StructureHydroxyphosphono-acetic acid (HPAA)
CAS No. 23783-26-8
EC No. 405-710-8
Synonyms 2-Hydroxy-2-phosphono-acetic acid; 2-hydroxy-2-phosphonoacetic acid; 2-hydroxy-2-phosphono-ethanoic acid; Acetic acid, hydroxyphosphono-; alpha.-Hydroxyl phosphonoacetic acid; alpha.-Hydroxyphosphonoacetic acid

Hydroxyphosphono-acetic acid (HPAA)

Hydroxyphosphono-Acetic Acid (HPAA) will be delivered as a 50% aqueous solution.

The product is considered being a mild steel corrosion inhibitor and is mainly used in the water treatment industry. It shows superior performance in all organic formulations compared to commonly used Phosphonates. In certain formulations it can replace Molybdate or its derivatives.


  • cooling water systems / industrial water treatment
  • metal surface treatment as corrosion inhibitor for steel

Shelf Life

Under proper storage conditions, the shelf life is 12 months

​Health & Safety

Detailed information on the product described can be found in our relevant Health and Safety Information (Material Safety Data Sheet)