Overview
Sodium borate is an important boron compound that occurs naturally as the mineral borax. It has been used since ancient times for cleaning and preserving purposes. Today, it serves as a multifunctional chemical in industrial and household applications. The compound exists in both anhydrous and hydrated forms, with the decahydrate (Na₂B₄O₇·10H₂O) being the most common commercial form. It's classified as a sodium salt of tetraboric acid and is produced through mining natural deposits or chemical synthesis from boron-containing ores.
Physical and Chemical Properties
Sodium borate appears as odorless white crystals or powder with an alkaline taste. The decahydrate form effloresces in dry air, losing water molecules. It demonstrates good solubility in water, forming an alkaline solution (pH ~9.2 for 1% solution). Chemically, it acts as a moderate alkali and buffer. When heated, it forms a glass-like substance (boron oxide). The compound shows notable thermal stability and functions as a flame retardant by releasing water of crystallization when heated. These properties make it valuable in various high-temperature applications.
Main Applications
In detergents and cleaners, sodium borate enhances surfactant performance and acts as a water softener. The cosmetics industry utilizes it as a pH adjuster in creams and lotions. Industrial applications include flux in metallurgy, glaze component in ceramics, and wood preservative. The compound also serves agricultural purposes as a micronutrient fertilizer and insecticide. In laboratories, it's used for buffer solutions. Emerging applications include use in flame-retardant materials and as a cross-linking agent in polymer chemistry. The pharmaceutical industry employs it in some antiseptic formulations.
Safety and Storage
While sodium borate has low acute toxicity, prolonged exposure can cause irritation to eyes, skin, and respiratory tract. Ingestion of large amounts may lead to nausea, vomiting, and other systemic effects. Proper PPE including gloves and goggles should be used when handling. Storage requires protection from moisture to prevent caking. Bulk quantities should be kept in original containers or moisture-resistant packaging. The decahydrate form should not be stored near heat sources as it may dehydrate. Spills should be cleaned promptly with water and proper containment measures.
B2B Procurement Guide
Industrial buyers should specify the required form (anhydrous or decahydrate) and purity level (typically 99-99.9%). Technical grade is suitable for most industrial applications, while USP/Pharmaceutical grade commands premium pricing. Consider transportation costs as boron compounds are often mined in specific regions (e.g., Turkey, California). Verify supplier certifications for heavy metal content if used in sensitive applications. For international trade, ensure proper Harmonized System (HS) codes are used (2840.11.00 for anhydrous, 2840.19.00 for other borates).
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