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| "Synonyms:Sodium methanedisulfonate Methanedisulfonic acid sodium salt Disodium methanedisulphonate Methanedisulphonic acid disodium salt Molecular Formula:CH5NaO6S2 Molecular Weight: 200.15 HS Code: 2904100000 Grade:0.98 Hazard Class:General Cargo" | |||||||||
5799-70-2
bosschem
5799-70-2
1. Product Overview
Methane disulphonic acid sodium salt — also called disodium methanedisulfonate (MDS-Na) — is the neutral disodium salt of methanedisulfonic acid (MDSA), a strong diprotic acid in which a single carbon bridge carries two sulfonic groups (−SO₃H). The salt is supplied as a white crystalline powder that dissolves freely in water to give a stable, essentially neutral solution.
The two sulfonate groups endow the molecule with high charge density, strong chelating and dispersing character, and excellent thermal and chemical stability. In its sodium salt form it is markedly easier and safer to handle than the free acid: non-corrosive, low odor, non-volatile, and simple to dose precisely in aqueous formulations. These properties make MDS-Na a versatile building block for electroplating electrolytes
A single salt, four core value propositions:
Electroplating:
● a fluorine-free electrolyte and additive for hard chromium, tin, tin-alloy and zinc–nickel plating;
Organic Synthesis & Catalysis:
● a stable sulfonic-acid source and precursor for sulfonated reagents and catalysts;
Metal Finishing & Specialty Chemicals:
● a water-soluble additive for surface treatment, cleaning and electrochemical processes.
2. Product Information (Quick Facts)
Item | Specification |
Chemical Name | Methanedisulfonic acid disodium salt (Disodium methanedisulfonate) |
Synonyms | MDS sodium salt; Methane disulphonic acid sodium salt; Disodium methylenedisulfonate; Methanedisulfonic acid, sodium salt (1:2) |
CAS No. | 5799-70-2 (parent acid: 503-40-2) |
EC No. (EINECS) | 611-606-5 |
MDL No. | MFCD00144750 |
Molecular Formula | CH₂Na₂O₆S₂ (NaO₃S–CH₂–SO₃Na) |
Molecular Weight | 220.13 g/mol |
HS Code | 2904.10 (sulphonated derivatives of hydrocarbons, salts; 8-digit code may vary by destination) |
Appearance | White crystalline powder |
Solubility | Freely soluble in water; practically insoluble in common organic solvents |
3. Chemical Structure & Forms
The molecule is built from one methylene bridge (CH₂) carrying two identical sulfonate groups — NaO₃S–CH₂–SO₃Na. Because both sulfonate groups are directly attached to the same carbon, the compound combines strong acidity (in the acid form), high thermal stability and resistance to oxidation, with a compact structure that gives it unusual chelating and dispersing behavior in metal-ion media.
The free acid (methanedisulfonic acid, CAS 503-40-2) is a strongly acidic white powder with a melting point of 107 – 109 °C. The disodium salt (CAS 5799-70-2) is its fully neutralized form: it dissolves faster, does not attack equipment or skin like the acid, and is the preferred form for customers who need an easy-to-dose, low-corrosion sulfonate source. Both forms are interchangeable at the chemistry level, and either can be supplied depending on the application.
4. Key Features & Benefits
● Dual sulfonate structure, high charge density: two −SO₃ groups per molecule give strong chelation and dispersion of metal ions in plating and treatment baths.
● Fluorine-free and environmentally friendly: replaces fluoroboric-acid and fluoride-based electrolyte systems, cutting equipment corrosion, waste treatment burden and environmental compliance cost.
● Excellent thermal and chemical stability: resists oxidation and decomposition in hot, strongly acidic or alkaline process conditions.
● Salt form, easy to handle: neutral, non-corrosive, low odor and freely water-soluble — simpler and safer than working with the free acid.
● Broad electrochemical window: supports high plating rates, wide current-density ranges and bright, uniform deposits in tin, alloy and hard-chromium baths.
5. Main Applications
5.1 Electroplating (Core Application)
MDS derivatives are the foundation of modern fluorine-free plating chemistry:
● Hard chromium plating: a primary additive that widens the operating window and improves deposit uniformity and crack control;
● Tin and tin-alloy plating: electrolyte component giving fast deposition, wide current-density range and bright, solderable coatings for electronics;
● Zinc–nickel and other alloy systems: stabilizes bath chemistry and improves alloy composition control;
● Fluoroborate replacement: a drop-in sulfonate alternative that avoids fluoride corrosion of plant and fluorinated waste streams.
5.2 Organic Synthesis & Catalysis
● Sulfonic-acid source: clean, non-volatile precursor for generating sulfonic acids, sulfonyl derivatives and esters in situ;
● Catalyst and reagent precursor: starting material for sulfonated catalysts, ion-exchange monomers and functional surfactants;
● Analytical and research reagent: well-characterized standard for sulfonate chemistry and method development.
5.3 Metal Finishing & Specialty Chemicals
● Surface treatment: water-soluble additive for pickling, brightening and pre-treatment of metal substrates;
● Electrochemical processes: electrolyte additive in electrowinning, electro-polishing and related systems;
● Dispersant and cleaner: sulfonate dispersing action in industrial cleaning and process-fluid formulations.
6. Packaging, Storage
Packaging (customizable):
● 25 kg fiber drum with PE liner (1 kg, 5 kg and 10 kg sample/inner packs on request);
● 500 kg – 1,000 kg FIBC for bulk orders;
● Moisture-barrier lining standard to protect the hygroscopic powder.
Storage:
● Keep in a cool, dry, well-ventilated area away from direct sunlight and heat;
● Keep containers tightly closed (hygroscopic — absorbs moisture from air);
● Avoid contact with strong oxidizers and incompatible bases/acids during storage;
● Recommended storage temperature 5 °C – 35 °C.
● Factory-direct supply: own production capacity, transparent pricing, no middleman markup;
● Stable quality: strict internal control, every batch tested, COA with every shipment;
● Flexible specifications: electroplating to pharmaceutical grade, custom assay and impurity limits, sample orders welcome;
● Export experience: familiar with sea/air shipping documentation for chemical commodities, complete paperwork support;
● Fast response: quotations and technical support (COA, application advice) within 24 hours; small trial orders accepted.
It is used mainly in electroplating as a fluorine-free electrolyte component and additive for hard chromium, tin, tin-alloy and zinc–nickel plating; in pharmaceutical and fine-chemical synthesis as a sulfonation building block and high-purity intermediate; and in organic synthesis as a stable sulfonic-acid source and catalyst precursor.
MSA (CAS 75-75-2) is a single-sulfonate acid, CH₃SO₃H, widely used in tin plating. Methanedisulfonic acid (CAS 503-40-2) carries two sulfonate groups on one carbon bridge, giving it higher charge density, stronger chelation of metal ions and different bath behavior — it is the preferred sulfonate for hard-chromium and special alloy systems. The sodium salt (CAS 5799-70-2) is the neutral, easy-to-handle form of MDS.
The free acid (CAS 503-40-2) is strongly acidic and corrosive, with a melting point of 107 – 109 °C. The disodium salt (CAS 5799-70-2) is fully neutralized: it dissolves freely in water, is non-corrosive and low odor, and is far easier to dose and store. Customers who need a low-corrosion sulfonate source should choose the salt; those running strongly acidic formulations may prefer the acid. Both can be supplied.
As a powder it has low acute toxicity, but dust may irritate the eyes and respiratory tract. Use dust masks, gloves and goggles, and avoid generating airborne dust. It is an industrial/technical chemical, not a food ingredient
