CAS No. 2809-21-4

Molecular Formula: C2H8O7P2

1.Appearance	White crystal powder
Active component (as HEDP)	≥ 90%
Phosphorous acid(as PO33- )	≤ 0.80%
Phosphoric acid (as PO43- )	≤ 0.50%
Chloride(as Cl-)	≤ 0.10%
PH(1% water solution)	≤ 2.0%
Active component (as HEDP H2O)	≥ 98.0%
2.Appearance	Colorless or pale yellow transparent liquid
Active content	≥ 60.0%
Phosphorous acid (as PO33- )	≤ 2.0%
PH(1% water solution)	≤ 2.0
Density@20℃	≥ 1.40 g/cm3
Phosphoric acid (as PO43- )	≤ 0.8 %
Chloride (as Cl-)	≤ 1.0

Product Name: 1-Hydroxyethylidene-1,1-diphosphonic acid
Synonyms: (1-hydroxyethylene)diphosphonicacid;
(1-hydroxyethylidene)di-phosphonicaci;
(hydroxyethylidene)diphosphonicacid;
1,1,1-ethanetrioldiphosphonate;
1-hydroxy-1,1-diphosphonoethane;
1-Hydroxyethanediphosphonica

1-Hydroxyethylidene-1,1-diphosphonic acid Chemical Properties
mp 198~199℃
density 1.45 (60% aq.)
Merck 14,3863
Safety Information
Hazard Codes Xi
Risk Statements 37/38-41
Safety Statements 26-39

Chemical Properties light beige powder

Molecular Formula: C2H8O7P2
Molecular Weight: 206.03
Hazard Symbols: Xi,Xn
UN Number: UN 3265
WGKGermany: 2
PackingGroup: II
HS Code: 29319090

More details are to be found on supplier website

Active content (as acid)%	58.0-62.0
Phosphorous acid(as PO33-) %	≤ 2.5
Phosphoric acid(as PO43-)%	≤ 0.7
Chloride (as Cl-) %	≤ 0.50
pH(1% solution)	≤ 2.0
Density(20°C) g/cm3	1.39 – 1.49
Calcium sequestration mg/g	≥ 500
Appearance	colorless to pale yellow transparent liquid

EINECS:220-552-8
Molecular formula:C2H8O7P2

Melting point: 198~199℃ | Boiling point: 578.8±60.0 °C | Density: 1.45 (60% aq.) | Vapor pressure: 0Pa at 25℃ | LogP: -3.5 | Acidity coefficient (pKa): 1.35, 2.87, 7.03, 11.3(at 25℃)

Assay : 99%

EC No: 220-552-8
Industry: Water Treatment, Household & Industrial Care, Agriculture

Synonyms:
1-Hydroxyethane-1,1-diphosphonic acid; 1-Hydroxyethylidene-1,1-diphosphonic acid; 1-hydroxyethylidenedi(phosphonic acid); Etidronic Acid; 1-Hydroxyethylidene-1,1-bis-(phosphonic acid); Ethane-1-hydroxy-1,1-diphosphonic acid; 1-Hydroxy-1,1-diphosphonoethane; Oxyethylidenediphosphonic acid