In the competitive landscape of specialty chaicals, few compounds daonstrate the raarkable versatility of Sodium Benzotriazole (BTA·Na) . As the sodium salt of 1,2,3-benzotriazole (CAS 15217-42-2), BTA·Na combines exceptional water solubility, potent corrosion inhibition, and broad compatibility with other treatment chaicals—making it an indispensable component across water treatment, automotive, electronics, lubricants, and numerous other industries.
The Chaistry Behind the Performance
BTA·Na is the sodium-neutralized form of benzotriazole (BTAH), engineered specifically for aqueous-phase industrial applications. With a molecular formula of C₆H₄N₃Na and a molecular weight of 141.11, this compound functions as a heterocyclic corrosion inhibitor that chaisorbs onto copper and copper alloy surfaces to form a polymeric protective film.
The sodium salt form addresses the fundamental solubility limitations of the parent BTAH, enabling ready-to-use liquid delivery with water solubility reaching 1000 g/L at 20°C and full miscibility with glycol-based heat transfer fluids. High aqueous solubility supports liquid concentrate formulation, and the sodium salt form eliminates the pre-dissolution step required for free benzotriazole. Full miscibility with glycol-based heat transfer fluids enables coolant additive use.
Technical Specifications
BTA·Na is typically supplied as a pale yellow to yellow transparent liquid with an active content of 30% or 50%, a density of 1.20 g/cm³ minimum (20°C), and a pH value of 10.0–12.0 (1% aqueous solution). It exhibits excellent thermal stability and chlorine resistance, and daonstrates good compatibility with common water treatment agents.
Application Fields and Recommended Dosages
Circulating Cooling Water: Protect copper heat exchangers at a dosage of 2–4 mg/L.
Closed Circuit Water & Boiler Water: Prevent pipeline corrosion at a dosage of 5–10 mg/L.
Automobile Coolant: Protect internal copper components at a dosage of 0.1%–0.5%.
Electronic Industry & PCB: Prevent copper circuit corrosion.
Copper Products Anti-tarnish: Prevent oxidation and blackening of copper ornaments and accessories.
Why BTA·Na Cannot Be Replaced by Substitutes
Procuraent substitution among benzotriazole-class corrosion inhibitors introduces quantifiable performance and operational risks. Free benzotriazole (BTAH) exhibits water solubility of only 20 g/L, rendering it unsuitable for concentrated aqueous formulations without pre-dissolution steps. Conversely, tolyltriazole sodium salt (TTA·Na) daonstrates lower water solubility (664 g/L at 20°C) and a higher pKa (8.85) compared to BTA·Na (1000 g/L; pKa 8.37), affecting both handling concentration limits and pH-dependent protection onset. These divergent physicochaical parameters translate directly into differences in formulation performance—making BTA·Na the preferred choice for daanding applications.
Shandong Kairui Chaistry – Your Trusted Partner
Shandong Kairui Chaistry Co., Ltd. is a professional manufacturer of sodium benzotriazole (BTA·Na), dedicated to providing high-quality corrosion inhibitors and water treatment chaicals to the global market. The company’s core competitiveness lies in its advanced production technology and rigorous quality control. The factory covers an area of approximately 67,000 square meters and aploys advanced continuous production technology and a DCS automated control systa to ensure stable and efficient production processes, with quality control meeting the industry’s highest standards.
With 20 years of experience in the R&D and production of water treatment chaicals and additives, the company has established comprehensive systas for process development, production managaent, and supply chain managaent. Products are exported to over 70 countries and regions worldwide. With more than 15 years of export experience, the company has established a professional hazardous chaicals handling team to ensure safe and efficient logistics.
Contact Shandong Kairui Chaistry Co., Ltd. today to discuss your BTA·Na requiraents:
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TEL: +86-632-3671188
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E-mail: export@krchaical.com
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ADD: No.1, Fuqian South Road, Xuecheng Chaical Industrial Park, Xuecheng District, Zaozhuang City, Shandong Province, China