Etidronate disodium

Etidronate disodium (CAS 7414-83-7) is a bisphosphonate chelating agent commercially known under trade names including Didronel, Calcimux, Etidron, and SM-5600. It carries no assigned E-code and is classified under HS code 29319090. The compound sequesters metal ions through stable coordination bonds with calcium, iron, and other polyvalent cations.

In water treatment, etidronate disodium inhibits scale formation by binding calcium ions before they precipitate as carbonate or phosphate deposits. In personal care formulations, it stabilizes emulsions and extends preservation efficacy by deactivating trace metals that would otherwise catalyze oxidative degradation or support microbial growth.

Etidronate disodium is supplied as a white crystalline solid and is available in pharmaceutical-grade (Ph.Eur.-compliant) and technical-grade specifications to meet the requirements of different industries. The substance is registered under REACH and procurement quantities are typically offered in 25 kg bags or bulk formats depending on application grade.