Sodium Sulfide Yellow Flake (Na₂S) 1313-82-2

Sodium Sulfide Yellow Flake is a yellow to light amber crystalline flake with 60% Na₂S purity and a molecular weight of 78.04 g/mol. It is a more refined grade of sodium sulfide with lower iron content than red flake, making it the preferred choice for textile dyeing and applications where color quality or metal ion sensitivity is important.

Yellow flake sodium sulfide is more refined with lower iron content, giving it a lighter yellow color. Red flake contains trace iron impurities that give it a reddish-brown color. Both grades contain approximately 60% Na₂S. Yellow flake is preferred for textile sulfur dyeing where cleaner color shades are required. Red flake is the more economical standard choice for leather processing and mining where iron content does not affect performance.

In textile sulfur dyeing, sodium sulfide acts as a reducing agent to convert insoluble sulfur dyes into their water-soluble leuco form. The lower iron content in yellow flake prevents iron contamination that could cause dull or inconsistent dye shades. This results in brighter, more uniform colors, which is critical for textile quality control.

Yes, yellow flake sodium sulfide performs effectively in leather dehairing and copper mining flotation, offering the same chemical functionality as red flake. It is sometimes preferred for processing lighter-colored hides in leather production where red iron staining is undesirable. For mining flotation, both grades perform comparably, and the choice between red and yellow flake is primarily based on cost and availability.

Sodium sulfide yellow flake is corrosive and releases toxic hydrogen sulfide gas when in contact with acids. It is hygroscopic and will absorb moisture from air. Store in a cool, dry, well-ventilated area in tightly sealed containers away from acids and moisture. Use appropriate PPE including chemical-resistant gloves, goggles, and respiratory protection. Keep solutions alkaline to minimize H₂S release.