1-Hydroxyethylidene-1,1-diphosphonic acid sodium salt

1-Hydroxyethylidene-1,1-diphosphonic acid sodium salt (CAS 29329-71-3) is the sodium salt form of HEDP, a phosphonate chelating agent commercially available under trade names including Cublen K 8514GR and Briquest ADPA 60SH. It carries no assigned E-code and is identified under EC number 249-559-4.

In water treatment, HEDP sodium salt inhibits scale formation and corrosion by binding calcium, magnesium, and iron ions, disrupting crystal growth on metal surfaces. In textile processing, it sequesters hardness ions that would otherwise interfere with dyeing chemistry, and in oilfield applications it controls carbonate and sulfate scale deposition in injection and production systems.

The product is supplied under REACH compliance for the European market. Procurement teams should confirm available grades, concentration levels, and packaging formats directly with the supplier, as specifications vary by application and regional regulatory requirements.