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Acid, base and phase-transfer catalysts

Methanesulfonic acid

Also known as Methylsulfonic acid, Methanesulphonic acid, Kyselina methansulfonova

CAS 75-75-2Formula CH4O3SMolar mass 96.11 g/molEC 200-898-6
GHS signal word: Danger. Pictograms: Corrosive 157 suppliers listed
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Methanesulfonic acid chemical structure, CH4O3S, CAS 75-75-2
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Solid
Melting point
20 °C
Boiling point
167 °C
Density
1.4812 g/cm³ at 18 °C
Flash point
189 °C
HS code
290410
Category
Acid, base and phase-transfer catalysts
Illustrative photo, a shrink wrapped pallet of kraft paper sacks in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is Methanesulfonic acid?

Plain description, key identifiers and synonyms

Methanesulfonic acid is an alkanesulfonic acid in which the alkyl group directly linked to the sulfo functionality is methyl. It has a role as an Escherichia coli metabolite. It is an alkanesulfonic acid and a one-carbon compound. It is a conjugate acid of a methanesulfonate.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
methanesulfonic acid
CAS number
75-75-2 CAS number cross-checked
EC number
200-898-6
Molecular formula
CH4O3S
UNII
12EH9M7279
MDL number
MFCD00007518
InChIKey
AFVFQIVMOAPDHO-UHFFFAOYSA-N
InChI
InChI=1S/CH4O3S/c1-5(2,3)4/h1H3,(H,2,3,4)
SMILES (canonical and isomeric)
CS(=O)(=O)O

Synonyms

  • Methylsulfonic acid
  • Methanesulphonic acid
  • Kyselina methansulfonova
  • Mesylate
  • Mesylic acid
  • Sulfomethane
  • MsOH
  • Methansulfonsaeure
  • MSA
  • Methanesulfonicacid
  • Methane sulfonic acid
  • Alkanesulfonate
  • metanesulfonic acid
  • methansulfonic acid
  • Aliphatic sulfonate
  • methansulphonic acid
  • methylsulphonic acid
  • methyl sulfonic acid
  • methyl-sulfonic acid
  • methane-sulfonic acid
  • MeSO3H
  • methane sulphonic acid
  • methanesulphonic-acid-
  • Lactic acid(dl)
  • 4-04-00-00010 (Beilstein Handbook Reference)
Show all 34 synonyms
  • Methanesulfonic acid, 99.5%
  • Methanesulfonic acid, anhydrous
  • Methanesulfonic Acid (CH3SO3H)
  • Methanesulfonic acid, HPLC grade
  • Methanesulfonic acid, >=99.0%
  • Methanesulfonic acid pound MSA pound(c)
  • Methanesulfonic acid, 70% soln
  • Methanesulfonic acid - 70% aqueous solution
  • Methanesulfonic acid (70% solution in water)

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Solidexp.
Melting point
20 °Cexp.
Boiling point
167 °Cexp.
Density
1.4812 g/cm³ at 18 °Cexp.
Flash point
189 °Cexp.
Autoignition temperature
>500exp.
Solubility
Soluble in waterexp.
Vapour pressure
4.28 × 10⁻⁴ mm Hg at 25 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
96.11 g/molcalc.
Exact mass
95.9881 Dacalc.
LogP (octanol/water)
-0.5calc.
Topological polar surface area
54.37 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
0calc.
Heavy atoms
5calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
1calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS05: Corrosive
Corrosive

Hazard statements

  • H314Causes severe skin burns and eye damage.
Precautionary statements (12)
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P330 + P331If swallowed: Rinse mouth. Do not induce vomiting.
  • P302 + P361 + P354If on skin: Take off immediately all contaminated clothing. Immediately rinse with water for several minutes.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P316Get emergency medical help immediately.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P363Wash contaminated clothing before reuse.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Methanesulfonic acid suppliers

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All 157 suppliers
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Where suppliers are based

157 suppliers in 27 countries

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Methanesulfonic acid price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Chem int to form secondary methane sulfonates from olefins, chem int for trifluoromethane sulfonic acid, methane sulfonyl chloride.

Catalyst in esterification, alkylation, olefin polymerization, peroxidation reactions.

The anhydrous acid is ... useful as a solvent.

Industrial uses: Etching agent, Chelating agent, Intermediate, Catalyst, Processing aids not otherwise specified, Plating agent, pH regulating agent.

Use classes: Processing Aids and Additives, Safer Chemical Classes.

Roles

  • Escherichia coli metabolite
  • bacterial metabolite
  • metabolite
  • prokaryotic metabolite

Functional uses

  • Processing aids not otherwise specified

How it is made

Oxidation of methyl mercaptan

Prepared from sulfur trioxide and methane, ... by oxidn of dimethyl disulfide.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 607-145-00-4

United States

  • Safer Choice ingredient list (USA)
  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Methanesulfonic acid is traded under.

HS 2904.10Indicative HS code

Derivatives containing only sulpho groups, their salts and ethyl esters

World exports in 2024
$447M
−5.5% vs 2023, imports $498M
2019 to 2024
Top exporters
  1. Germany21.1%
  2. China15.2%
  3. United States11.5%
Top importers
  1. United States8.5%
  2. China8.4%
  3. Sweden6.8%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Methanesulfonic acid is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Methanesulfonic acid, based on the data on this page

What is Methanesulfonic acid?

Methanesulfonic acid is an alkanesulfonic acid in which the alkyl group directly linked to the sulfo functionality is methyl. It has a role as an Escherichia coli metabolite. It is an alkanesulfonic acid and a one-carbon compound. It is a conjugate acid of a methanesulfonate.

What is the CAS number of Methanesulfonic acid?

The CAS registry number of Methanesulfonic acid is 75-75-2.

What is the molecular formula and weight of Methanesulfonic acid?

The molecular formula of Methanesulfonic acid is CH4O3S and its molar mass is 96.11 g/mol.

What is Methanesulfonic acid used for?

Chem int to form secondary methane sulfonates from olefins, chem int for trifluoromethane sulfonic acid, methane sulfonyl chloride. Catalyst in esterification, alkylation, olefin polymerization, peroxidation reactions. The anhydrous acid is ... useful as a solvent.

Is Methanesulfonic acid hazardous?

Methanesulfonic acid carries the GHS signal word "Danger". Main hazards: causes severe skin burns and eye damage. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Methanesulfonic acid?

Methanesulfonic acid is usually classified under HS code 290410 (Derivatives containing only sulpho groups, their salts and ethyl esters). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Methanesulfonic acid?

CompoundList lists 157 suppliers of Methanesulfonic acid in China, United States, India, Germany and 23 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Methanesulfonic acid in India?

27 suppliers in India list Methanesulfonic acid on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Methanesulfonic acid?

Suppliers quote Methanesulfonic acid on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Methanesulfonic acid

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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