Hydroxyethylidene Diphosphonic Acid (HEDP)
| Formula: | C₂H₈O₇P₂ |
| CAS Number: | 2809-21-4 |
| EC Number (EINECS): | 238-288-2 |
| HS Code: | 29313990 |
| UN Number: | Not classified as dangerous goods for transport |
| IUPAC Name: | 1-Hydroxyethylidene-1,1-diphosphonic Acid |
| Also Known As: | Etidronic Acid; HEDP; 1-Hydroxyethane-1,1-diphosphonic Acid |
| Molecular Weight, g/mol: | 206.03 |
Typical Specifications
| Appearance: | Clear, colorless to pale yellow aqueous solution |
| Odor: | Odorless |
| Melting Point, °C: | ~198 (solid grade, decomposes) |
| Solubility: | Miscible with water, insoluble in organic solvents |
| Grades Available: | 60% aqueous solution, 90% solid |
| Packaging: | 250kg drums, 1000kg IBC tanks, 25kg bags (solid) |
Applications / Uses
Primary Applications
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Scale and corrosion inhibitor in cooling water treatment, boilers, and oilfields
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Chelating agent in detergents and cleaning agents
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Stabilizer for hydrogen peroxide solutions
Secondary Applications
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Used in textile dyeing and bleaching processes
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Additive in cosmetics and personal care formulations
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Ingredient in industrial cleaners and household detergents
End Industries Served: Water Treatment, Oil & Gas, Detergents, Cleaning, Textiles, Cosmetics, Pulp & Paper
Safety & Handling Information
Hazard Class (GHS): Corrosive to metals (Category 1), Skin/Eye Irritant (Category 2)
Hazard Statements (H-Codes):
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H290: May be corrosive to metals
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H315: Causes skin irritation
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H319: Causes serious eye irritation
Precautionary Statements (P-Codes):
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P280: Wear protective gloves/eye protection
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P264: Wash hands thoroughly after handling
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P305 + P351 + P338: IF IN EYES – rinse cautiously with water for several minutes, remove contact lenses if present
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P337 + P313: If eye irritation persists, get medical advice/attention
Storage Conditions
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Store in cool, dry, ventilated place
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Keep containers tightly closed
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Avoid contact with strong oxidizing agents
Transport Information
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ADR/RID: Not classified as dangerous goods
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IMDG: Not classified as dangerous goods
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IATA: Not classified as dangerous goods