Methanesulfonic Acid
MSA, Methylsulfonic Acid.
- CAS
- 75-75-2
- EC
- 200-898-6
- Sectors
- Electronics & Solar PV, Home Care & Industrial Cleaning
Methanesulfonic Acid (CAS 75-75-2) is a non-oxidizing organic acid of the sulfonic acid class, supplied as a colorless or light yellow liquid solution, recognized for its biodegradability and lower environmental impact, and used as a catalyst in esterification and alkylation reactions and as an electrolyte in electroplating and battery applications. Compared to traditional mineral acids, MSA offers high thermal stability and superior solubility for metal salts. It is a highly efficient catalyst in esterification and alkylation reactions in chemical processing. This Technical Grade acid is non-fuming and easy to handle in industrial settings, reducing equipment corrosion. Its high ionic conductivity makes it a premier choice for electroplating and modern battery applications.
Typical Properties
| Molecular formula | CH4O3S |
|---|---|
| Molecular weight | 96.11 g/mol |
| Appearance | colourless or light yellow liquid |
| Form | Solution |
| Color | brown |
| Melting point | 20 °C |
| Boiling point | 167 °C @ Press: 10 Torr |
| Density | 1.4812 g/cm³ @ Temp: 18 °C |
| Flash point | >230 °F |
| GHS signal word | Danger · Corrosive, Acute toxicity, Irritant / harmful, Health hazard |
| HS code | 29041000 |
| Grades available | Technical Grade |
Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.
Methanesulfonic Acid
Applications
- Electroplating: Acts as a high-performance electrolyte for tin, lead, and precious metal plating in electronics.
- Industrial Cleaning: Used in scale removal and hard surface cleaners where high efficacy and low VOC are required.
- Chemical Synthesis: Serves as a catalyst for the production of esters, polymers, and pharmaceutical intermediates.
Safety & Risks
Strongly corrosive; classified as Skin Corrosion Category 1B. Mandatory use of acid-resistant aprons, face shields, and heavy-duty PVC gloves during transfer.
Packaging
30 kg jerrycans, 250 kg drums, or 1200 kg IBC tanks.