HEDP

Synonym(s)

: Etidronic acid, etidronate, 1-Hydroxyethylidene-1,1-diphosphonic acid

Mol. Formula

: C2H8O7P2

EC / List no.

: 220-552-8

CAS no.

: 2809-21-4

Molecular weight

: 206,03

Etidronic acid is a 1,1-bis(phosphonic acid) ie (ethane-1,1-diyl)bis(phosphonic acid) and has a hydroxy substitution at the 1-position. It inhibits the formation, growth and dissolution of hydroxyapatite crystals by chemisorption onto calcium phosphate surfaces. It has a role as a bone density protective agent, chelator and antineoplastic agent. It is the conjugate acid of an etidronic acid(2-).

Application

»   This substance is used in the following products: water softeners, coating products, washing and cleaning products, air care products, polishes and varnishes, fertilizers and cosmetics, and personal care products.
»   This substance is used in: construction and civil works and agriculture, forestry and fisheries.
»   Release of this substance to the environment may occur from industrial use: in the manufacture of articles.
»   Used in machine wash liquids/detergents, automotive care products, paints, coatings or adhesives, fragrances and air fresheners.

Product Specifications

Physical and Chemical Properties
» HEDP appears as liquid.

Properties

Characteristics	Unit	Value	Condition
Melting point	°C	449.85
Solubility	g/ L	690	20 °C, soluble with water
Density	g/cm³	0.97	20 °C
Vapor pressure	kPa	0	25 °C