boric acid. Its alkaline nature makes it useful as a buffering agent and flux in metallurgy. The compound’s low toxicity and environmental impact further enhance its industrial appeal.
Main Applications
Anhydrous borax is a critical component in the manufacturing of borosilicate glass, which is known for its thermal shock resistance. It is also used in ceramics to improve glaze durability and reduce firing temperatures. In the detergent industry, it acts as a water softener and stain remover. Metallurgical applications include its use as a flux to remove oxides from metal surfaces during welding and soldering. Additionally, anhydrous borax is employed in fire retardants, wood preservatives, and as a micronutrient in agriculture. Its versatility makes it indispensable across multiple sectors.
Safety and Storage
While anhydrous borax is relatively low in toxicity, proper handling is essential to prevent health risks. Inhalation of dust can irritate the respiratory tract, and prolonged skin contact may cause irritation. Use protective equipment such as gloves and masks when handling the compound. Storage should be in a cool, dry place away from moisture to prevent caking. Containers must be tightly sealed to avoid absorption of atmospheric moisture. Spills should be cleaned up promptly to prevent slipping hazards and environmental contamination.
B2B Procurement Guide
When procuring anhydrous borax, verify the supplier’s credibility and request a Certificate of Analysis (COA) to ensure product purity and quality. Bulk purchases often come with cost advantages, but storage capacity and shelf life should be considered. Prices vary based on purity, packaging, and supplier location. For reference, the price ranges between $500 and $700 per ton. Establish long-term contracts with reliable suppliers to secure consistent quality and favorable terms. Always confirm compliance with local and international regulations.
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