Electro Plating, High-Purity Solvents

Sodium 3-Mercapto-1-Propanesulfonate (MPS)

Sodium 3-Mercapto-1-Propanesulfonate (MPS), identified by CAS number 17636-10-1, is a vital organosulfur compound utilized extensively in the field of electroplating and metal surface finishing. This white to off-white crystalline powder is highly soluble in water and functions primarily as a grain refiner and brightener in acid copper plating baths. By providing a thiol group and a sulfonate group within its molecular structure, MPS effectively regulates the deposition rate of metal ions, ensuring a uniform and lustrous finish on various substrates. Beyond its application in decorative plating, it plays a critical role in the manufacturing of printed circuit boards and electronic components where precision and conductivity are paramount. Its chemical stability under acidic conditions makes it an indispensable additive for modern electrolytic processes. As a versatile functional monomer, MPS also finds utility in research and specialized chemical synthesis, where its unique sulfur-containing structure facilitates the creation of advanced polymers and reagents.

Attributes

Key Features and Benefits

High Purity: Offers superior electrochemical performance in sensitive acid copper plating formulations for microelectronics.
Excellent Solubility: Rapidly dissolves in aqueous systems, ensuring ease of bath maintenance and consistency.
Brightening Efficiency: Acts as a powerful leveler, significantly improving the surface brightness and smoothness of deposited copper.
Grain Refinement: Promotes the formation of fine-grained structures, enhancing the mechanical properties and ductility of the finish.
Chemical Compatibility: Exhibits high stability in acidic environments, preventing degradation and extending the life of electrolyte solutions.
Precision Control: Facilitates the uniform deposition of metals in complex high-aspect-ratio blind vias and trenches, optimizing electronic interconnect integrity and performance.

Specifications

Technical Highlights

Molecular Formula: C3H7NaO3S2, providing a bifunctional structure with both mercapto and sulfonate moieties.
Appearance: Uniform white crystalline solid with low moisture content to ensure consistent molar concentration in plating baths.
Functional Activity: Thiol group (-SH) interacts directly with copper ions to regulate crystallization speed and surface morphology.
Electrochemical Potency: Effectively shifts the cathodic polarization curve, enabling better control over plating distribution and layer thickness.
Thermal Stability: Remains stable during standard storage and handling temperatures without losing functional group activity.
Aqueous Solubility: Miscible in water and typical mineral acids, allowing for seamless integration into diverse electrolytic bath chemistries and process workflows.

Download Technical Data Sheet (TDS)

Practical industry uses

Applications

Acid Copper Plating: Essential brightener for electroplating decorative and functional copper layers on plastic and metal substrates.
PCB Manufacturing: Widely used in through-hole plating and blind via filling for advanced printed circuit boards.
Semiconductor Packaging: Critical additive for electrodepositing interconnects in high-density integration and wafer-level packaging processes.
Metal Finishing: Employed in the automotive industry for high-quality chrome and copper plating of exterior trim components.
Organic Synthesis: Serves as a versatile intermediate for introducing propanesulfonate and thiol groups into complex organic molecules.
Research: Utilized in surface science studies to modify electrode surfaces and create self-assembled monolayers for analytical and sensor applications.