Tetrasodium etidronate

Tetrasodium etidronate (CAS 3794-83-0), also marketed as Turpinal 4NL and Sequion 10Na4 and abbreviated HEDP·4Na, is the fully neutralized tetrasodium salt of 1-hydroxyethylidene-1,1-diphosphonic acid.

Where is Tetrasodium etidronate used?

• Personal care: stabilizes hydrogen peroxide in hair bleaching and coloring products, extending shelf life and preventing premature decomposition
• Water treatment: inhibits scale deposition and corrosion in cooling towers, boilers, and process water circuits
• Textile and paper processing: sequesters hardness ions during bleaching and dyeing, preventing metal-catalyzed fiber damage
• Oil and gas production: controls mineral scale in pipelines and injection systems where calcium carbonate and phosphate deposits restrict flow
• It binds calcium, magnesium, and heavy metal ions to prevent scale formation, oxidative degradation, and corrosion.

Commercial specifications

• 35–40% active content
• Packaging: drums to IBC containers