What is Methanesulfonic Acid and how is it identified?

Methanesulfonic acid, also called MSA or methylsulfonic acid, is a strong organic sulfonic acid with CAS 75-75-2, molecular formula CH₄O₃S and molecular weight 96.11. Its EINECS number is 200-898-6.

Which specifications matter when purchasing Methanesulfonic Acid?

Confirm assay, color, water content, chloride, sulfate, iron and heavy-metal levels. Low-chloride and low-metal grades are especially important for electroplating, electronics and pharmaceutical or sensitive organic synthesis.

What is the difference between 70% and 99% Methanesulfonic Acid?

MSA 70% is an aqueous solution commonly used in electroplating and industrial cleaning, while MSA 99% is a high-purity grade used for pharmaceutical synthesis, sensitive organic reactions and applications that require very low water and metal levels.

What is Methanesulfonic Acid used for?

It is used as an acid catalyst in esterification, alkylation, polymerization and organic synthesis, and as an electrolyte or additive in electroplating and electronics processing. It also serves as an intermediate or processing aid in pharmaceuticals, agrochemicals, cleaning and water treatment.

Methanesulfonic Acid CAS 75-75-2

Methanesulfonic Acid (MSA), CAS 75-75-2, is a strong organic sulfonic acid used in electroplating and as an acid catalyst. Confirm the required concentration, purity and impurity levels for the intended process.

CAS: 75-75-2
Synonyms: Mesic acid, MSA, Methylsulfonic acid, Methanesulphonic acid, Methansulfonic acid
Einecs: 200-898-6
Molecular Formula: CH₄O₃S
Grade: Industrial grade 99%
Package: 200kg iron drum or 50kg plastic drum packing

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Product Description

Methanesulfonic Acid (MSA), CAS 75-75-2, is a strong organic sulfonic acid also named methylsulfonic acid; the EC/EINECS number is 200-898-6.

Synonyms: Mesic acid; MSA; Methylsulfonic acid; Methanesulphonic acid; Methansulfonic acid.

CAS: 75-75-2.

Molecular formula: CH₄O₃S.

Molecular weight: 96.11.

EC number: 200-898-6.

It is a clear, colorless to pale-yellow liquid that is miscible with water.

Typical properties include melting point about 20 °C, boiling point about 167 °C at 1.33 kPa, flash point about 189 °C, and relative density about 1.48. Low-chloride (below 10 ppm) and low-metal grades are available for electronics plating.

It is widely used as an electrolyte and additive in tin, solder and other metal electroplating, where it enables uniform metal deposition and reduces insoluble salt formation.

It is also used as an acid catalyst in esterification, alkylation and polymerization, and as an intermediate or processing aid in pharmaceuticals, agrochemicals, cleaning and water treatment.

Confirm assay, color, water content, chloride, sulfate, iron and heavy-metal levels; low-chloride and low-metal grades are important for electroplating, electronics and pharmaceutical or sensitive organic synthesis.

Store in tightly closed, corrosion-resistant containers in a cool, dry, ventilated area away from strong oxidizers, alkalis, heat and ignition sources. Use acid-resistant PPE because concentrated MSA is corrosive.

Confirm the current product-specific specification.

Confirm packaging with the requested quantity and destination requirements.

Document requirements should be confirmed from the current specification, SDS, COA, or other product-specific files.

Regulated-use suitability must be confirmed separately with current product-specific documentation.

The page is an RFQ entry point and does not state stock, price, MOQ, or fixed lead time.

For an RFQ, state the intended use, required specification, quantity, packaging, destination, and document needs.

FAQ - Technical & Supply Chain

Q:
What is Methanesulfonic Acid and how is it identified?

A: Methanesulfonic acid, also called MSA or methylsulfonic acid, is a strong organic sulfonic acid with CAS 75-75-2, molecular formula CH₄O₃S and molecular weight 96.11. Its EINECS number is 200-898-6.
Q:
Which specifications matter when purchasing Methanesulfonic Acid?

A: Confirm assay, color, water content, chloride, sulfate, iron and heavy-metal levels. Low-chloride and low-metal grades are especially important for electroplating, electronics and pharmaceutical or sensitive organic synthesis.
Q:
What is the difference between 70% and 99% Methanesulfonic Acid?

A: MSA 70% is an aqueous solution commonly used in electroplating and industrial cleaning, while MSA 99% is a high-purity grade used for pharmaceutical synthesis, sensitive organic reactions and applications that require very low water and metal levels.
Q:
What is Methanesulfonic Acid used for?

A: It is used as an acid catalyst in esterification, alkylation, polymerization and organic synthesis, and as an electrolyte or additive in electroplating and electronics processing. It also serves as an intermediate or processing aid in pharmaceuticals, agrochemicals, cleaning and water treatment.
Q:
How should Methanesulfonic Acid be stored and handled?

A: Store in tightly closed, corrosion-resistant containers in a cool, dry, ventilated area away from strong oxidizers, alkalis, heat and ignition sources. Use acid-resistant PPE and avoid direct skin or eye contact because concentrated MSA is corrosive.

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