Molekula
Methanesulfonic acid 99.5% min.
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 (MSA) is a strong organic acid widely used as a catalyst in organic synthesis, battery electrolyte formulation, and pharmaceutical manufacturing due to its high purity and stability. It also serves as a chemical intermediate for methanesulfonyl chloride and trifluoromethanesulfonic acid, as a solvent, and in metal plating, electrolytic finishing and printed circuit board manufacturing. It is also employed in laboratory settings for its non-oxidizing and non-volatile properties. This product has a minimum purity of 99.5%, with a CAS number of 75-75-2, molecular formula CH3SO3H, and a molecular weight of 96.11. It should be stored at ambient temperatures and handled with caution, as it carries a "Danger" signal word. Molekula supplies Methanesulfonic acid 99.5% min. 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
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
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, Colourless to light yellowish odourless liquid. (below 20°C/68°F material is solid.) |
| Colour (Pt-Co) | ≤150 |
| Assay | ≥99.5% |
| Total chlorine | ≤10 mg/kg |
| Sulphates (SO4)(2-) | ≤50 mg/kg |
| Metal Content | ≤1.0mg/kg |
| Content of oxidizable components | ≤5 mg/kg |
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 | 90032771 |
| 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
-
Corrosive
GHS05
-
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, Russian, 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 (99.5% min) commonly used for?
Methanesulfonic acid is widely used as a strong acid catalyst in organic synthesis, pharmaceuticals, and as an aqueous electrolyte in redox flow batteries such as soluble-lead and zinc-cerium systems.
What is the chemical formula and molecular weight of methanesulfonic acid?
The chemical formula is CH₃SO₃H, and the molecular weight is 96.11 g/mol.
How should methanesulfonic acid be stored?
Store at ambient temperature in a tightly sealed container, away from incompatible materials like strong oxidizers and bases.
What purity grades of methanesulfonic acid does Molekula offer?
Molekula supplies methanesulfonic acid at a minimum purity of 99.5%, suitable for most industrial and research applications.
Can Molekula supply methanesulfonic acid in bulk quantities?
Yes, we offer bulk packaging options—please contact our sales team for specific quantities and logistics details.
What documentation is provided with a methanesulfonic acid order?
Each order includes a Certificate of Analysis (CoA), Material Safety Data Sheet (MSDS), and a compliance certificate for purity and hazard classification.
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.