Molekula
Methanesulfonic acid
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Methanesulfonic acid is a strong organic acid used as a catalyst, solvent, and reagent in chemical synthesis, particularly in pharmaceuticals and fine chemicals. It is a colorless to pale yellow liquid with a pungent odor. CAS: 75-75-2, Molecular formula: CH3SO3H, Molecular weight: 96.11 g/mol. Stable at ambient storage conditions. Hazard classification includes signal word: Danger. Molekula supplies Methanesulfonic acid from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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25 g — £30.90 per pack ex VAT · £37.08 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Clear or faint yellow liquid |
| Colour (Pt-Co) | ≤50 |
| Chloride (Cl-) | ≤20ppm |
| Assay | ≥99% |
| Heavy Metals (Pb) | ≤5ppm |
| Iron (Fe) | ≤5ppm |
| Sulphates (SO4)(2-) | ≤50ppm |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Flash Point | 189 °C |
| Transport Class | 8 |
| Packing Group | II |
| Acidity | Acid |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Solid |
| Melting Point | 20 °C |
| Boiling Point | 167 °C at 10 mmHg |
| Density | 1.4812 g/cm³ at 18 °C |
| Water Solubility | 1000 g/L at 20 °C (Miscible) |
| Solubility (other solvents) | Soluble in alcohol, ether |
| Vapour Pressure | 4.28 × 10⁻⁴ mmHg at 25 °C |
| Refractive Index | 1.4317 |
| pKa | pKa = -1.86 |
Source: PubChem CID 6395 (HSDB)
Identification
| Property | Value |
|---|---|
| SKU | 90005055 |
| CAS Number | 75-75-2 |
| IUPAC Name | methanesulfonic acid |
| EC Number | 200-898-6 |
| Molecular Formula | CH3SO3H |
| Molecular Weight | 96.11 |
| Exact Mass | 95.9881 |
| SMILES | CS(=O)(=O)O |
| InChIKey | AFVFQIVMOAPDHO-UHFFFAOYSA-N |
| InChI | InChI=1S/CH4O3S/c1-5(2,3)4/h1H3,(H,2,3,4) |
| PubChem CID | 6395 |
| UN Number | UN3265 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 29041050 |
| Tariff Code | 2904100090 |
Safety & GHS
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Corrosive
GHS05
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Health Hazard
GHS07
Hazard statements
- H290 May be corrosive to metals
- H302+312 Harmful if swallowed or in contact with skin
- H314 (sub cat. 1B) Causes severe skin burns and eye damage
- H318 Causes serious eye damage
- H335 May cause respiratory irritation
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician
- P303+361 IF ON SKIN (or hair): Remove immediately all contaminated clothing. Rinse with water/shower
- P304+340 IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- Alkanesulfonate
- Kyselina methansulfonova
- Mesylate
- Mesylic acid
- Methanesulphonic acid
- Methansulfonsaeure
- Methylsulfonic acid
- MSA
- MsOH
- Sulfomethane
Frequently asked questions
What is methanesulfonic acid used for?
Methanesulfonic acid is commonly used as a catalyst in organic synthesis and as a proton source in various chemical reactions, including esterification and alkylation.
What is the chemical formula and molecular weight of methanesulfonic acid?
The formula is CH3SO3H and the molecular weight is 96.11 g/mol.
How should methanesulfonic acid be stored?
It should be stored at ambient temperature, away from moisture and incompatible materials, in a tightly sealed container.
What grade of methanesulfonic acid does Molekula supply?
Molekula supplies methanesulfonic acid in reagent grade, suitable for laboratory and industrial applications.
Can Molekula supply methanesulfonic acid in bulk?
Yes, Molekula can supply methanesulfonic acid in bulk quantities; please contact our sales team for volume pricing and delivery options.
What documentation comes with a purchase of methanesulfonic acid?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS), compliant with GHS standards.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.