Methylphosphonic acid
Also known as: Methanephosphonic acid, Phosphonic acid, methyl-, Dihydrogen methylphosphonate, MPA, NSC 119358
Methylphosphonic acid (CAS 993-13-5) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula CH5O3P and a molecular weight of 96.022 g/mol. Key properties include a melting point of 103-105ºC, a boiling point of 265.2±23.0 °C at 760 mmHg, a density of 1.5±0.1 g/cm3 and a flash point of 114.2±22.6 °C. It is classified under GHS with signal word Danger and hazard statements H302 — Harmful if swallowed and H314 — Causes severe skin burns and eye damage. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 993-13-5
- Jingsj CID
- J-13881-8
- Molecular Formula
- CH5O3P
- Molecular Weight
- 96.022 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 103-105ºC |
|---|---|
| Boiling Point | 265.2±23.0 °C at 760 mmHg |
| Density | 1.5±0.1 g/cm3 |
| Flash Point | 114.2±22.6 °C |
| Exact Mass | 95.997627 |
| PSA | 67.34000 |
| LogP | -2.02 |
| Vapor Pressure | 0.0±1.1 mmHg at 25°C |
| Refractive Index | 1.431 |
| Additional Property | H2O: soluble2.88 g in 30 mL, clear, colorless |
GHS Safety & Compliance
- H302 — Harmful if swallowed
- H314 — Causes severe skin burns and eye damage
Customs & Trade Information
| HS Code | 2931900090 |
|---|---|
| Summary | 2931900090. other organo-inorganic compounds. VAT:17.0%. Tax rebate rate:13.0%. Supervision conditions:AB(certificate of inspection for goods inward,certificate of inspection for goods outward). MFN tariff:6.5%. General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of Methylphosphonic acid?
The CAS number of Methylphosphonic acid is 993-13-5.
What are the molecular formula and molecular weight of Methylphosphonic acid?
Methylphosphonic acid has molecular formula CH5O3P and molecular weight 96.022 g/mol.
Is Methylphosphonic acid hazardous?
Methylphosphonic acid has GHS signal word Danger and hazard statements H302 — Harmful if swallowed; H314 — Causes severe skin burns and eye damage.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Methylphosphonic acid (CAS 993-13-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-13881-8 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.