2-Hydroxyethyliminodimethanephosphonic acid

2-Hydroxyethyliminodimethanephosphonic acid (CAS 5995-42-6), commonly referred to as HEIDP, is a phosphonate chelating agent used to control scale formation and metal ion interference in industrial water systems.

Where is 2-Hydroxyethyliminodimethanephosphonic acid used?

• Industrial water treatment: scale and corrosion inhibitor blends for cooling water circuits, boilers, and reverse osmosis systems
• Home care and institutional cleaning: sequesters hardness ions, improving surfactant performance and preventing redeposition
• Textile processing: controls metal ion interference during dyeing and bleaching, protecting color consistency and fabric quality
• Paper and leather manufacturing: process water treatment that prevents mineral scaling on equipment and improves process efficiency
• It binds calcium, magnesium, and heavy metal ions, preventing precipitation and deposit buildup in process equipment.

Good to know: Buyers specifying phosphonate content should request lot-specific assay data to confirm active acid concentration for formulation accuracy. Proper handling and storage are required to maintain stability and effectiveness over time.

Commercial specifications

• Aqueous solution, typically 30–50% concentration
• Lot-specific assay data available on request