1-Hydroxyethylidene-1,1-diphosphonic acid (CAS 2809-21-4) — formula C2H8O7P2, molecular weight 205.97 g/mol; category specialty chemicals.
1-Hydroxyethylidene-1,1-diphosphonic acid (CAS 2809-21-4) is a chemical raw material in the specialty chemicals category. Its molecular formula C2H8O7P2 comprises 2 C, 8 H, 7 O, 2 P atoms. Its molecular weight is about 205.97 g/mol. Reported physicochemical data: melting point around 198-199, boiling point around 578.8, LogP about -3.8. As a sourcing and distribution partner we help locate and compare this item across domestic and cross-border channels, arranging samples and batch orders with full COA and compliance files.
| CAS Number | 2809-21-4 |
|---|---|
| Molecular Formula | C2H8O7P2 |
| Molecular Weight | 205.97 g/mol |
| Melting Point | 198-199 |
| Boiling Point | 578.8 |
| LogP | -3.8 |
| Packaging | 25/50kg woven bags, 20/25/50kg fibre drums, 200kg plastic drums, 1000kg IBC (subject to order confirmation) |
| Applications | 典型应用领域：水处理, 工业药剂。规格/纯度：以批次 COA 为准。包装：25/50kg 编织袋, 20/25/50kg 纸板桶, 200kg 塑料桶, 1000kg IBC（以订单确认为准）。储存：阴凉干燥, 密封保存 |
| Category | Water Treatment Chemicals |
Documented applications: 典型应用领域：水处理, 工业药剂。规格/纯度：以批次 COA 为准。包装：25/50kg 编织袋, 20/25/50kg 纸板桶, 200kg 塑料桶, 1000kg IBC（以订单确认为准）。储存：阴凉干燥, 密封保存.
1-Hydroxyethylidene-1,1-diphosphonic acid is a specialty compound with CAS registry number 2809-21-4 and molecular formula C2H8O7P2 (molecular weight 205.97 g/mol), belonging to the specialty chemicals segment of chemical raw materials.
CAS number: 2809-21-4
Its molecular formula C2H8O7P2 comprises 2 C, 8 H, 7 O, 2 P atoms.
Also known as: 1-Hydroxyethylidene-1,1-diphosphonic acid · 羟基乙叉二膦酸
Category: specialty chemicals
The CAS registry number of 1-Hydroxyethylidene-1,1-diphosphonic acid is 2809-21-4.
Molecular formula C2H8O7P2, molecular weight 205.97 g/mol.
It is also registered under: 1-Hydroxyethylidene-1,1-diphosphonic acid, 羟基乙叉二膦酸.
Recorded applications: 典型应用领域：水处理, 工业药剂。规格/纯度：以批次 COA 为准。包装：25/50kg 编织袋, 20/25/50kg 纸板桶, 200kg 塑料桶, 1000kg IBC（以订单确认为准）。储存：阴凉干燥, 密封保存.
Category: Water Treatment Chemicals.
Packaging is agreed per order, from lab-scale packs to bulk, and confirmed with each order rather than fixed on the page. A Certificate of Analysis (COA) ships with every batch and MSDS is available; where the end use carries a regulatory limit (food contact, pharmaceutical or cosmetic), state the standard at enquiry and the grade is set against it.
Independent reference data for 1-Hydroxyethylidene-1,1-diphosphonic acid (CAS 2809-21-4), compiled from public chemistry databases.
| CAS Registry Number | 2809-21-4 |
|---|---|
| PubChem CID | 3305 |
| Molecular formula | C2H8O7P2 |
| Molecular weight | 205.97 g/mol |
| IUPAC name | (1-hydroxy-1-phosphonoethyl)phosphonic acid |
| InChIKey | DBVJJBKOTRCVKF-UHFFFAOYSA-N |
| UNII (FDA) | M2F465ROXU |
| ChEBI ID | CHEBI:4907 |
| ATC code (WHO) | M05BA01 |
| Molecular Weight | 206.03 |
|---|---|
| XLogP3 | -3.7 |
| Hydrogen Bond Donor Count | 5 |
| Hydrogen Bond Acceptor Count | 7 |
| Rotatable Bond Count | 2 |
| Exact Mass | 205.97452659 |
| Monoisotopic Mass | 205.97452659 |
| Topological Polar Surface Area | 135 |
| Heavy Atom Count | 11 |
| Boiling Point | 578.8 |
|---|---|
| Melting Point | 198-199 |
| Melting Point | 105 °C |
| Solubility | 1.15e+01 g/L |
| LogP | -3.8 |
Etidronic acid; 2809-21-4; HEDP; 1-Hydroxyethylidene-1,1-diphosphonic acid; EHDP; Etidronsaeure; Turpinal SL; Acetodiphosphonic acid; Hydroxyethanediphosphonic acid; Acido etidronico; Acide etidronique; Oxyethylidenediphosphonic acid; Dequest 2015; Dequest Z 010; Ferrofos 510; Dequest 2010
| Regulatory & Food Contact | FDA Substance added to food: BOILER WATER ADDITIVE FDA Cumulative Estimated Daily Intake (CEDI): FCS FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS SEQUESTRANT: Food Additives HEDP does not pose a safety concern at the levels of residue that are expected to remain on foods at the time TRS 928-JECFA 63/26 |
|---|---|
| GHS notification summary | 1.6% (35 / 2257) |
| GHS notification summary | 1.6% (35 / 2257) |
|---|---|
| Reported hazard statements | H290 (34.6%), H302 (55.6%), H314 (23.9%), H318 (92.2%), H413 (25.7%), H371 |
This chemical does not meet GHS hazard criteria for 1.6% (35 of 2257) of reports.
H290 (34.6%): May be corrosive to metals [Warning Corrosive to Metals]
1-Hydroxyethylidene-1,1-diphosphonic acid is identified by CAS 2809-21-4, molecular formula C2H8O7P2 and molecular weight 205.97 g/mol. UNII M2F465ROXU; ChEBI 4907; InChIKey DBVJJBKOTRCVKF-UHFFFAOYSA-N. Boiling Point: 578.8; Melting Point: 198-199; Melting Point: 105 °C.
Source: PubChem / Wikidata; the batch COA governs where values differ.
Supplier: Jinan Shenghe Chemical Co., Ltd.
中文页面: 羟基乙叉二膦酸