Methyl methanesulfonate
Also known as: Methanesulfonic acid methyl ester, Methyl mesylate, MMS, Methanesulfonic acid, methyl ester, Methyl methansulfonate, Methyl methansulphonate, Methylmethanesulfonate, Methylsulfonic acid methyl ester, Methyl methane sulfonate, methanesulphonic acid methyl ester, CB 1540, EINECS 200-625-0, MFCD00007557, UNII-AT5C31J09G, as-Dimethyl sulfite, as-Dimethyl sulphite, as-dimethylsulfite, as-dimethylsulphite
Methyl methanesulfonate (CAS 66-27-3) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C2H6O3S and a molecular weight of 110.13 g/mol. Key properties include a melting point of 20ºC, a boiling point of 202.1±9.0 °C at 760 mmHg, a density of 1.2±0.1 g/cm3 and a flash point of 104.4±0.0 °C. It is classified under GHS with signal word Danger and hazard statements H301 — Toxic if swallowed, H315 — Causes skin irritation and H319 — Causes serious eye irritation. It is listed by 1 supplier, from 34.42 to 34.42 CNY per 25g. Record last updated Aug 21, 2026.
- CAS No.
- 66-27-3
- Jingsj CID
- J-9137-0
- Molecular Formula
- C2H6O3S
- Molecular Weight
- 110.13 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
| Supplier | Purity / Pack | Base Price | Unit Price | Origin | |
|---|---|---|---|---|---|
In Stock | >98.0%(GC) 25g | ¥860.40 | $5.15 /gBest ¥34.42/g CNY | CN China MOQ 25g |
Physicochemical Properties
| Melting Point | 20ºC |
|---|---|
| Boiling Point | 202.1±9.0 °C at 760 mmHg |
| Density | 1.2±0.1 g/cm3 |
| Flash Point | 104.4±0.0 °C |
| Exact Mass | 110.003761 |
| PSA | 51.75000 |
| LogP | -0.57 |
| Vapor Pressure | 0.4±0.4 mmHg at 25°C |
| Refractive Index | 1.406 |
| Stability | Stable. Combustible. Incompatible with strong oxidizing agents, strong acids, strong bases. |
| Additional Property | 200 g/L (20 ºC) |
GHS Safety & Compliance
- H301 — Toxic if swallowed
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
- H350 — May cause cancer
Frequently Asked Questions
What is the CAS number of Methyl methanesulfonate?
The CAS number of Methyl methanesulfonate is 66-27-3.
What are the molecular formula and molecular weight of Methyl methanesulfonate?
Methyl methanesulfonate has molecular formula C2H6O3S and molecular weight 110.13 g/mol.
Which suppliers offer Methyl methanesulfonate?
1 supplier(s) listed; reference unit price ¥34.42–34.42 /g.
Is Methyl methanesulfonate hazardous?
Methyl methanesulfonate has GHS signal word Danger and hazard statements H301 — Toxic if swallowed; H315 — Causes skin irritation; H319 — Causes serious eye irritation.
What are the upstream and downstream products of Methyl methanesulfonate?
For Methyl methanesulfonate, Upstream Products: Methanol, Methanesulfonic acid, Dimethyl sulfite; Downstream Products: Methanol, Chloromethane, Dimethyl ether.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Methyl methanesulfonate (CAS 66-27-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-9137-0 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.