Industrial & Electroplating Grade Methanesulfonic Acid (MSA) CAS 75-75-2
Methanesulfonic Acid is a strong, non-oxidizing organic alkane sulfonic acid featuring an exceptionally low pKa. Characterized as a clear, colorless to light yellow oily liquid, MSA serves as an environmentally sustainable “green acid” replacement for hazardous mineral acids like sulfuric, hydrofluoric, and methanesulfonic-based solutions in industrial chemical processing.
- High Metal Salt Solubility: MSA metal salts (e.g., tin, lead, copper, silver, bismuth) display extreme aqueous solubility and stability, enabling high-current-density plating bath operations without precipitation.
- Eco-Friendly & Biodegradable: Easily readily biodegradable into water and sulfate ions with low aquatic toxicity, offering an ideal regulatory-compliant profile for industrial waste management.
- Non-Oxidizing Strong Acidity: Delivers catalytic efficacy comparable to sulfuric acid without causing undesirable side reactions like carbonization, oxidation, or sulfurous byproduct generation.
Methanesulfonic Acid Description
Name: Methanesulfonic Acid (MSA)
Synonyms: Methylsulfonic acid / Mesylic acid / Sulfomethane / Methanesulphonic acid
Grade: MSA 70% & MSA 99%
Molecular Formula: CH4O3S or CH3SO3H
Molecular Weight: 96.11
CAS NO.: 75-75-2
UN NO.: 3265
Density: 1.481 g/cm³
Boiling point: 167 ℃（10mmHg）
Melting point: 19 ℃
Appearance: Colorless to light yellow liquid
Solubility: Soluble
Properties: Colorless or light yellow oily liquid, solid at low temperatures. Soluble in water, alcohol, and ether, insoluble in alkanes, benzene, toluene, etc. Does not decompose in hot water or hot alkali solution, but is highly corrosive to metals such as iron, copper, and lead.
Package: 250kg/plastic drum or 30kg/plastic drum.
Storage: Store in a sealed, cool, ventilated warehouse, away from light. Keep away from fire and heat sources. Store and transport separately from oxidants and alkalis.
Safety protection: Classified as UN 3265 Class 8 Corrosive Liquid. Causes severe skin burns and serious eye damage. Inhalation of mists or vapors irritates respiratory tracts. Operators must wear full-face respirators, neoprene or nitrile protective chemical gloves, rubber boots, and acid-resistant protective suits. Emergency eyewash and safety shower stations must be installed adjacent to handling areas.
Hot tags: Anhydrous Methanesulfonic Acid(AMSA) / Scaleva MSA / E-Pure MSA / Lutropur MSA / MSA 70% / MSA 99%
Methanesulphonic acid Technical
| Item | Index | |
| Grade | MSA 70% | MSA 99% |
| Methanesulfonic acid % | 70±0.5 | 99±0.5 |
| Chromaticity (APHA) | ≤10 | ≤250 |
| Chloride ions (ppm) | ≤5 | ≤5 |
| Sulfate(ppm) | ≤50 | ≤50 |
| Oxidizable(ppm) | ≤20 | / |
| Iron ions (ppm) | ≤5 | ≤5 |
| Zn | ≤1PPm | ≤1PPm |
| Cu | ≤1PPm | ≤1PPm |
| Ni | ≤1PPm | ≤1PPm |
Mesylic acid Applications
Methanesulfonic Acid (MSA) is widely utilized across multiple advanced industrial sectors depending on concentration grades:
MSA 70% Grade Applications:
- Precision Electronic & Industrial Electroplating: Serves as an ideal electrolyte medium for pure tin, tin-lead, tin-copper, and nickel plating in PCB manufacturing, electronic connectors, lead-frame finishing, and continuous steel strip electro-tinning.
- Hard Surface Cleaning & Descaling: Applied in commercial scale-removal formulations, dairy processing equipment cleaning, and rust removal due to its high solubility for calcium, magnesium, and iron oxides without pitting metal alloys.
- Oilfield Exploration: Used as an acidizing fluid component for high-temperature deep oil and gas wells to dissolve carbonate formations with minimal pipe corrosion.
MSA 99% Anhydrous Grade Applications:
- Esterification & Organic Catalysis: Acts as a strong, non-oxidizing acid catalyst for esterification, alkylation, polymerization, and condensation reactions in biodiesel, plasticizers, and specialty resins.
- Pharmaceutical & Fine Chemical Synthesis: Utilized as an essential reagent, reaction solvent, and counter-ion in API (Active Pharmaceutical Ingredient) mesylate salt synthesis (e.g., Imatinib Mesylate).
