Molekula
Etidronic acid
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Etidronic acid is a synthetic organic phosphonic acid used primarily as a scale and corrosion inhibitor in industrial water treatment and as a bone resorption inhibitor in medical applications. It is available in powder form with a molecular weight of 206.03 g/mol, a CAS number of 2809-21-4, and a molecular formula of CH3C(OH)[PO(OH)2]2. It should be stored at ambient temperatures. Molekula supplies Etidronic acid from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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25 g — £77.40 per pack ex VAT · £92.88 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | White crystalline powder |
| pH | ≤2 |
| Chloride (Cl-) | ≤1.0% |
| Iron (Fe) | ≤35ppm |
| Active content | ≥90.0% |
| Phosphate (PO4)3- | ≤0.7% |
| Phosphite | ≤2.5% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 8 |
| Packing Group | III |
| Acidity | Acid |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Melting Point | 105 °C |
Source: PubChem CID 3305 (PAC Chemical Database)
Identification
| Property | Value |
|---|---|
| SKU | 71356256 |
| CAS Number | 2809-21-4 |
| IUPAC Name | (1-hydroxy-1-phosphonoethyl)phosphonic acid |
| EC Number | 220-552-8 |
| Molecular Formula | CH3C(OH)[PO(OH)2]2 |
| Molecular Weight | 206.03 |
| Exact Mass | 205.9745 |
| SMILES | CC(O)(P(=O)(O)O)P(=O)(O)O |
| InChIKey | DBVJJBKOTRCVKF-UHFFFAOYSA-N |
| InChI | InChI=1S/C2H8O7P2/c1-2(3,10(4,5)6)11(7,8)9/h3H,1H3,(H2,4,5,6)(H2,7,8,9) |
| PubChem CID | 3305 |
| UN Number | UN3265 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 29314900 |
| Tariff Code | 2931493000 |
Safety & GHS
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Corrosive
GHS05
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Serious Health Hazard
GHS08
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Hazardous to the Environment
GHS09
Hazard statements
- H290 May be corrosive to metals
- H303 May be harmful if swallowed
- H318 Causes serious eye damage
- H361d Suspected of damaging fertility. Suspected of damaging the unborn child.
Precautionary statements
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P264 Wash thoroughly after handling
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+312 IF SWALLOWED: Call a POISON CENTER or doctor/physician if you feel unwell
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P308+313 IF exposed or concerned: Get medical advice/attention
- P337+313 If eye irritation persists get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, English (US), French, German, Italian, Portuguese, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- 1-Hydroxyethylidene-1,1-diphosphonic acid
- Acetodiphosphonic acid
- Acide etidronique
- Acido etidronico
- EHDP
- Etidronsaeure
- HEDP
- Hydroxyethanediphosphonic acid
- Oxyethylidenediphosphonic acid
- Turpinal SL
Frequently asked questions
What is etidronic acid used for?
Etidronic acid is primarily used as a chelating agent in industrial water treatment and scale inhibition, and it also has applications in pharmaceuticals and medical imaging.
What is the chemical formula and molecular weight of etidronic acid?
The formula is CH3C(OH)[PO(OH)2]2 and the molecular weight is 206.03 g/mol.
How should etidronic acid be stored?
It should be stored at ambient temperature, away from moisture and incompatible materials.
What grade of etidronic acid does Molekula supply?
Molekula supplies etidronic acid in technical grade; specific grades may vary based on order requirements.
Can Molekula supply etidronic acid in bulk?
Yes, Molekula can supply etidronic acid in bulk quantities—please contact us for pricing and availability.
What documentation comes with an order of etidronic acid?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS), compliant with GHS standards.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.