Structure1-Hydroxyethylidene-1,1-diphosphonic acid tetrasodium salt (HEDP 4Na)
CAS No. 3794-83-0
EC No. 223-267-7
Synonyms (1-Hydroxyethylidene)bis-phosphonic acid tetrasodium salt; 1-Hydroxyethylidene diphosphonic acid tetrasodium salt; tetrasodium (1-hydroxyethylidene) bisphosphonate; 1-Hydroxyethylidene-1,1-bis-(phosphonic acid) tetrasodium salt; Etidronate tetrasodium; Etidronic acid tetrasodium salt; 1-Hydroxyethane-1,1-diphosphonic acid tetrasodium salt

1-Hydroxyethylidene-1,1-diphosphonic acid tetrasodium salt (HEDP 4Na)

1-Hydroxyethylidene-1,1-diphosphonic acid tetrasodium salt (HEDP 4Na) is a cost effective scale inhibitor used in various industrial applications such as industrial water treatment and detergents. It further shows good stability in presence of chlorine as well as corrosion inhibition properties in presence of zinc and other phosphates.


  • Cooling water systems / industrial water treatment
  • Industrial detergents
  • Swimming pools
  • 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)