
Sodium pyrithione with the molecular formula C5H4NNaOS, is a white to off-white crystalline powder; the industrial grade product has a slight yellowish tint. It is stable at room temperature, readily soluble in water and ethanol, and possesses excellent broad-spectrum antibacterial, antifungal, and preservative properties. It is primarily used as a preservative in personal care and cosmetic products, a mold inhibitor in coatings and emulsion paints, a biocide in industrial recirculating water systems, an antimicrobial additive in textiles and leather, and a preservative ingredient in personal care and laundry products.
| Item | Specification |
| Melting point | -25°C |
| Boiling Point | 109°C |
| Density | 1.22 g/cm³ (25°C) |
| Flash point | 107.3°C |
| Vapor pressure | <0.01 mmHg (25°C) |
| Refractive Index | 1.4825 |
| Solubility | Water > 500 g/L, Ethanol > 150 g/L, Polyethylene Glycol > 100 g/L (25°C) |
| Stability | Tends to yellow upon exposure to light or heat; avoid contact with strong oxidizing agents and heavy metal salts. |
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