Methyl methanesulfonate
[CAS 66-27-3]

Identification

• Classification: Organic raw materials >> Inorganic acid ester
• Name: Methyl methanesulfonate
• Synonyms: MMS
• Molecular Formula: C₂H₆O₃S
• Molecular Weight: 110.13
• CAS Registry Number: 66-27-3
• EC Number: 200-625-0

Properties

• Density: 1.3
• Boiling point: 202-203 °C
• Refractive index: 1.413-1.415
• Flash point: 104 °C
• Water solubility: 200 g/L (20 °C)

Safety Data

• Hazard Symbols: T
• Risk Statements: R22;R36/37/38;R45;R68
• Safety Statements: S26;S36/37/39;S45;S53

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Acute toxicity	Acute Tox.	3	H301
Skin irritation	Skin Irrit.	2	H315
Eye irritation	Eye Irrit.	2	H319
Germ cell mutagenicity	Muta.	1B	H340
Reproductive toxicity	Repr.	2	H361
Skin sensitization	Skin Sens.	1	H317
Carcinogenicity	Carc.	2	H351
Specific target organ toxicity - repeated exposure	STOT RE	2	H373
Chronic hazardous to the aquatic environment	Aquatic Chronic	2	H411
Carcinogenicity	Carc.	1B	H350
Specific target organ toxicity - single exposure	STOT SE	3	H335
Germ cell mutagenicity	Muta.	2	H341
Eye irritation	Eye Irrit.	2A	H319
Carcinogenicity	Carc.	1A	H350
Acute toxicity	Acute Tox.	4	H302

• Transport Information: UN 2810