Heavy water
Also known as: (H)Water, D2O, D2O (water-d2), DEUTERATED WATER, DEUTERIUM OXIDE, DEUTERIUM OXIDE, "100" (MIN. 99.96 ATOM% D), Deuterium oxide Ultra-D, Deuterium oxide, Heavy water, Water-d2, Deuterium oxide, Deuterium oxide "100%" >99.98 Atom % D, Deuterium oxide >99.92 Atom % D, Dideuterium oxide, EINECS 232-148-9, Heavy water, Water-d2, Heavy water (D2O), Heavy water-d2, MFCD00044636, WATER, HEAVY, WATER-D2, Water(sup 2)-H2
Heavy water (CAS 7789-20-0) is a compound in the Inorganic Chemicals category listed in the Jingsj chemical database. It has the molecular formula D2O and a molecular weight of 20.028 g/mol. Key properties include a melting point of 3.8 °C(lit.), a boiling point of 100.0±9.0 °C at 760 mmHg, a density of 1.0±0.1 g/cm3 and a flash point of 101.4°C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 7789-20-0
- Jingsj CID
- J-6503-4
- Molecular Formula
- D2O
- Molecular Weight
- 20.028 g/mol
- Category
- Inorganic Chemicals
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 3.8 °C(lit.) |
|---|---|
| Boiling Point | 100.0±9.0 °C at 760 mmHg |
| Density | 1.0±0.1 g/cm3 |
| Flash Point | 101.4°C |
| Exact Mass | 20.023117 |
| PSA | 9.23000 |
| LogP | -1.38 |
| Vapor Pressure | 24.5±0.3 mmHg at 25°C |
| Refractive Index | 1.329 |
Frequently Asked Questions
What is the CAS number of Heavy water?
The CAS number of Heavy water is 7789-20-0.
What are the molecular formula and molecular weight of Heavy water?
Heavy water has molecular formula D2O and molecular weight 20.028 g/mol.
What are the upstream and downstream products of Heavy water?
For Heavy water, Upstream Products: Water, Formic acid-d2, Carbon dioxide; Downstream Products: Water, deuterium iodide, Sodium formate-d.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Heavy water (CAS 7789-20-0)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-6503-4 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.