Bis-(sodium sulfopropyl)-disulfide CAS 27206-35-5

Description

Bis-(sodium sulfopropyl)-disulfide, CAS 27206-35-5, commonly known as SPS, is an organosulfur compound supplied as a white to light yellow powder or crystalline solid. It is highly valued in industrial applications, particularly as a key additive in electroplating solutions. Its chemical structure allows it to influence the deposition process of metals, leading to improved coating characteristics.

Properties

Property	Value
CAS Number	27206-35-5
Chemical Name	Bis-(sodium sulfopropyl)-disulfide
Common Abbreviation	SPS
Alternate Names	3,3′-Dithiobis-1-propanesulfonic acid, disodium salt
Molecular Formula	C6​H12​Na2​O6​S4​
Molecular Weight	Approximately $354.40\text{ g/mol}$
Appearance	White to light yellow powder or crystalline solid
Solubility	Soluble in water (e.g., $600\text{ g/L}$ at $25\text{ °C}$)
Storage Temperature	Often recommended at $-20\text{ °C}$ or cool, dry conditions, protected from moisture

Usage

Bis-(sodium sulfopropyl)-disulfide (SPS) is extensively used as a critical component in the electroplating industry, primarily as a brightener and grain refiner in acid copper plating baths. Its main functions include:

• Copper Electroplating: SPS significantly improves the quality of copper deposits by making them brighter, more level, and highly ductile. It is essential for both decorative finishes and functional coatings. For example, it is widely used in the manufacturing of printed circuit boards (PCBs) to ensure uniform and reliable copper traces. It is also employed in the production of high-quality, low-profile electrolytic copper foils used in electronic components and lithium-ion batteries.
• Additive Synergy: It is often used in conjunction with other additives, such as non-ionic surfactants, polymeric amines, and other sulfur-containing organic compounds (like DPS and MPS), to achieve optimal performance and specific deposit characteristics in copper electroplating solutions.

While electroplating is its primary application, it may also find use in other areas requiring its surfactant or reducing properties.

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