Electro Plating, High-Purity Solvents

Sodium Sulfopropyl Disulfide

Sodium Sulfopropyl Disulfide, commonly referred to as SPS within the electroplating industry, is a specialized organosulfur compound represented by the chemical formula C6H12Na2O6S4. This white to yellowish crystalline solid acts as a critical brightener and leveling agent, primarily utilized in the acid copper plating processes. As a water-soluble surfactant, SPS significantly enhances the electrolytic deposition of copper on various substrates, ensuring a uniform, high-luster finish. Its unique molecular structure, featuring a disulfide bridge and terminal sulfonic acid groups, allows it to interact effectively with copper ions at the cathode interface. By modifying the grain structure during electrodeposition, it prevents the formation of rough surfaces or dendritic growth. This substance is indispensable in the manufacturing of high-density interconnect printed circuit boards and decorative metal finishing. Due to its stability and performance consistency, SPS remains a cornerstone additive for achieving superior physical properties and aesthetic quality in modern industrial electrochemical applications worldwide.

Attributes

Key Features and Benefits

High Water Solubility: Ensures rapid and complete dissolution in acidic plating baths without residue.
Exceptional Brightening Power: Produces mirror-like finishes by refining the grain size of deposited copper.
Superior Leveling Ability: Effectively fills micro-vias and trenches in complex electronic components.
Process Stability: Maintains performance over a wide range of current densities and temperatures.
Synergistic Compatibility: Works efficiently with carrier agents and surfactants to optimize electrodeposition.
Reduced Defect Rates: Minimizes surface roughness and pitting, leading to higher yields in industrial manufacturing processes.
Longevity: Demonstrates excellent chemical stability under harsh electrolytic conditions for long-term usage.

Specifications

Technical Highlights

CAS Number: 27206-35-5 provides clear regulatory identification for global chemical compliance and safety.
Chemical Formula: C6H12Na2O6S4 indicates a symmetric disulfide structure with terminal sodium sulfonate functional groups.
Purity Standards: Typically available at levels exceeding 90-95% to ensure predictable performance in sensitive baths.
Molar Mass: Approximately 354.39 g/mol, influencing its diffusion kinetics during the electroplating process.
pH Compatibility: Specifically formulated for optimal activity within low pH sulfuric acid electrolytic systems.
Decomposition Profile: High thermal stability prevents premature breakdown during continuous plating cycles.
Electrochemical Potential: Functions by adsorbing onto the cathode, creating a polarization effect.

Download Technical Data Sheet (TDS)

Practical industry uses

Applications

Printed Circuit Boards (PCB): Essential for through-hole plating and micro-via filling in high-density electronics.
Decorative Plating: Used in automotive and consumer hardware industries to achieve brilliant, high-gloss copper coatings.
Semiconductor Manufacturing: Provides precise copper deposition required for integrated circuit interconnects and advanced packaging.
Industrial Electroforming: Facilitates the creation of complex metallic shapes with high dimensional accuracy and smoothness.
Rotogravure Cylinders: Applied in the printing industry to ensure hard, uniform copper layers on engraved rollers.
Metal Finishing: Serves as a primary additive in functional copper plating for aerospace and defense components requiring high structural integrity.